Submission #413427

#	Time	Username	Problem	Language	Result	Execution time	Memory
413427		aris12345678	Star triangles (IZhO11_triangle)	C++14	100 / 100	396 ms	12164 KiB

triangle

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

const int mxN = 300005;
int x[mxN], y[mxN];

int main() {
    int n;
    scanf("%d", &n);
    map<int, int> x_axis, y_axis;
    for(int i = 0; i < n; i++) {
        scanf("%d %d", &x[i], &y[i]);
        x_axis[x[i]]++;
        y_axis[y[i]]++;
    }
    long long ans = 0;
    for(int i = 0; i < n; i++) {
        ans += (x_axis[x[i]]-1)*(y_axis[y[i]]-1);
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:20:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   20 |     printf("%d\n", ans);
      |             ~^     ~~~
      |              |     |
      |              int   long long int
      |             %lld
triangle.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
triangle.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         scanf("%d %d", &x[i], &y[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100