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Submission #43992

# Submission time Handle Problem Language Result Execution time Memory
43992 2018-03-29T08:56:32 Z sorry_Benq Calvinball championship (CEOI15_teams) C++17
100 / 100
 132 ms 1104 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
typedef long long ll;
const int MOD = 1e6 + 7;

ll a[10005];
ll DP[10005];
ll mxs[10005];

/*int solve(int N, int K){
	//you have N numbers left, and they can start anywhere from 1 - K.
	if (DP[N][K] != 0) return DP[N][K];
	if (N == 0) return 1;
	else{
		return DP[N][K] = (((long long) K)*solve(N - 1, K) + solve(N - 1, K + 1))%MOD;
	}
}*/

int cnt = 10005; 
void evolve(){
	for (int i = 0; i < cnt - 1; i++){
		DP[i] = ((long long) i)*DP[i] + DP[i + 1];
		DP[i] %= MOD;
	}
	cnt--;
}



main(){
	int N; cin >> N;
	for (int i = 0; i < N; i++){
		cin >> a[i];
	}
	for (int i = 0; i < cnt; i++){
		DP[i] = 1;
	}
	ll res = 1;
	int mx = 1;
	for (int i = 0; i < N; i++){
		mxs[i] = mx;
		mx = max(mx, a[i]);
	}
	for (int i = N - 1; i >= 0; i--){
		//matches prefix of length i
		res += ((ll) a[i] - 1)*DP[mxs[i]];
		evolve();
		res %= MOD;
	}
	cout << res << endl;
}

Compilation message

teams.cpp:31:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 516 KB Output is correct
3 Correct 2 ms 516 KB Output is correct
4 Correct 2 ms 516 KB Output is correct
5 Correct 2 ms 516 KB Output is correct
6 Correct 2 ms 592 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 592 KB Output is correct
2 Correct 2 ms 592 KB Output is correct
3 Correct 2 ms 592 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 592 KB Output is correct
2 Correct 2 ms 592 KB Output is correct
3 Correct 2 ms 592 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 592 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 592 KB Output is correct
2 Correct 4 ms 592 KB Output is correct
3 Correct 4 ms 592 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 592 KB Output is correct
2 Correct 14 ms 660 KB Output is correct
3 Correct 13 ms 660 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 660 KB Output is correct
2 Correct 24 ms 716 KB Output is correct
3 Correct 24 ms 716 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 844 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 85 ms 844 KB Output is correct
2 Correct 90 ms 844 KB Output is correct
3 Correct 97 ms 948 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 119 ms 948 KB Output is correct
2 Correct 130 ms 1104 KB Output is correct
3 Correct 116 ms 1104 KB Output is correct