{"id":5373,"date":"2021-07-09T01:24:24","date_gmt":"2021-07-08T17:24:24","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5373"},"modified":"2021-07-19T16:43:37","modified_gmt":"2021-07-19T08:43:37","slug":"%e5%92%8c%e7%9b%b8%e5%90%8c%e7%9a%84%e4%ba%8c%e5%85%83%e5%ad%90%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5373","title":{"rendered":"\u548c\u76f8\u540c\u7684\u4e8c\u5143\u5b50\u6570\u7ec4"},"content":{"rendered":"<div>\n<div class=\"css-aq7gwn-Container es0hbuf0\">\n<div class=\"css-1p32nvc-Row1 es0hbuf1\">\n<p class=\"css-18ck646-title-Title es0hbuf2\"><a href=\"https:\/\/leetcode-cn.com\/problems\/binary-subarrays-with-sum\/solution\/he-xiang-tong-de-er-yuan-zi-shu-zu-by-le-5caf\/\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"css-1o4ejbc-Row2 es0hbuf3\">\n<div class=\"css-fndr66-UsernameContainer e123u7vb0\"><span class=\"css-x7m7pv-NameWrap e123u7vb1\">\u529b\u6263\u5b98\u65b9\u9898\u89e3<\/span><span class=\"e123u7vb3 css-fmw0cr-ReputationLevelContainer-StyledReputationLevel ekys2oz0\"><span class=\"css-1vu7cyl-Level ekys2oz1\">L6<\/span><\/span><\/div>\n<p><span class=\"css-1407w2u-PublishDate es0hbuf5\">\u53d1\u5e03\u4e8e\u00a01 \u5929\u524d<\/span><span class=\"css-1o2blet-HitCount es0hbuf6\">27.8k<\/span><span class=\"es0hbuf7 css-1yn85z9-BasicTag-StyledTag e4dtce60\">\u5b98\u65b9<\/span><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/tag\/array\/\">\u6570\u7ec4<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/tag\/hash-table\/\">\u54c8\u5e0c\u8868<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/tag\/prefix-sum\/\">\u524d\u7f00\u548c<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/tag\/sliding-window\/\">\u6ed1\u52a8\u7a97\u53e3<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/c\/\">C<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/cpp\/\">C++<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/csharp\/\">C#<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/golang\/\">Go<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/java\/\">Java<\/a><a class=\"es0hbuf7 css-1ad4xj5-BasicTag-StyledTag e4dtce60\" href=\"https:\/\/leetcode-cn.com\/topic\/javascript\/\">JavaScript<\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"css-1jiyb8u-ContentContainer e1ak08xt0\">\n<div class=\"e1ak08xt1 css-jqi38w-StyledRenderedMarkdown\">\n<h4 id=\"\u65b9\u6cd5\u4e00\uff1a\u54c8\u5e0c\u8868\">\u65b9\u6cd5\u4e00\uff1a\u54c8\u5e0c\u8868<\/h4>\n<p><strong>\u601d\u8def\u53ca\u7b97\u6cd5<\/strong><\/p>\n<p>\u5047\u8bbe\u539f\u6570\u7ec4\u7684\u524d\u7f00\u548c\u6570\u7ec4\u4e3a\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{sum}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><\/span><\/span><\/span>\uff0c\u4e14\u5b50\u6570\u7ec4\u00a0<span class=\"katex\"><span class=\"katex-mathml\">(i,j]<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mopen\">(<\/span><span class=\"mord mathdefault\">i<\/span><span class=\"mpunct\">,<\/span><span class=\"mord mathdefault\">j<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span>\u00a0\u7684\u533a\u95f4\u548c\u4e3a\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{goal}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">goal<\/span><\/span><\/span><\/span><\/span>\uff0c\u90a3\u4e48\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{sum}[j]-\\textit{sum}[i]=\\textit{goal}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">j<\/span><span class=\"mclose\">]<\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">i<\/span><span class=\"mclose\">]<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">goal<\/span><\/span><\/span><\/span><\/span>\u3002\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u679a\u4e3e\u00a0<span class=\"katex\"><span class=\"katex-mathml\">j<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">j<\/span><\/span><\/span><\/span>\u00a0\uff0c\u6bcf\u6b21\u67e5\u8be2\u6ee1\u8db3\u8be5\u7b49\u5f0f\u7684\u00a0<span class=\"katex\"><span class=\"katex-mathml\">i<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">i<\/span><\/span><\/span><\/span>\u00a0\u7684\u6570\u91cf\u3002<\/p>\n<p>\u5177\u4f53\u5730\uff0c\u6211\u4eec\u7528\u54c8\u5e0c\u8868\u8bb0\u5f55\u6bcf\u4e00\u79cd\u524d\u7f00\u548c\u51fa\u73b0\u7684\u6b21\u6570\uff0c\u5047\u8bbe\u6211\u4eec\u5f53\u524d\u679a\u4e3e\u5230\u5143\u7d20\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{nums}[j]<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">nums<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">j<\/span><span class=\"mclose\">]<\/span><\/span><\/span><\/span>\uff0c\u6211\u4eec\u53ea\u9700\u8981\u67e5\u8be2\u54c8\u5e0c\u8868\u4e2d\u5143\u7d20\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{sum}[j]-\\textit{goal}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">j<\/span><span class=\"mclose\">]<\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">goal<\/span><\/span><\/span><\/span><\/span>\u00a0\u7684\u6570\u91cf\u5373\u53ef\uff0c\u8fd9\u4e9b\u5143\u7d20\u7684\u6570\u91cf\u5373\u5bf9\u5e94\u4e86\u4ee5\u5f53\u524d\u00a0<span class=\"katex\"><span class=\"katex-mathml\">j<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">j<\/span><\/span><\/span><\/span>\u00a0\u503c\u4e3a\u53f3\u8fb9\u754c\u7684\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u6570\u7ec4\u7684\u6570\u91cf\u3002\u6700\u540e\u8fd9\u4e9b\u5143\u7d20\u7684\u603b\u6570\u91cf\u5373\u4e3a\u6240\u6709\u548c\u4e3a\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{goal}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">goal<\/span><\/span><\/span><\/span><\/span>\u00a0\u7684\u5b50\u6570\u7ec4\u6570\u91cf\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9e\u65f6\u5730\u66f4\u65b0\u54c8\u5e0c\u8868\uff0c\u4ee5\u9632\u6b62\u51fa\u73b0\u00a0<span class=\"katex\"><span class=\"katex-mathml\">i \\geq j<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">i<\/span><span class=\"mrel\">\u2265<\/span><\/span><span class=\"base\"><span class=\"mord mathdefault\">j<\/span><\/span><\/span><\/span>\u00a0\u7684\u60c5\u51b5\u3002<\/p>\n<p><strong>\u4ee3\u7801<\/strong><\/p>\n<div class=\"css-hhbtqi\">\n<ul class=\"css-6wg17u\">\n<li><label for=\"group-1-0\">C++<\/label><\/li>\n<li><label for=\"group-1-6\">Java<\/label><\/li>\n<li><label for=\"group-1-12\">C#<\/label><\/li>\n<li><label for=\"group-1-18\">Golang<\/label><\/li>\n<li><label for=\"group-1-24\">JavaScript<\/label><\/li>\n<li><label for=\"group-1-30\">C<\/label><\/li>\n<\/ul>\n<pre><button class=\"md-btn-copy\" title=\"\u590d\u5236\u4ee3\u7801\"><i><\/i><\/button><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Solution<\/span> {<\/span>\r\n<span class=\"hljs-keyword\">public<\/span>:\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">int<\/span> <span class=\"hljs-title\">numSubarraysWithSum<\/span><span class=\"hljs-params\">(<span class=\"hljs-built_in\">vector<\/span>&lt;<span class=\"hljs-keyword\">int<\/span>&gt;&amp; nums, <span class=\"hljs-keyword\">int<\/span> goal)<\/span> <\/span>{\r\n        <span class=\"hljs-keyword\">int<\/span> sum = <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-built_in\">unordered_map<\/span>&lt;<span class=\"hljs-keyword\">int<\/span>, <span class=\"hljs-keyword\">int<\/span>&gt; cnt;\r\n        <span class=\"hljs-keyword\">int<\/span> ret = <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">auto<\/span>&amp; num : nums) {\r\n            cnt[sum]++;\r\n            sum += num;\r\n            ret += cnt[sum - goal];\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    }\r\n};\r\n<\/code><\/pre>\n<\/div>\n<p><strong>\u590d\u6742\u5ea6\u5206\u6790<\/strong><\/p>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<span class=\"katex\"><span class=\"katex-mathml\">O(n)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathdefault\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\uff0c\u5176\u4e2d\u00a0<span class=\"katex\"><span class=\"katex-mathml\">n<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">n<\/span><\/span><\/span><\/span>\u00a0\u4e3a\u7ed9\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u5bf9\u4e8e\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u6211\u4eec\u81f3\u591a\u53ea\u9700\u8981\u63d2\u5165\u5230\u54c8\u5e0c\u8868\u4e2d\u4e2d\u4e00\u6b21\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1a<span class=\"katex\"><span class=\"katex-mathml\">O(n)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathdefault\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\uff0c\u5176\u4e2d\u00a0<span class=\"katex\"><span class=\"katex-mathml\">n<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">n<\/span><\/span><\/span><\/span>\u00a0\u4e3a\u7ed9\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u54c8\u5e0c\u8868\u4e2d\u81f3\u591a\u53ea\u5b58\u50a8\u00a0<span class=\"katex\"><span class=\"katex-mathml\">O(n)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathdefault\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\u00a0\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ul>\n<h4 id=\"\u65b9\u6cd5\u4e8c\uff1a\u6ed1\u52a8\u7a97\u53e3\">\u65b9\u6cd5\u4e8c\uff1a\u6ed1\u52a8\u7a97\u53e3<\/h4>\n<p><strong>\u601d\u8def\u53ca\u7b97\u6cd5<\/strong><\/p>\n<p>\u6ce8\u610f\u5230\u5bf9\u4e8e\u65b9\u6cd5\u4e00\u4e2d\u6bcf\u4e00\u4e2a\u00a0<span class=\"katex\"><span class=\"katex-mathml\">j<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">j<\/span><\/span><\/span><\/span>\uff0c\u6ee1\u8db3\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{sum}[j]-\\textit{sum}[i]=\\textit{goal}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">j<\/span><span class=\"mclose\">]<\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">sum<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mord mathdefault\">i<\/span><span class=\"mclose\">]<\/span><span class=\"mrel\">=<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">goal<\/span><\/span><\/span><\/span><\/span>\u00a0\u7684\u00a0<span class=\"katex\"><span class=\"katex-mathml\">i<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">i<\/span><\/span><\/span><\/span>\u00a0\u603b\u662f\u843d\u5728\u4e00\u4e2a\u8fde\u7eed\u7684\u533a\u95f4\u4e2d\uff0c<span class=\"katex\"><span class=\"katex-mathml\">i<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">i<\/span><\/span><\/span><\/span>\u00a0\u503c\u53d6\u533a\u95f4\u4e2d\u6bcf\u4e00\u4e2a\u6570\u90fd\u6ee1\u8db3\u6761\u4ef6\u3002\u5e76\u4e14\u968f\u7740\u00a0<span class=\"katex\"><span class=\"katex-mathml\">j<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">j<\/span><\/span><\/span><\/span>\u00a0\u53f3\u79fb\uff0c\u5176\u5bf9\u5e94\u7684\u533a\u95f4\u7684\u5de6\u53f3\u7aef\u70b9\u4e5f\u5c06\u53f3\u79fb\uff0c\u8fd9\u6837\u6211\u4eec\u5373\u53ef\u4f7f\u7528\u6ed1\u52a8\u7a97\u53e3\u89e3\u51b3\u672c\u9898\u3002<\/p>\n<p>\u5177\u4f53\u5730\uff0c\u6211\u4eec\u4ee4\u6ed1\u52a8\u7a97\u53e3\u53f3\u8fb9\u754c\u4e3a\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{right}<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">right<\/span><\/span><\/span><\/span><\/span>\uff0c\u4f7f\u7528\u4e24\u4e2a\u5de6\u8fb9\u754c\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_1<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0\u548c\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_2<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0\u8868\u793a\u5de6\u533a\u95f4\u00a0<span class=\"katex\"><span class=\"katex-mathml\">[\\textit{left}_1,\\textit{left}_2)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mopen\">[<\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\uff0c\u6b64\u65f6\u6709\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_2-\\textit{left}_1<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mbin\">\u2212<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0\u4e2a\u533a\u95f4\u6ee1\u8db3\u6761\u4ef6\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6ce8\u610f\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_1 \\leq \\textit{left}_2 \\leq \\textit{right} + 1<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2264<\/span><\/span><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><span class=\"mrel\">\u2264<\/span><\/span><span class=\"base\"><span class=\"mord text\"><span class=\"mord textit\">right<\/span><\/span><span class=\"mbin\">+<\/span><\/span><span class=\"base\"><span class=\"mord\">1<\/span><\/span><\/span><\/span>\uff0c\u56e0\u6b64\u9700\u8981\u5728\u4ee3\u7801\u4e2d\u9650\u5236\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_1<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">1<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0\u548c\u00a0<span class=\"katex\"><span class=\"katex-mathml\">\\textit{left}_2<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord\"><span class=\"mord text\"><span class=\"mord textit\">left<\/span><\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><span class=\"vlist-s\">\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>\u00a0\u4e0d\u8d85\u51fa\u8303\u56f4\u3002<\/p>\n<p><strong>\u4ee3\u7801<\/strong><\/p>\n<div class=\"css-hhbtqi\">\n<ul class=\"css-6wg17u\">\n<li><label for=\"group-2-0\">C++<\/label><\/li>\n<li><label for=\"group-2-6\">Java<\/label><\/li>\n<li><label for=\"group-2-12\">C#<\/label><\/li>\n<li><label for=\"group-2-18\">Golang<\/label><\/li>\n<li><label for=\"group-2-24\">JavaScript<\/label><\/li>\n<li><label for=\"group-2-30\">C<\/label><\/li>\n<\/ul>\n<pre><button class=\"md-btn-copy\" title=\"\u590d\u5236\u4ee3\u7801\"><i><\/i><\/button><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Solution<\/span> {<\/span>\r\n<span class=\"hljs-keyword\">public<\/span>:\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">int<\/span> <span class=\"hljs-title\">numSubarraysWithSum<\/span><span class=\"hljs-params\">(<span class=\"hljs-built_in\">vector<\/span>&lt;<span class=\"hljs-keyword\">int<\/span>&gt;&amp; nums, <span class=\"hljs-keyword\">int<\/span> goal)<\/span> <\/span>{\r\n        <span class=\"hljs-keyword\">int<\/span> n = nums.size();\r\n        <span class=\"hljs-keyword\">int<\/span> left1 = <span class=\"hljs-number\">0<\/span>, left2 = <span class=\"hljs-number\">0<\/span>, right = <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-keyword\">int<\/span> sum1 = <span class=\"hljs-number\">0<\/span>, sum2 = <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-keyword\">int<\/span> ret = <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-keyword\">while<\/span> (right &lt; n) {\r\n            sum1 += nums[right];\r\n            <span class=\"hljs-keyword\">while<\/span> (left1 &lt;= right &amp;&amp; sum1 &gt; goal) {\r\n                sum1 -= nums[left1];\r\n                left1++;\r\n            }\r\n            sum2 += nums[right];\r\n            <span class=\"hljs-keyword\">while<\/span> (left2 &lt;= right &amp;&amp; sum2 &gt;= goal) {\r\n                sum2 -= nums[left2];\r\n                left2++;\r\n            }\r\n            ret += left2 - left1;\r\n            right++;\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    }\r\n};\r\n<\/code><\/pre>\n<\/div>\n<p><strong>\u590d\u6742\u5ea6\u5206\u6790<\/strong><\/p>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\uff1a<span class=\"katex\"><span class=\"katex-mathml\">O(n)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathdefault\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\uff0c\u5176\u4e2d\u00a0<span class=\"katex\"><span class=\"katex-mathml\">n<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">n<\/span><\/span><\/span><\/span>\u00a0\u4e3a\u7ed9\u5b9a\u6570\u7ec4\u7684\u957f\u5ea6\u3002\u6211\u4eec\u81f3\u591a\u53ea\u9700\u8981\u904d\u5386\u4e00\u6b21\u8be5\u6570\u7ec4\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1a<span class=\"katex\"><span class=\"katex-mathml\">O(1)<\/span><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathdefault\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span>\u3002\u6211\u4eec\u53ea\u9700\u8981\u5e38\u6570\u7684\u7a7a\u95f4\u4fdd\u5b58\u82e5\u5e72\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"css-vgv9yb-secondary-ContinueAndCopyRight ezv7z183\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 &nbsp; \u529b\u6263\u5b98\u65b9\u9898\u89e3L6<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[120],"class_list":["post-5373","post","type-post","status-publish","format-standard","hentry","tag-04-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=5373"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/5373\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=5373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=5373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=5373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}