Submission #336534

#	Time	Username	Problem	Language	Result	Execution time	Memory
336534		Kerim	Star triangles (IZhO11_triangle)	C++17	100 / 100	457 ms	12140 KiB

triangle

#include "bits/stdc++.h"
#define MAXN 300009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
map<int,int>X,Y;
int x[MAXN],y[MAXN];
int main(){
    //freopen("file.in", "r", stdin);
    int n;
    scanf("%d",&n);	
    for(int i=1;i<=n;i++)
		scanf("%d%d",x+i,y+i),X[x[i]]++,Y[y[i]]++;
	ll ans=n;
	for(int i=1;i<=n;i++)
		ans+=X[x[i]]*1LL*Y[y[i]]-X[x[i]]-Y[y[i]];
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
triangle.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |   scanf("%d%d",x+i,y+i),X[x[i]]++,Y[y[i]]++;
      |   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100