Submission #1655843


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll MOD = ll(1e9 + 7);

ll F(int l, int r);
ll T(int l, int r);

int N;
int C[300];

ll dpT[300][300];
ll dpF[300][300];

ll F(int l, int r){
	ll& d = dpF[l][r];
	if(d != -1) return d;
	int len = r - l;
	if(len == 1) return 1;
	d = 0;
	for(int i = l + 1; i < r; i++){
		if(C[l] < C[i]){
			d += T(l, i) * F(i, r);
			d %= MOD;
		}
	}
	d += T(l, r);
	d %= MOD;
	return d;
}

ll T(int l, int r){
	ll& d = dpT[l][r];
	if(d != -1) return d;
	int len = r - l;
	if(len == 1) return 1;
	return d = F(l + 1, r);
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
#ifdef LOCAL
	std::ifstream in("in");
	std::cin.rdbuf(in.rdbuf());
#endif

	cin >> N;
	for(int i = 0; i < N; i++){
		cin >> C[i];
	}
	memset(dpT, -1, sizeof dpT);
	memset(dpF, -1, sizeof dpF);
	if(C[0] != 1){
		cout << 0 << endl;
	}
	else{
		cout << T(0, N) << endl;
	}
}

Submission Info

Submission Time
Task G - スタンプラリー
User femto16
Language C++14 (GCC 5.4.1)
Score 100
Code Size 969 Byte
Status AC
Exec Time 20 ms
Memory 1664 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 100 / 100
Status
AC × 3
AC × 27
Set Name Test Cases
Sample sample-01.txt, sample-02.txt, sample-03.txt
All sample-01.txt, sample-02.txt, sample-03.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 01-11.txt, 01-12.txt, 01-13.txt, 01-14.txt, 01-15.txt, 01-16.txt, 01-17.txt, 01-18.txt, 01-19.txt, 01-20.txt, 01-21.txt, sample-01.txt, sample-02.txt, sample-03.txt
Case Name Status Exec Time Memory
01-01.txt AC 2 ms 1664 KB
01-02.txt AC 2 ms 1664 KB
01-03.txt AC 2 ms 1664 KB
01-04.txt AC 13 ms 1664 KB
01-05.txt AC 13 ms 1664 KB
01-06.txt AC 13 ms 1664 KB
01-07.txt AC 13 ms 1664 KB
01-08.txt AC 2 ms 1664 KB
01-09.txt AC 2 ms 1664 KB
01-10.txt AC 19 ms 1664 KB
01-11.txt AC 10 ms 1664 KB
01-12.txt AC 19 ms 1664 KB
01-13.txt AC 12 ms 1664 KB
01-14.txt AC 17 ms 1664 KB
01-15.txt AC 11 ms 1664 KB
01-16.txt AC 2 ms 1664 KB
01-17.txt AC 2 ms 1664 KB
01-18.txt AC 20 ms 1664 KB
01-19.txt AC 19 ms 1664 KB
01-20.txt AC 2 ms 1664 KB
01-21.txt AC 2 ms 1664 KB
sample-01.txt AC 2 ms 1664 KB
sample-02.txt AC 2 ms 1664 KB
sample-03.txt AC 2 ms 1664 KB