stdmin 元素

template <class ForwardIterator>
ForwardIterator min_element (ForwardIterator first, ForwardIterator last);

template <class ForwardIterator, class Compare>
ForwardIterator min_element (ForwardIterator first, ForwardIterator last,Compare comp);

效果

查詢範圍中的最小元素

引數

first -迭代指向範圍的開頭
last -迭代指向範圍 comp 的端部 -的函式指標或函式物件有兩個引數和返回真或假，指示引數是否小於引數 2.本功能不應該修改輸入

返回

迭代器到範圍中的最小元素

複雜

線性比一個元素的數量少。

例

#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>  //to use make_pair

using namespace std;

//function compare two pairs
bool pairLessThanFunction(const pair<string, int> &p1, const pair<string, int> &p2)
{
  return p1.second < p2.second;
}

int main(int argc, const char * argv[]) {
  
  vector<int> intVec {30,200,167,56,75,94,10,73,52,6,39,43};
  
  vector<pair<string, int>> pairVector = {make_pair("y", 25), make_pair("b", 2), make_pair("z", 26), make_pair("e", 5) };
  
  
  // default using < operator
  auto minInt = min_element(intVec.begin(), intVec.end());
  
  //Using pairLessThanFunction
  auto minPairFunction = min_element(pairVector.begin(), pairVector.end(), pairLessThanFunction);
  
  
  //print minimum of intVector
  cout << "min int from default: " << *minInt << endl;
  
  //print minimum of pairVector
  cout << "min pair from PairLessThanFunction: " << (*minPairFunction).second << endl;
  
  return 0;
}

輸出

min int from default: 6
min pair from PairLessThanFunction: 2