#include <bits/stdc++.h>
#define fr first
#define se second
#define sc scanf
#define pf printf
#define ld long double
#define ll long long
#define pb push_back
#define sq(n) n * n
#define r_0 return 0
#define pr pair < ll, ll >
#define prr pair < pair < ll, ll >, ll >
#define fin(s) freopen( s, "r", stdin )
#define fout(s) freopen( s, "w", stdout )
#define TIME ios_base::sync_with_stdio(0)
using namespace std;
const ll INF = 1e9;
const ll N = 3e5 + 3;
const ll mod = 998244353;
const ld eps = 1e-7;
ll n, ans;
pr a[N];
ll mx[N], my[N];
main(){
TIME;
cin >> n;
for( int i = 1; i <= n; i ++ ){
ll x, y;
cin >> x >> y;
mx[x]++;
my[y]++;
a[i] = { x, y };
}
for( int i = 1; i <= n; i ++ ){
ll x = a[i].fr;
ll y = a[i].se;
ll g = mx[x];
ll h = my[y];
g--, h--;
ans += g * h;
}
cout << ans;
}
Compilation message
triangle.cpp:27:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
500 KB |
Output is correct |
| 3 |
Correct |
2 ms |
500 KB |
Output is correct |
| 4 |
Correct |
2 ms |
500 KB |
Output is correct |
| 5 |
Incorrect |
2 ms |
648 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
