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Submission #447652

# Submission time Handle Problem Language Result Execution time Memory
447652 2021-07-27T08:33:00 Z minoum Calvinball championship (CEOI15_teams) C++17
20 / 100
 20 ms 16100 KB 
#include<bits/stdc++.h>

using namespace std;
typedef long long int ll;

#define int ll

const int MAXN = 1005, M2 = 2005;
const ll md = 1e9+7;

ll n, a[MAXN], pt = 0;
ll dp[MAXN][M2], ans = 0;

int32_t main()
{
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	for(int i = 1; i < M2; i++) dp[1][i] = i+1, dp[0][i] = 1ll;
	for(ll i = 2; i < MAXN; i++)
		for(ll j = 1; j < M2; j++){
			dp[i][j] = (j*dp[i-1][j])%md;
			if(j+1 < M2) dp[i][j] = (dp[i][j]+dp[i-1][j+1])%md;
		}
	cin >> n;
	for(int i = 0; i < n; i++) cin >> a[i];
	pt = 1;
	for(int i = 0; i < n; i++){
		if(a[i]==1) continue;
		ll tmp = (ll)a[i]-1ll;
		tmp = (tmp*dp[n-i-1][pt])%md;
		ans = (ans+tmp)%md;
		if(a[i]==pt+1) pt++;
	}
	cout << (ans+1)%md << '\n';
	return 0; 
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 16028 KB Output is correct
2 Correct 18 ms 15988 KB Output is correct
3 Correct 15 ms 16096 KB Output is correct
4 Correct 15 ms 16008 KB Output is correct
5 Correct 15 ms 16076 KB Output is correct
6 Correct 16 ms 16012 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 16088 KB Output is correct
2 Correct 15 ms 16076 KB Output is correct
3 Correct 15 ms 16076 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 14 ms 15976 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 18 ms 16096 KB Output isn't correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 16084 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 16088 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 16028 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 16092 KB Output isn't correct

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 16056 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 16100 KB Output isn't correct
2 Halted 0 ms 0 KB -