有哪些鲜为人知却又很好用的 STL 函数？

作者：默雨蛮荒
链接：https://www.zhihu.com/question/270085840/answer/352317215
来源：知乎
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数字转字符串：

string s = to_string( num);

字符串转数字:

int i = stoi( str);

long l = stol( str);

double d =stod( str);

……等

名称原型说明

stoi int stoi (const string& str, size_t* idx = 0, int base = 10);

int stoi (const wstring& str, size_t* idx = 0, int base = 10); Convert string to integer (function template )

stol long stol (const string& str, size_t* idx = 0, int base = 10);

long stol (const wstring& str, size_t* idx = 0, int base = 10); Convert string to long int (function template)

stoul unsigned long stoul (const string& str, size_t* idx = 0, int base = 10);

unsigned long stoul (const wstring& str, size_t* idx = 0, int base = 10); Convert string to unsigned integer (function template)

stoll long long stoll (const string& str, size_t* idx = 0, int base = 10);

long long stoll (const wstring& str, size_t* idx = 0, int base = 10); Convert string to long long (function template)

stoull unsigned long long stoull (const string& str, size_t* idx = 0, int base = 10);

unsigned long long stoull (const wstring& str, size_t* idx = 0, int base = 10); Convert string to unsigned long long (function template)

stof float stof (const string& str, size_t* idx = 0);

float stof (const wstring& str, size_t* idx = 0); Convert string to float (function template )

stod double stod (const string& str, size_t* idx = 0);

double stod (const wstring& str, size_t* idx = 0); Convert string to double (function template )

stold long double stold (const string& str, size_t* idx = 0);

long double stold (const wstring& str, size_t* idx = 0); Convert string to long double (function template)

可能不算鲜为人知吧……毕竟stl没几个……

inplace_merge，写分治的时候很好用

nth_element，写暴力的时候很好用

stable_sort，sort的时候可以少记录一维，虽然用了pair也就是两行的事……

make_heap，唔，我记得这个东西我只用过一次？