Submission #163881

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
163881	2019-11-15T23:36:22 Z	arnold518	Tents (JOI18_tents)	C++14	100 / 100	86 ms	71004 KB

tents

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 3000;
const ll MOD = 1e9+7;

int H, W;
ll dp[MAXN+10][MAXN+10];

int main()
{
	int i, j;
	scanf("%d%d", &H, &W);

	for(i=0; i<=H; i++) dp[i][0]=1;
	for(i=0; i<=W; i++) dp[0][i]=1;

	for(i=0; i<=H; i++) dp[i][1]=(ll)i*(i-1)/2+4*i+1, dp[i][1]%=MOD;
	for(i=0; i<=W; i++) dp[1][i]=(ll)i*(i-1)/2+4*i+1, dp[1][i]%=MOD;

	for(i=2; i<=H; i++)
	{
		for(j=2; j<=W; j++)
		{
			dp[i][j]=dp[i-1][j]+(ll)j*(j-1)/2*dp[i-1][j-2]+(ll)(i-1)*j*dp[i-2][j-1]+(ll)4*j*dp[i-1][j-1];
			dp[i][j]%=MOD;
		}
	}
	dp[H][W]+=MOD-1;
	dp[H][W]%=MOD;
	printf("%lld", dp[H][W]);
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &H, &W);
  ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	504 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	504 KB	Output is correct
4	Correct	3 ms	1144 KB	Output is correct
5	Correct	2 ms	632 KB	Output is correct
6	Correct	3 ms	1400 KB	Output is correct
7	Correct	2 ms	760 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	760 KB	Output is correct
10	Correct	3 ms	1784 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	4 ms	2168 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	504 KB	Output is correct
2	Correct	2 ms	376 KB	Output is correct
3	Correct	2 ms	504 KB	Output is correct
4	Correct	3 ms	1144 KB	Output is correct
5	Correct	2 ms	632 KB	Output is correct
6	Correct	3 ms	1400 KB	Output is correct
7	Correct	2 ms	760 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	760 KB	Output is correct
10	Correct	3 ms	1784 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	4 ms	2168 KB	Output is correct
13	Correct	2 ms	376 KB	Output is correct
14	Correct	9 ms	9720 KB	Output is correct
15	Correct	64 ms	55160 KB	Output is correct
16	Correct	6 ms	4088 KB	Output is correct
17	Correct	16 ms	12792 KB	Output is correct
18	Correct	20 ms	17016 KB	Output is correct
19	Correct	73 ms	63024 KB	Output is correct
20	Correct	59 ms	50856 KB	Output is correct
21	Correct	38 ms	33784 KB	Output is correct
22	Correct	40 ms	35400 KB	Output is correct
23	Correct	29 ms	27068 KB	Output is correct
24	Correct	86 ms	71004 KB	Output is correct
25	Correct	70 ms	61304 KB	Output is correct
26	Correct	77 ms	66808 KB	Output is correct
27	Correct	82 ms	69112 KB	Output is correct