C++ Multimap运用实例—查找元素

#include <map>
#include <iostream>
#include <algorithm>
#include <utility>

using namespace std;

int main()
{
    map<float, float> map1 = { {1,7},{2,8},{3,9},{4,8},{5,6},{6,1},{7,3} };
    
    auto posKey = map1.find(3.0);
    if (posKey != map1.end())
    {
        cout << "" << posKey->first << "  " << posKey->second << endl;
    }

    auto posVal = find_if(map1.begin(),map1.end(),
        [](const pair<float, float>& elem1) {
            return elem1.second == 3.0;
        });

    if (posVal != map1.end())
    {
        cout << posVal->first << "   " << posVal->second << "" << endl;
    }


    system("pause");
    return 0;
}