Submission #87666

#	Time	Username	Problem	Language	Result	Execution time	Memory
87666		thebes	Star triangles (IZhO11_triangle)	C++14	100 / 100	547 ms	22784 KiB

triangle

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

const int MN = 3e5+5;
map<int,int> x, y;
pair<int,int> p[MN];
int N, i; long long ans;

int main(){
        for(scanf("%d",&N),i=1;i<=N;i++){
                scanf("%d%d",&p[i].first,&p[i].second);
                x[p[i].first]++;
                y[p[i].second]++;
        }
        for(i=1;i<=N;i++)
                ans += (x[p[i].first]-1)*1LL*(y[p[i].second]-1);
        printf("%lld\n",ans);
        return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:10:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         for(scanf("%d",&N),i=1;i<=N;i++){
             ~~~~~~~~~~~~~~^~~~
triangle.cpp:11:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%d%d",&p[i].first,&p[i].second);
                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100