meet at midpoint.cc

#include <iostream>
#include <vector>
using namespace std;

struct p{
    int a;
    int b;
};

p mam(int x, vector<int>& v){
    int i=0, f=v.size()-1;
    p q;
    while (true){
        int S=v[i]+v[f];
        if (S==x){
            q.a=v[i];
            q.b=v[f];
            return q; 
        }
        if (S > x) f--;
        if (S < x) i++;
    }
}