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Submission #527359

# Submission time Handle Problem Language Result Execution time Memory
527359 2022-02-17T09:44:46 Z siewjh Calvinball championship (CEOI15_teams) C++17
100 / 100
 96 ms 608 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
using namespace std;
typedef long long ll;
const ll mod = 1'000'007;
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int nums;  cin >> nums;
	vector<int> vec(nums + 1), pmax(nums + 1, 0);
	for (int i = 1; i <= nums; i++) {
		cin >> vec[i];
		pmax[i] = max(pmax[i - 1], vec[i]);
	}
	vector<vector<ll>> memo(2, vector<ll>(nums + 1, 0));
	bool prev = 0;
	for (int i = 1; i < nums; i++) memo[0][i] = 1;
	int ans = 0;
	for (int i = nums; i >= 1; i--) {
		ans += (memo[prev][pmax[i - 1]] * (vec[i] - 1)) % mod;
		ans %= mod;
		for (int j = 1; j < i; j++) memo[1 - prev][j] = (j * memo[prev][j] + memo[prev][j + 1]) % mod;
		prev = 1 - prev;
	}
	cout << (ans + 1) % mod;
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 244 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 280 KB Output is correct
3 Correct 1 ms 204 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 2 ms 332 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 82 ms 572 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 464 KB Output is correct
2 Correct 23 ms 460 KB Output is correct
3 Correct 23 ms 460 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 608 KB Output is correct
2 Correct 96 ms 588 KB Output is correct
3 Correct 84 ms 588 KB Output is correct