oj.uz

답안 #448031

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
448031 2021-07-28T14:40:31 Z minoum Calvinball championship (CEOI15_teams) C++17
70 / 100
 738 ms 32172 KB 
#include<bits/stdc++.h>
 
using namespace std;
typedef long long int ll;
 
const int MAXN = 1005;
const ll md = 1e6+7;
 
ll n, a[MAXN], pt = 0;
ll ans = 0;
map <pair<int,int>,ll> dp;

void get(int sz, int t){
	if(dp[{sz,t}]) return;
	if(sz==0){
		dp[{sz,t}] = 1ll;
		return;
	}
	get(sz-1,t); get(sz-1,t+1);
	dp[{sz,t}] = (((ll)t*dp[{sz-1,t}])%md)+dp[{sz-1,t+1}]; 
	dp[{sz,t}] = (dp[{sz,t}]>=md?dp[{sz,t}]-md:dp[{sz,t}]);
	/*for(int i = 1; i < MAXN; i++) dp[1][i] = i+1, dp[0][i] = 1ll;
	for(ll i = 2; i < MAXN; i++)
		for(ll j = 1; j < MAXN; j++){
			dp[i][j] = (j*dp[i-1][j])%md;
			if(j+1 < MAXN) dp[i][j] += dp[i-1][j+1], dp[i][j] = (dp[i][j]>=md?dp[i][j]-md:dp[i][j]);
		}*/
	return;
}
 
int32_t main()
{
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	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;
		get(n-i+1,pt);
		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

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 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 0 ms 204 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 292 KB Output is correct
3 Correct 0 ms 204 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 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

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 588 KB Output is correct

Subtask #5
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 588 KB Output is correct
2 Correct 4 ms 588 KB Output is correct
3 Correct 4 ms 588 KB Output is correct

Subtask #6
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 132 ms 8104 KB Output is correct
2 Correct 131 ms 8228 KB Output is correct
3 Correct 135 ms 8216 KB Output is correct

Subtask #7
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 738 ms 31700 KB Output is correct
2 Correct 735 ms 31364 KB Output is correct
3 Correct 738 ms 31884 KB Output is correct

Subtask #8
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 701 ms 32172 KB Output isn't correct

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -