Submission #76990

#	Time	Username	Problem	Language	Result	Execution time	Memory
76990		farukkastamonuda	Star triangles (IZhO11_triangle)	C++14	100 / 100	186 ms	17020 KiB

triangle

#include <bits/stdc++.h>
#define li 300005
using namespace std;
int n,x[li],y[li];
long long int cev;
unordered_map<int,int> xx,yy;
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        scanf("%d %d",&x[i],&y[i]);
        xx[x[i]]++;
        yy[y[i]]++;
    }
    for(int i=1;i<=n;i++){
        cev+=1ll*(xx[x[i]]-1)*(yy[y[i]]-1);
    }
    printf("%lld\n",cev);
    return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
triangle.cpp:10:14: 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