oj.uz

Submission #733008

# Submission time Handle Problem Language Result Execution time Memory
733008 2023-04-30T02:19:32 Z SanguineChameleon Boat (APIO16_boat) C++17
36 / 100
 2000 ms 340 KB 
#include <bits/stdc++.h>
using namespace std;

void just_do_it();

int main() {
	#ifdef KAMIRULEZ
		freopen("kamirulez.inp", "r", stdin);
		freopen("kamirulez.out", "w", stdout);
	#endif
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	just_do_it();
	return 0;
}

const int maxn = 5e2 + 20;
const long long mod = 1e9 + 7;
bool flag[maxn];
long long inv[maxn];
long long fact_inv[maxn];
long long cur[maxn];
long long nxt[maxn];
pair<int, int> events[maxn * 2];
int n;

void trans() {
	for (int i = 1; i <= n; i++) {
		if (flag[i]) {
			nxt[i] = (cur[i] + 1) % mod;
		}
		else {
			nxt[i] = cur[i];
		}
	}
	for (int i = 1; i <= n; i++) {
		for (int j = i + 1; j <= n; j++) {
			if (flag[j]) {
				nxt[j] = (nxt[j] + cur[i]) % mod;
			}
		}
	}
	swap(cur, nxt);
}

long long choose(int x, int y) {
	if (x < y) {
		return 0;
	}
	long long res = fact_inv[y];
	for (int i = 0; i < y; i++) {
		res = res * (x - i) % mod;
	}
	return res;
}

void shift(int len) {
	for (int i = 1; i <= n; i++) {
		if (flag[i]) {
			nxt[i] = (cur[i] + len) % mod;
		}
		else {
			nxt[i] = cur[i];
		}
	}
	for (int i = 1; i <= n; i++) {
		int cnt = 0;
		for (int j = i + 1; j <= n; j++) {
			if (flag[j]) {
				cnt++;
				if (flag[i]) {
					nxt[j] = (nxt[j] + cur[i] * choose(len + cnt - 1, cnt) + choose(len + cnt - 1, cnt + 1)) % mod;
				}
				else {
					nxt[j] = (nxt[j] + cur[i] * choose(len + cnt - 1, cnt)) % mod;
				}
			}
		}
	}
	swap(cur, nxt);
}

void just_do_it() {
	inv[1] = 1;
	fact_inv[0] = 1;
	fact_inv[1] = 1;
	for (int i = 2; i < maxn; i++) {
		inv[i] = (mod - mod / i) * inv[mod % i] % mod;
		fact_inv[i] = fact_inv[i - 1] * inv[i] % mod;
	}
	cin >> n;
	for (int i = 1; i <= n; i++) {
		int a, b;
		cin >> a >> b;
		events[i * 2 - 1] = make_pair(a, i);
		events[i * 2] = make_pair(b + 1, -i);
	}
	sort(events + 1, events + n * 2 + 1);
	int cur_t = 0;
	for (int i = 1; i <= n * 2; i++) {
		int nxt_t = events[i].first;
		int id = events[i].second;
		bool begin_t = (i == 1 || events[i].first != events[i - 1].first);
		bool end_t = (i == n * 2 || events[i].first != events[i + 1].first);
		if (begin_t) {
			if (cur_t < nxt_t - 1) {
				shift(nxt_t - 1 - cur_t);
				cur_t = nxt_t - 1;
			}
		}
		if (id > 0) {
			flag[id] = true;
		}
		else {
			flag[-id] = false;
		}
		if (end_t && cur_t == nxt_t - 1) {
			trans();
			cur_t = nxt_t;
		}
	}
	long long res = 0;
	for (int i = 1; i <= n; i++) {
		res += cur[i];
		res %= mod;
	}
	cout << res;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 159 ms 324 KB Output is correct
2 Correct 149 ms 340 KB Output is correct
3 Correct 150 ms 340 KB Output is correct
4 Correct 169 ms 340 KB Output is correct
5 Correct 139 ms 340 KB Output is correct
6 Correct 155 ms 340 KB Output is correct
7 Correct 166 ms 340 KB Output is correct
8 Correct 150 ms 340 KB Output is correct
9 Correct 151 ms 320 KB Output is correct
10 Correct 160 ms 340 KB Output is correct
11 Correct 148 ms 340 KB Output is correct
12 Correct 145 ms 340 KB Output is correct
13 Correct 149 ms 340 KB Output is correct
14 Correct 157 ms 340 KB Output is correct
15 Correct 142 ms 340 KB Output is correct
16 Correct 27 ms 340 KB Output is correct
17 Correct 31 ms 320 KB Output is correct
18 Correct 30 ms 212 KB Output is correct
19 Correct 36 ms 212 KB Output is correct
20 Correct 27 ms 340 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 159 ms 324 KB Output is correct
2 Correct 149 ms 340 KB Output is correct
3 Correct 150 ms 340 KB Output is correct
4 Correct 169 ms 340 KB Output is correct
5 Correct 139 ms 340 KB Output is correct
6 Correct 155 ms 340 KB Output is correct
7 Correct 166 ms 340 KB Output is correct
8 Correct 150 ms 340 KB Output is correct
9 Correct 151 ms 320 KB Output is correct
10 Correct 160 ms 340 KB Output is correct
11 Correct 148 ms 340 KB Output is correct
12 Correct 145 ms 340 KB Output is correct
13 Correct 149 ms 340 KB Output is correct
14 Correct 157 ms 340 KB Output is correct
15 Correct 142 ms 340 KB Output is correct
16 Correct 27 ms 340 KB Output is correct
17 Correct 31 ms 320 KB Output is correct
18 Correct 30 ms 212 KB Output is correct
19 Correct 36 ms 212 KB Output is correct
20 Correct 27 ms 340 KB Output is correct
21 Execution timed out 2083 ms 212 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 212 KB Output is correct
2 Correct 22 ms 212 KB Output is correct
3 Correct 31 ms 316 KB Output is correct
4 Correct 35 ms 212 KB Output is correct
5 Correct 36 ms 332 KB Output is correct
6 Correct 93 ms 332 KB Output is correct
7 Correct 88 ms 212 KB Output is correct
8 Correct 89 ms 320 KB Output is correct
9 Correct 93 ms 320 KB Output is correct
10 Correct 96 ms 320 KB Output is correct
11 Correct 36 ms 340 KB Output is correct
12 Correct 21 ms 212 KB Output is correct
13 Correct 27 ms 316 KB Output is correct
14 Correct 26 ms 212 KB Output is correct
15 Correct 35 ms 212 KB Output is correct
16 Correct 15 ms 340 KB Output is correct
17 Correct 12 ms 332 KB Output is correct
18 Correct 14 ms 336 KB Output is correct
19 Correct 12 ms 340 KB Output is correct
20 Correct 19 ms 340 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 159 ms 324 KB Output is correct
2 Correct 149 ms 340 KB Output is correct
3 Correct 150 ms 340 KB Output is correct
4 Correct 169 ms 340 KB Output is correct
5 Correct 139 ms 340 KB Output is correct
6 Correct 155 ms 340 KB Output is correct
7 Correct 166 ms 340 KB Output is correct
8 Correct 150 ms 340 KB Output is correct
9 Correct 151 ms 320 KB Output is correct
10 Correct 160 ms 340 KB Output is correct
11 Correct 148 ms 340 KB Output is correct
12 Correct 145 ms 340 KB Output is correct
13 Correct 149 ms 340 KB Output is correct
14 Correct 157 ms 340 KB Output is correct
15 Correct 142 ms 340 KB Output is correct
16 Correct 27 ms 340 KB Output is correct
17 Correct 31 ms 320 KB Output is correct
18 Correct 30 ms 212 KB Output is correct
19 Correct 36 ms 212 KB Output is correct
20 Correct 27 ms 340 KB Output is correct
21 Execution timed out 2083 ms 212 KB Time limit exceeded
22 Halted 0 ms 0 KB -