C ++如何将地图复制到矢量 [英] C++ how to copy a map to a vector

问题描述

C ++中将对从地图复制到向量的最好方法是什么？

What's the best way in C++ to copy a pair from a map to vector? I'm doing this so I can subsequently sort the vector.

推荐答案

这应该可以做你想要的：

This should do what you want:

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <iterator>

using namespace std;

bool cmp(const pair<int, int>  &p1, const pair<int, int> &p2)
{
    return p1.second < p2.second;
}

int main()
{
    map<int, int> m;
    for(int i = 0; i < 10; ++i)
        m[i] = i * -i;

    vector<pair<int, int> > v;
    copy(m.begin(), m.end(), back_inserter(v));

    sort(v.begin(), v.end(), cmp);

    for(int i = 0; i < v.size(); ++i)
        cout << v[i].first << " : " << v[i].second << endl;
    return 0;
}

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