#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define mp make_pair
#define si short int
#define speed ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define pill pair<ll,ll>
#define f first
#define s second
#define pilc pair<ll,char>
#define all(a) (a).begin(),(a).end()
#define rep(s,e,step) for(int i = (s); i < (e) ; i += step)
#define vrep(s,e,step) for(int j = (s); j < (e) ; j += step)
#define ex exit(0)
#define sz(a) (a).size()
#define triple pair<pill, ll>
#define pinode pair<node*, node*>
#define quadra pair<pill, pill>
#define ld long double
using namespace std;
const ll N = 4e5 + 10;
const ll M = 1e3 + 10;
const ll big = 1e9;
const ll hsh2 = 1964325029;
const ll wp = 491;
const long long mod = 1e9 + 7;
const long double EPS = 1e-14;
const ll block = 1e7;
const ll shift = 2e3;
mt19937_64 rofl(chrono::steady_clock::now().time_since_epoch().count());
ll n, x[N], y[N];
vector<ll> z, z2;
ll f[N], k[N];
map<pill, ll> cnt;
int main() {
speed;
ifstream cin("triangles.in");
ofstream cout("triangles.out");
cin >> n;
for(int i = 1; i <= n; i++) {
cin >> x[i] >> y[i];
z.pb(x[i]), z2.pb(y[i]);
}
sort(all(z)), sort(all(z2));
z.erase(unique(all(z)), z.end()), z2.erase(unique(all(z2)), z2.end());
for(int i = 1; i <= n; i++) {
x[i] = lower_bound(all(z), x[i]) - z.begin();
y[i] = lower_bound(all(z2), y[i]) - z2.begin();
f[x[i]]++;
k[y[i]]++;
cnt[mp(x[i], y[i])]++;
}
ll ans = 0;
for(int i = 1; i <= n; i++) {
ll b = cnt[mp(x[i], y[i])];
ans += (f[x[i]] - b) * (k[y[i]] - b);
}
cout << ans;
}
/*
AAAACACA
*/
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
