제출 #281135

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
281135		AQT	Calvinball championship (CEOI15_teams)	C++14	0 / 100	1097 ms	512 KiB

teams

#include <bits/stdc++.h>

using namespace std;

int N;
int arr[1005];
long long dp[1005][1005];
const long long MOD = 1000007;

long long solve(int n, int m, bool border){
	if(n == N+1){
		return 1;
	}
	if(!border && dp[n][m]){
		return dp[n][m];
	}
	int lim = m+1;
	if(border){
		lim = arr[n];
	}
	long long ans = 0;
	for(int i = 1; i<=lim; i++){
		ans += solve(n+1, i, border && (lim == arr[n]));
	}
	ans %= MOD;
	if(!border){
		dp[n][m] = ans%MOD;
	}
	return ans;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> N;
	for(int i = 1; i<=N; i++){
		cin >> arr[i];
	}
	cout << solve(1, 0, 1);
	
}

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