// In the name of Allah
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef complex<ld> cld;
#define all(x) (x).begin(),(x).end()
#define len(x) ((ll) (x).size())
#define F first
#define S second
#define X real()
#define Y imag()
#define pb push_back
#define sep ' '
#define endl '\n'
#define Mp make_pair
#define kill(x) cout << x << '\n', exit(0)
#define set_dec(x) cout << fixed << setprecision(x);
#define file_io(x,y) freopen(x, "r", stdin); freopen(y, "w", stdout);
int n;
const int maxn = 4000 + 4;
const int mod = 1e9 + 7;
pii A[maxn]; int ind[maxn];
pii p[maxn]; int num;
pii get(int a) {
if (p[a].F == a) return p[a];
auto x = get(p[a].F); x.S ^= p[a].S;
return (p[a] = x);
}
void merge(int u, int v) {
pii a = get(u), b = get(v);
if (a.F == b.F) {
if (a.S == b.S) kill(0);
return ;
}
p[a.F] = Mp(b.F, (a.S == b.S)); num--;
}
ll power(ll a, ll b) {
if (b == 0) return 1;
return power(a * a % mod, b / 2) * ((b & 1) ? a : 1) % mod;
}
int main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 0; i < n; i++) {
cin >> A[i].F >> A[i].S;
A[i].F--; A[i].S--;
ind[A[i].F] = i; ind[A[i].S] = i;
}
num = n;
for (int i = 0; i < n; i++) p[i] = Mp(i, 0);
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (A[j].F > A[i].F && A[j].F < A[i].S && A[j].S > A[i].S) {
merge(i, j);
}
}
}
cout << power(2, num) << endl;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
1 ms |
600 KB |
Output is correct |
| 8 |
Correct |
1 ms |
344 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
1 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
356 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
600 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
1 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
1 ms |
600 KB |
Output is correct |
| 8 |
Correct |
1 ms |
344 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
1 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
356 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
600 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
1 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| 25 |
Correct |
12 ms |
348 KB |
Output is correct |
| 26 |
Correct |
13 ms |
536 KB |
Output is correct |
| 27 |
Correct |
13 ms |
348 KB |
Output is correct |
| 28 |
Correct |
13 ms |
348 KB |
Output is correct |
| 29 |
Correct |
13 ms |
348 KB |
Output is correct |
| 30 |
Correct |
17 ms |
348 KB |
Output is correct |
| 31 |
Correct |
13 ms |
344 KB |
Output is correct |
| 32 |
Correct |
15 ms |
536 KB |
Output is correct |
| 33 |
Correct |
1 ms |
352 KB |
Output is correct |
| 34 |
Correct |
1 ms |
348 KB |
Output is correct |
| 35 |
Correct |
10 ms |
600 KB |
Output is correct |
| 36 |
Correct |
12 ms |
536 KB |
Output is correct |
| 37 |
Correct |
1 ms |
348 KB |
Output is correct |
| 38 |
Correct |
1 ms |
348 KB |
Output is correct |
| 39 |
Correct |
13 ms |
348 KB |
Output is correct |
| 40 |
Correct |
11 ms |
772 KB |
Output is correct |
| 41 |
Correct |
26 ms |
348 KB |
Output is correct |
| 42 |
Correct |
28 ms |
564 KB |
Output is correct |
| 43 |
Correct |
10 ms |
348 KB |
Output is correct |
| 44 |
Correct |
10 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
1 ms |
600 KB |
Output is correct |
| 8 |
Correct |
1 ms |
344 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
1 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
356 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
600 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
1 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| 25 |
Correct |
12 ms |
348 KB |
Output is correct |
| 26 |
Correct |
13 ms |
536 KB |
Output is correct |
| 27 |
Correct |
13 ms |
348 KB |
Output is correct |
| 28 |
Correct |
13 ms |
348 KB |
Output is correct |
| 29 |
Correct |
13 ms |
348 KB |
Output is correct |
| 30 |
Correct |
17 ms |
348 KB |
Output is correct |
| 31 |
Correct |
13 ms |
344 KB |
Output is correct |
| 32 |
Correct |
15 ms |
536 KB |
Output is correct |
| 33 |
Correct |
1 ms |
352 KB |
Output is correct |
| 34 |
Correct |
1 ms |
348 KB |
Output is correct |
| 35 |
Correct |
10 ms |
600 KB |
Output is correct |
| 36 |
Correct |
12 ms |
536 KB |
Output is correct |
| 37 |
Correct |
1 ms |
348 KB |
Output is correct |
| 38 |
Correct |
1 ms |
348 KB |
Output is correct |
| 39 |
Correct |
13 ms |
348 KB |
Output is correct |
| 40 |
Correct |
11 ms |
772 KB |
Output is correct |
| 41 |
Correct |
26 ms |
348 KB |
Output is correct |
| 42 |
Correct |
28 ms |
564 KB |
Output is correct |
| 43 |
Correct |
10 ms |
348 KB |
Output is correct |
| 44 |
Correct |
10 ms |
348 KB |
Output is correct |
| 45 |
Runtime error |
1 ms |
604 KB |
Execution killed with signal 11 |
| 46 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
1 ms |
600 KB |
Output is correct |
| 8 |
Correct |
1 ms |
344 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
1 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
356 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
600 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
1 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| 25 |
Correct |
12 ms |
348 KB |
Output is correct |
| 26 |
Correct |
13 ms |
536 KB |
Output is correct |
| 27 |
Correct |
13 ms |
348 KB |
Output is correct |
| 28 |
Correct |
13 ms |
348 KB |
Output is correct |
| 29 |
Correct |
13 ms |
348 KB |
Output is correct |
| 30 |
Correct |
17 ms |
348 KB |
Output is correct |
| 31 |
Correct |
13 ms |
344 KB |
Output is correct |
| 32 |
Correct |
15 ms |
536 KB |
Output is correct |
| 33 |
Correct |
1 ms |
352 KB |
Output is correct |
| 34 |
Correct |
1 ms |
348 KB |
Output is correct |
| 35 |
Correct |
10 ms |
600 KB |
Output is correct |
| 36 |
Correct |
12 ms |
536 KB |
Output is correct |
| 37 |
Correct |
1 ms |
348 KB |
Output is correct |
| 38 |
Correct |
1 ms |
348 KB |
Output is correct |
| 39 |
Correct |
13 ms |
348 KB |
Output is correct |
| 40 |
Correct |
11 ms |
772 KB |
Output is correct |
| 41 |
Correct |
26 ms |
348 KB |
Output is correct |
| 42 |
Correct |
28 ms |
564 KB |
Output is correct |
| 43 |
Correct |
10 ms |
348 KB |
Output is correct |
| 44 |
Correct |
10 ms |
348 KB |
Output is correct |
| 45 |
Runtime error |
1 ms |
604 KB |
Execution killed with signal 11 |
| 46 |
Halted |
0 ms |
0 KB |
- |
