C++ how to copy a map to a vector [duplicate]

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爱一瞬间的悲伤 2020-12-15 19:26

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自闭症患者 (楼主)

2020-12-15 19:50

This should do what you want:

#include 
#include 
#include 
#include 
#include 

using namespace std;

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

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

    vector > 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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