Submission #607019

#	Time	Username	Problem	Language	Result	Execution time	Memory
607019		1bin	Count Squares (CEOI19_countsquares)	C++14	100 / 100	2235 ms	105736 KiB

countsquares

    #include <bits/stdc++.h>

using namespace std;

#define all(v) v.begin(), v.end()
typedef long long ll;
const int NMAX = 2e3 + 5;
int n, m, a[NMAX], b[NMAX];
map<int, int> mp;

int main(void){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    cin >> n >> m;
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0; i < m; i++) cin >> b[i];
    for(int i = 0; i < n; i++)
        for(int j = i + 1; j < n; j++) mp[a[j] - a[i]]++;
    ll ans = 0;
    for(int i = 0; i < m; i++)
        for(int j = i + 1; j < m; j++) ans += mp[b[j] - b[i]];
    cout << ans;
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 40 / 40
• Subtask 3: 53 / 53