oj.uz

Submission #1085575

# Submission time Handle Problem Language Result Execution time Memory
1085575 2024-09-08T12:46:21 Z Sunbae Star triangles (IZhO11_triangle) C++17
100 / 100
 208 ms 11860 KB 
#include <bits/stdc++.h>
typedef long long ll;
#define mp make_pair
#define F first
#define S second
using namespace std;
using pii = pair<int,int>;
const int N = 3e5 + 5;
pii p[N];
int cp[2][N], m[2];
ll cnt[2][N];
int pos(int t, int x){ return lower_bound(cp[t], cp[t]+m[t], x) - cp[t];}
signed main(){
	int n; scanf("%d", &n);
	for(int i = 0, x, y; i<n; ++i){
		scanf("%d %d", &x, &y);
		p[i] = mp(x, y);
		cp[0][m[0]++] = x;
		cp[1][m[1]++] = y;
	}
	for(int j = 0; j<2; ++j) sort(cp[j], cp[j]+m[j]), m[j] = unique(cp[j], cp[j]+m[j]) - cp[j];
	for(int i = 0; i<n; ++i) ++cnt[0][pos(0, p[i].F)], ++cnt[1][pos(1, p[i].S)];
	ll tot = 0;
	for(int i = 0; i<n; ++i){
		int x = pos(0, p[i].F), y = pos(1, p[i].S);
		tot += (cnt[0][x] - 1) * (cnt[1][y] - 1);
	}
	printf("%lld", tot);
}

Compilation message

triangle.cpp: In function 'int main()':
triangle.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  int n; scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
triangle.cpp:16:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   scanf("%d %d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 4 ms 620 KB Output is correct
13 Correct 5 ms 1112 KB Output is correct
14 Correct 6 ms 860 KB Output is correct
15 Correct 65 ms 4648 KB Output is correct
16 Correct 67 ms 4868 KB Output is correct
17 Correct 64 ms 4444 KB Output is correct
18 Correct 63 ms 4420 KB Output is correct
19 Correct 184 ms 11268 KB Output is correct
20 Correct 137 ms 8372 KB Output is correct
21 Correct 208 ms 11860 KB Output is correct
22 Correct 206 ms 11856 KB Output is correct