Submission #168100

#	Time	Username	Problem	Language	Result	Execution time	Memory
168100		GioChkhaidze	Star triangles (IZhO11_triangle)	C++14	100 / 100	529 ms	15608 KiB

triangle

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int N=3e5+5;
ll n,x[N],y[N],ans;
map < ll , ll > f1,f2;
main () {
	scanf("%d",&n);
	for (int i=1; i<=n; i++) {
		scanf("%d%d",&x[i],&y[i]);
		f1[x[i]]++,f2[y[i]]++;
	}
	
	for (int i=1; i<=n; i++) 
		ans+=(f1[x[i]]-1)*(f2[y[i]]-1);
		
	printf("%lld\n",ans);
}

Compilation message (stderr)

triangle.cpp:7:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
triangle.cpp: In function 'int main()':
triangle.cpp:8:15: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  scanf("%d",&n);
             ~~^
triangle.cpp:10:27: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
   scanf("%d%d",&x[i],&y[i]);
                ~~~~~      ^
triangle.cpp:10:27: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]
triangle.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
triangle.cpp:10:8: 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