Submission #76848

#	Time	Username	Problem	Language	Result	Execution time	Memory
76848		win11905	Star triangles (IZhO11_triangle)	C++11	100 / 100	679 ms	39104 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

const int N = 3e5+5;

int n, X[N], Y[N];
map<int, int> x, y;

int main() {
    scanf("%d", &n);
    for(int i = 0; i < n; ++i) {
        scanf("%d %d", X+i, Y+i);
        x[X[i]]++, y[Y[i]]++;
    }
    long long sum = 0;
    for(int i = 0; i < n; ++i) 
        sum += 1ll * (x[X[i]] - 1) * (y[Y[i]] - 1);
    printf("%lld\n", sum);
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
triangle.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", X+i, Y+i);
         ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100