Count Square

#include<iostream>
#include<iostream>
#include<map>
#include<vector>
using namespace std;
int main() {
    int h, v;
	ios_base::sync_with_stdio(false);
    while(cin >> h >> v) {
        vector H(h), V(v);
        for (int i = 0; i < h; i++)  cin >> H[i];
        for (int i = 0; i < v; i++)  cin >> V[i];
        vector difH, difV;
		map mapaH, mapaV;
        for (int i = 0; i + 1 < h; i++)
            for (int j = i + 1; j < h; j++)
                mapaH[H[j] - H[i]]++;
        for (int i = 0; i + 1 < v; i++)
            for (int j = i + 1; j < v; j++)
                mapaV[V[j] - V[i]]++;
        int ways = 0;
        map ::iterator it;
        for (it = mapaH.begin(); it != mapaH.end(); it++)
            ways += it->second * mapaV[it->first];
        cout << ways << endl;
    }
    return 0;
}