Submission #86280

#	Time	Username	Problem	Language	Result	Execution time	Memory
86280		rzbt	Calvinball championship (CEOI15_teams)	C++14	100 / 100	417 ms	1068 KiB

teams

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
const int MAXN = 10010;
const ll MOD =  1000007LL;
 
ll dp[2][MAXN];
ll tot;
int N,vetor[MAXN];
 
ll solve(int pos,int maior){
	if(dp[pos][maior] != -1) return dp[pos][maior];
	if(pos == N + 1){
		return dp[pos][maior] = 1;
	}
	ll ans = 1LL*(maior - 1)*solve(pos+1,maior);
	ans += solve(pos+1,maior+1);
	return dp[pos][maior] = (int)(ans % MOD);
}
 
int main(){
	cin >> N;
	for(int i = 1;i<=N;i++) cin >> vetor[i];
	for(int i = 1;i<=N+2;i++) dp[0][i] = 1;
	for(int i = N;i>=1;i--){
		int maior = 0;
		for(int j = 1;j<i;j++) maior = max(maior,vetor[j]);
		swap(dp[0],dp[1]);
		for(int j = 1;j<=N+1;j++){
			dp[0][j] = (j-1)*dp[1][j] + dp[1][j+1];
			dp[0][j] %= MOD;
		}
		for(int j = 1;j<vetor[i];j++){
			tot += dp[1][max(j,maior) + 1];
		}
		tot %= MOD;
	}
	tot++;
	tot %= MOD;
	cout << tot << endl;
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10