Submission #24402

#	Time	Username	Problem	Language	Result	Execution time	Memory
24402		Extazy	Star triangles (IZhO11_triangle)	C++14	100 / 100	689 ms	9156 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

const int N = 1<<19;

int n;
pair < int, int > a[N];
long long ans;
map < int, int > cntx,cnty;

int main() {
    int i;

    scanf("%d", &n);
    for(i=1;i<=n;i++) {
        scanf("%d %d", &a[i].first, &a[i].second);
        ++cntx[a[i].first];
        ++cnty[a[i].second];
    }
    for(i=1;i<=n;i++) {
        ans+=(cntx[a[i].first]-1)*(cnty[a[i].second]-1);
    }
    printf("%lld\n", ans);

    return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:15:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
triangle.cpp:17:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a[i].first, &a[i].second);
                                                  ^

• Subtask 1: 100 / 100