Submission #105262

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
105262	2019-04-11T05:13:50 Z	he_____he	Tents (JOI18_tents)	C++14	100 / 100	157 ms	70904 KB

tents

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

int readint(){
	int x=0,f=1; char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
	return x*f;
}

const int cys=1000000007;
int n,m;
ll d[3005][3005];

int mod(int x){return x>=cys?x-cys:x;}

ll qpow(ll x,ll p){
	ll ret=1;
	for(;p;p>>=1,x=x*x%cys) if(p&1) ret=ret*x%cys;
	return ret;
}

int main(){
	n=readint(); m=readint();
	for(int i=0;i<=m;i++) d[0][i]=1;
	for(int i=1;i<=n;i++){
		for(int j=0;j<=m;j++){
			if(i) d[i][j]=d[i-1][j];
			if(i&&j) d[i][j]=mod(d[i][j]+4*j*d[i-1][j-1]%cys);
			if(i&&j>1) d[i][j]=mod(d[i][j]+(j*(j-1)/2)%cys*d[i-1][j-2]%cys);
			if(i>1&&j) d[i][j]=mod(d[i][j]+(i-1)*j%cys*d[i-2][j-1]%cys);
		}
	}
	printf("%lld\n",mod(d[n][m]+cys-1));
	return 0;
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:37:36: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
  printf("%lld\n",mod(d[n][m]+cys-1));
                  ~~~~~~~~~~~~~~~~~~^

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	4 ms	512 KB	Output is correct
4	Correct	3 ms	1152 KB	Output is correct
5	Correct	2 ms	640 KB	Output is correct
6	Correct	3 ms	1408 KB	Output is correct
7	Correct	4 ms	896 KB	Output is correct
8	Correct	4 ms	1536 KB	Output is correct
9	Correct	2 ms	768 KB	Output is correct
10	Correct	4 ms	1792 KB	Output is correct
11	Correct	2 ms	380 KB	Output is correct
12	Correct	4 ms	2176 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	4 ms	512 KB	Output is correct
4	Correct	3 ms	1152 KB	Output is correct
5	Correct	2 ms	640 KB	Output is correct
6	Correct	3 ms	1408 KB	Output is correct
7	Correct	4 ms	896 KB	Output is correct
8	Correct	4 ms	1536 KB	Output is correct
9	Correct	2 ms	768 KB	Output is correct
10	Correct	4 ms	1792 KB	Output is correct
11	Correct	2 ms	380 KB	Output is correct
12	Correct	4 ms	2176 KB	Output is correct
13	Correct	2 ms	384 KB	Output is correct
14	Correct	9 ms	9728 KB	Output is correct
15	Correct	130 ms	55280 KB	Output is correct
16	Correct	11 ms	4096 KB	Output is correct
17	Correct	25 ms	12920 KB	Output is correct
18	Correct	32 ms	17144 KB	Output is correct
19	Correct	127 ms	63028 KB	Output is correct
20	Correct	100 ms	50940 KB	Output is correct
21	Correct	71 ms	33824 KB	Output is correct
22	Correct	65 ms	35544 KB	Output is correct
23	Correct	40 ms	27128 KB	Output is correct
24	Correct	147 ms	70904 KB	Output is correct
25	Correct	123 ms	61204 KB	Output is correct
26	Correct	139 ms	66652 KB	Output is correct
27	Correct	157 ms	69068 KB	Output is correct