Submission #546318

#	Time	Username	Problem	Language	Result	Execution time	Memory
546318		krit3379	Star triangles (IZhO11_triangle)	C++17	100 / 100	388 ms	13204 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define N 300005

int x[N],y[N];
long long ans;
map<int,long long> mpx,mpy;

int main(){
    int n,i;
    scanf("%d",&n);
    for(i=1;i<=n;i++){
        scanf("%d %d",&x[i],&y[i]);
        mpx[x[i]]++;
        mpy[y[i]]++;
    }
    for(i=1;i<=n;i++){
        ans+=(mpx[x[i]]-1)*(mpy[y[i]]-1);
    }
    printf("%lld",ans);
    return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
triangle.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         scanf("%d %d",&x[i],&y[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100