oj.uz

Submission #1020830

# Submission time Handle Problem Language Result Execution time Memory
1020830 2024-07-12T10:20:13 Z flappybird Boat (APIO16_boat) C++17
27 / 100
 1374 ms 8276 KB 
#include <bits/stdc++.h>
#include <cassert>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
#define MAX 510
#define MAXQ 101010
#define INF 1000000100
#define bb ' '
#define ln '\n'
#define Ln '\n'
#define MOD 1000000007
int A[MAX];
int B[MAX];
int sz[MAX];
ll C[MAX * 2][MAX];
ll dp[MAX][MAX * 2];
ll mpow(ll x, ll y = MOD - 2) {
	if (!y) return 1;
	ll res = mpow(x, y >> 1);
	res *= res;
	res %= MOD;
	if (y & 1) res = (res * x) % MOD;
	return res;
}
ll rev[MAX * 2];
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int N;
	cin >> N;
	int i, j, k;
	vector<int> v;
	for (i = 1; i <= N; i++) {
		cin >> A[i] >> B[i];
		B[i]++;
		v.push_back(A[i]);
		v.push_back(B[i]);
	}
	sort(v.begin(), v.end());
	v.erase(unique(v.begin(), v.end()), v.end());
	for (i = 1; i <= N; i++) {
		A[i] = lower_bound(v.begin(), v.end(), A[i]) - v.begin();
		B[i] = lower_bound(v.begin(), v.end(), B[i]) - v.begin();
	}
	for (i = 1; i <= N * 2; i++) rev[i] = mpow(i);
	int X = v.size() - 1;
	for (i = 0; i < X; i++) {
		sz[i] = v[i + 1] - v[i];
		for (j = 1; j <= N; j++) {
			ll c1, c2;
			c1 = 1;
			c2 = sz[i];
			C[i][j] += c1 * c2;
			C[i][j] %= MOD;
			for (k = 0; k < j - 1; k++) {
				c1 *= j - 1 - k;
				c1 %= MOD;
				c1 *= rev[k + 1];
				c1 %= MOD;
				c2 *= sz[i] - (k + 1);
				c2 %= MOD;
				c2 *= rev[k + 2];
				c2 %= MOD;
				C[i][j] += c1 * c2;
				C[i][j] %= MOD;
			}
		}
	}
	for (i = 1; i <= N; i++) {
		int cnt = 1;
		if (A[i] == 0) {
			for (j = 1; j < i; j++) if (A[j] == 0) cnt++;
			dp[i][0] += C[0][cnt];
			dp[i][0] %= MOD;
		}
		for (j = 1; j < X; j++) {
			dp[i][j] = dp[i][j - 1];
			if (B[i] <= j) continue;
			if (j < A[i]) continue;
			cnt = 1;
			for (k = i - 1; k >= 1; k--) {
				dp[i][j] += C[j][cnt] * dp[k][j - 1];
				dp[i][j] %= MOD;
				if (A[k] <= j && j < B[k]) cnt++;
			}
			dp[i][j] += C[j][cnt];
			dp[i][j] %= MOD;
		}
	}
	ll ans = 0;
	for (i = 1; i <= N; i++) ans = (ans + dp[i][X - 1]) % MOD;
	cout << ans;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1374 ms 8276 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 1374 ms 8276 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 1624 KB Output is correct
2 Correct 12 ms 1628 KB Output is correct
3 Correct 12 ms 1660 KB Output is correct
4 Correct 13 ms 1628 KB Output is correct
5 Correct 13 ms 1768 KB Output is correct
6 Correct 13 ms 1884 KB Output is correct
7 Correct 13 ms 1628 KB Output is correct
8 Correct 13 ms 1760 KB Output is correct
9 Correct 13 ms 1624 KB Output is correct
10 Correct 14 ms 1768 KB Output is correct
11 Correct 12 ms 1628 KB Output is correct
12 Correct 12 ms 1628 KB Output is correct
13 Correct 12 ms 1864 KB Output is correct
14 Correct 12 ms 1628 KB Output is correct
15 Correct 12 ms 1800 KB Output is correct
16 Correct 8 ms 1280 KB Output is correct
17 Correct 8 ms 1372 KB Output is correct
18 Correct 8 ms 1368 KB Output is correct
19 Correct 8 ms 1368 KB Output is correct
20 Correct 7 ms 1368 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Incorrect 1374 ms 8276 KB Output isn't correct
2 Halted 0 ms 0 KB -