Submission #49241

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
49241	2018-05-24T01:22:36 Z	spencercompton	Tents (JOI18_tents)	C++17	100 / 100	718 ms	71456 KB

tents

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll dp[3001][3001];
ll mod = 1000000007LL;
ll go(int rows, int cols){
	if(rows==0 || cols==0){
		return 1LL;
	}
	if(dp[rows][cols]!=-1){
		return dp[rows][cols];
	}
	ll ret = go(rows-1,cols);
	if(cols>=2){
		ret += ((ll)cols*(ll)(cols-1))/2LL*go(rows-1,cols-2);
		ret %= mod;
	}
	if(rows>=2){
		ret += (ll)cols*(ll)(rows-1)*go(rows-2,cols-1);
		ret %= mod;
	}
	ret += 4LL*(ll)cols*go(rows-1,cols-1);
	ret %= mod;
	dp[rows][cols] = ret;
	return ret;
}
int main(){
	for(int a = 0; a<=3000; a++){
		for(int b =0; b<=3000; b++){
			dp[a][b] = -1;
		}
	}
	int r, c;
	cin >> r >> c;
	cout << (go(r,c)+mod-1LL)%mod << endl;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	49 ms	70776 KB	Output is correct
2	Correct	47 ms	70776 KB	Output is correct
3	Correct	49 ms	70920 KB	Output is correct
4	Correct	51 ms	70972 KB	Output is correct
5	Correct	49 ms	70972 KB	Output is correct
6	Correct	53 ms	70996 KB	Output is correct
7	Correct	54 ms	70996 KB	Output is correct
8	Correct	85 ms	70996 KB	Output is correct
9	Correct	59 ms	71024 KB	Output is correct
10	Correct	56 ms	71024 KB	Output is correct
11	Correct	54 ms	71072 KB	Output is correct
12	Correct	70 ms	71072 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	49 ms	70776 KB	Output is correct
2	Correct	47 ms	70776 KB	Output is correct
3	Correct	49 ms	70920 KB	Output is correct
4	Correct	51 ms	70972 KB	Output is correct
5	Correct	49 ms	70972 KB	Output is correct
6	Correct	53 ms	70996 KB	Output is correct
7	Correct	54 ms	70996 KB	Output is correct
8	Correct	85 ms	70996 KB	Output is correct
9	Correct	59 ms	71024 KB	Output is correct
10	Correct	56 ms	71024 KB	Output is correct
11	Correct	54 ms	71072 KB	Output is correct
12	Correct	70 ms	71072 KB	Output is correct
13	Correct	54 ms	71072 KB	Output is correct
14	Correct	53 ms	71200 KB	Output is correct
15	Correct	430 ms	71300 KB	Output is correct
16	Correct	70 ms	71300 KB	Output is correct
17	Correct	97 ms	71300 KB	Output is correct
18	Correct	156 ms	71300 KB	Output is correct
19	Correct	533 ms	71332 KB	Output is correct
20	Correct	449 ms	71420 KB	Output is correct
21	Correct	239 ms	71420 KB	Output is correct
22	Correct	313 ms	71420 KB	Output is correct
23	Correct	199 ms	71420 KB	Output is correct
24	Correct	646 ms	71420 KB	Output is correct
25	Correct	467 ms	71456 KB	Output is correct
26	Correct	578 ms	71456 KB	Output is correct
27	Correct	718 ms	71456 KB	Output is correct