Chemical Reactant

#include<stdio.h>
#include<map>
#include<vector>
using namespace std;

int main()
{
    int n,m;
    scanf("%d %d",&n,&m);
    map<vector<int> , int > mymap;
    for(int i = 1 ; i <= n ; i++){
        vector<int> temp(m);
        for(int j = 0 ; j < m ; j ++){
            scanf("%d",&temp[j]);
        }
        mymap.insert({temp,i});
    }
    vector<int> target(m);
    for(int i = 0 ; i < m ; i ++){
        scanf("%d",&target[i]);
    }
    std::map<vector <int> ,int>::iterator its = mymap.find(target) , its2;
    if(its != mymap.end()){
        printf("%d",its->second);
        return 0;
    }
    for(its = mymap.begin() ; its != mymap.end() ; advance(its,1)){
        vector<int> comp(m);
        for(int j = 0 ; j < m ; j++){
            comp[j] = target[j] - its->first[j];
        }
        if(mymap.count(comp)){
            its2 = mymap.find(comp);
            int x = its->second;
            int y = its2->second;
            if(x != y){
                if(x < y){
                    printf("%d %d",x,y);
                }else{
                    printf("%d %d",y,x);
                }
                //printf("%d %d",(x < y ? x : y),(x > y ? x : y));
                return 0;
            }
        }
    }
    printf("NO");
    return 0;
}