Submission #976426

#	Time	Username	Problem	Language	Result	Execution time	Memory
976426		vjudge1	Star triangles (IZhO11_triangle)	C++98	Compilation error	0 ms	0 KiB

triangle

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

int main() {
    cin.tie(0); ios::sync_with_stdio(false);
    int n;
    long long ans = 0;
    cin >> n;
    map<int, vector<int>> adjX;
    map<int, vector<int>> adjY;

    for (int i = 0, xi, yi; i < n; i++) {
        cin >> xi >> yi;
        adjX[xi].push_back(yi);
        adjY[yi].push_back(xi);
    }

    int numX;
    for (auto &[xi, adj] : adjX) {
        numX = adj.size() - 1;
        for (auto &yi : adj) {
            if (!adjY.contains(yi)) continue;
            ans += numX * (adjY[yi].size() - 1);
        }
    }
    cout << ans;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:21:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   21 |     for (auto &[xi, adj] : adjX) {
      |                ^
triangle.cpp:24:23: error: 'class std::map<int, std::vector<int> >' has no member named 'contains'
   24 |             if (!adjY.contains(yi)) continue;
      |                       ^~~~~~~~