Submission #153362

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
153362	2019-09-13T17:04:39 Z	junodeveloper	Tents (JOI18_tents)	C++14	100 / 100	169 ms	35776 KB

tents

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
const int MOD=1e9+7;
int H,W;
int dp[3010][3010];
inline void add(int& a,int b) {
	a+=b;a%=MOD;
}
int main() {
	scanf("%d%d",&H,&W);
	int h,w;
	dp[0][0]=1;
	for(h=1;h<=H;h++) dp[h][0]=1;
	for(w=1;w<=W;w++) dp[0][w]=1;
	dp[1][1]=5;
	for(h=1;h<=H;h++) dp[h][1]=(h*4+h*(h-1)/2+1)%MOD;
	for(w=1;w<=W;w++) dp[1][w]=(w*4+w*(w-1)/2+1)%MOD;
	for(h=2;h<=H;h++) {
		for(w=2;w<=W;w++) {
			add(dp[h][w],dp[h-1][w]);
			add(dp[h][w],4ll*w*dp[h-1][w-1]%MOD);
			add(dp[h][w],(ll)w*(h-1)*dp[h-2][w-1]%MOD);
			add(dp[h][w],(ll)w*(w-1)/2%MOD*dp[h-1][w-2]%MOD);
		}
	}
	printf("%d",(MOD-1+dp[H][W])%MOD);
	return 0;
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:18:7: 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	3 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	3 ms	632 KB	Output is correct
6	Correct	3 ms	1272 KB	Output is correct
7	Correct	3 ms	760 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	888 KB	Output is correct
10	Correct	4 ms	1660 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	5 ms	1828 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 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	3 ms	632 KB	Output is correct
6	Correct	3 ms	1272 KB	Output is correct
7	Correct	3 ms	760 KB	Output is correct
8	Correct	3 ms	1400 KB	Output is correct
9	Correct	2 ms	888 KB	Output is correct
10	Correct	4 ms	1660 KB	Output is correct
11	Correct	2 ms	376 KB	Output is correct
12	Correct	5 ms	1828 KB	Output is correct
13	Correct	2 ms	376 KB	Output is correct
14	Correct	9 ms	9592 KB	Output is correct
15	Correct	116 ms	32936 KB	Output is correct
16	Correct	10 ms	2680 KB	Output is correct
17	Correct	28 ms	7976 KB	Output is correct
18	Correct	36 ms	11000 KB	Output is correct
19	Correct	139 ms	34620 KB	Output is correct
20	Correct	106 ms	29156 KB	Output is correct
21	Correct	72 ms	19800 KB	Output is correct
22	Correct	75 ms	22152 KB	Output is correct
23	Correct	49 ms	19676 KB	Output is correct
24	Correct	169 ms	35776 KB	Output is correct
25	Correct	130 ms	30772 KB	Output is correct
26	Correct	147 ms	33496 KB	Output is correct
27	Correct	161 ms	34728 KB	Output is correct