oj.uz

답안 #109283

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
109283 2019-05-06T04:41:32 Z dupreez Calvinball championship (CEOI15_teams) C++14
20 / 100
 98 ms 63620 KB 
#include <iostream>
#include <algorithm>
#include <cstring>
#include <sstream>
#include <map>
#include <queue>
#include <vector>
#include <deque>
#include <climits>
#define scanf scanf_s
#define mk make_pair
#define pb push_back
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> pos;
const ll MOD = 1000000007, N = 2010.;

ll n, a[N], ans = 0,dp[N][N],dp2[N][N];

ll cal(ll lgt, ll knd) {
	return dp[lgt][knd] + dp2[lgt][knd + 1];
}

int main() {
	for (int i = 1; i < N; i++) { dp[1][i] = i; dp2[1][i] = 1; dp[0][i] = 1; }
	for (int i = 2; i < N; i++) {
		for (int j = 1; j < N - 1; j++) {
			ll v1 = (dp[i - 1][j] * j) % MOD, v2 = (dp2[i - 1][j + 1] * j) % MOD;
			dp[i][j] = (v1 + v2) % MOD;
			dp2[i][j] = (dp[i - 1][j] + dp2[i - 1][j + 1]) % MOD;
		}
	}
	cin >> n;
	for (int i = 1; i <= n; i++)cin >> a[i];
	ll knd = 0;
	for (int i = 1; i <= n; i++) {
		ll v1 = (a[i] - 1) * cal(n - i, knd);
		v1 %= MOD;
		ans = (ans + v1) % MOD;
		knd = max(knd, a[i]);
	}
	ans = (ans + 1) % MOD;
	cout << ans << endl;
	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 98 ms 63620 KB Output is correct
2 Correct 79 ms 63596 KB Output is correct
3 Correct 68 ms 63480 KB Output is correct
4 Correct 83 ms 63576 KB Output is correct
5 Correct 85 ms 63560 KB Output is correct
6 Correct 83 ms 63576 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 79 ms 63516 KB Output is correct
2 Correct 66 ms 63484 KB Output is correct
3 Correct 66 ms 63480 KB Output is correct

Subtask #3
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 71 ms 63552 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 71 ms 63616 KB Output isn't correct

Subtask #5
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 67 ms 63592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 74 ms 63580 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 92 ms 63528 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 80 ms 63596 KB Output isn't correct

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 84 ms 63556 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 80 ms 63620 KB Output isn't correct
2 Halted 0 ms 0 KB -