Submission #134148

#	Time	Username	Problem	Language	Result	Execution time	Memory
134148		huisung	Star triangles (IZhO11_triangle)	C++14	100 / 100	711 ms	13320 KiB

triangle

#include<bits/stdc++.h>
#define FOR(i,a,b) for(int i=int(a);i<=int(b);i++)
#define ROF(i,a,b) for(int i=int(b);i>=int(a);i--)
#define pb push_back
#define pq priority_queue
#define ps push
using namespace std;
struct point{int x,y;};
int n;
point in[300010];
long long anw;
map<int,long long> sero,garo;
int main(){
    cin>>n;
    FOR(i,1,n){
        scanf("%d %d",&in[i].x,&in[i].y);
        if(sero.find(in[i].y)==sero.end()) sero[in[i].y]=1;
        else sero[in[i].y]++;
        if(garo.find(in[i].x)==garo.end()) garo[in[i].x]=1;
        else garo[in[i].x]++;
    }
    FOR(i,1,n) anw+=((garo[in[i].x]-1)*(sero[in[i].y]-1));
    cout<<anw;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&in[i].x,&in[i].y);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100