Submission #1695446


Source Code Expand

#include<stdio.h>
#include<cctype>
#include<algorithm>
using namespace std;
#define Maxn 3009
int read() {
	int x=0;char ch=getchar();
	while(!isdigit(ch)) ch=getchar();
	while(isdigit(ch)) {
		x=x*10+ch-48;
		ch=getchar();
	}
	return x;
}
int n,m,p,ans,f[Maxn][Maxn][2];
int main(){
	n=read();m=read();p=(int)(1e9+7);
	f[0][0][1]=1;
	for(int i=1;i<=n;++i) f[0][i][0]=1;
	for(int i=0;i<m;++i)
		for(int j=0;j<=n;++j)
			for(int k=0;k<=1;++k) {
				if(j) {
					(f[i+1][j-1][k|(j==1)]+=f[i][j][k])%=p;
					(f[i+1][j][k|(j==1)]+=f[i][j][k])%=p;
				}
				if(n-j) {
					(f[i+1][j][k]+=f[i][j][k])%=p;
					(f[i+1][j+1][k]+=f[i][j][k])%=p;
				}
			}
	int ans=0;
	for(int i=0;i<=n;++i) 
		(ans+=f[m][i][1])%=p;
	printf("%d\n",ans);
	return 0;
}

Submission Info

Submission Time
Task D - Piling Up
User qrsikno
Language C++14 (GCC 5.4.1)
Score 900
Code Size 778 Byte
Status AC
Exec Time 193 ms
Memory 70656 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 900 / 900
Status
AC × 3
AC × 33
Set Name Test Cases
Sample sample_01.txt, sample_02.txt, sample_03.txt
All sample_01.txt, sample_02.txt, sample_03.txt, sample_01.txt, sample_02.txt, sample_03.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt, subtask_1_18.txt, subtask_1_19.txt, subtask_1_20.txt, subtask_1_21.txt, subtask_1_22.txt, subtask_1_23.txt, subtask_1_24.txt, subtask_1_25.txt, subtask_1_26.txt, subtask_1_27.txt
Case Name Status Exec Time Memory
sample_01.txt AC 1 ms 128 KB
sample_02.txt AC 1 ms 256 KB
sample_03.txt AC 74 ms 69248 KB
subtask_1_01.txt AC 33 ms 14464 KB
subtask_1_02.txt AC 16 ms 27392 KB
subtask_1_03.txt AC 60 ms 68992 KB
subtask_1_04.txt AC 55 ms 38400 KB
subtask_1_05.txt AC 139 ms 61568 KB
subtask_1_06.txt AC 60 ms 68992 KB
subtask_1_07.txt AC 67 ms 64640 KB
subtask_1_08.txt AC 26 ms 45824 KB
subtask_1_09.txt AC 129 ms 70144 KB
subtask_1_10.txt AC 193 ms 70656 KB
subtask_1_11.txt AC 60 ms 64512 KB
subtask_1_12.txt AC 40 ms 40064 KB
subtask_1_13.txt AC 55 ms 68864 KB
subtask_1_14.txt AC 30 ms 60160 KB
subtask_1_15.txt AC 21 ms 21632 KB
subtask_1_16.txt AC 70 ms 69120 KB
subtask_1_17.txt AC 24 ms 33664 KB
subtask_1_18.txt AC 31 ms 29824 KB
subtask_1_19.txt AC 35 ms 68608 KB
subtask_1_20.txt AC 74 ms 69248 KB
subtask_1_21.txt AC 6 ms 27136 KB
subtask_1_22.txt AC 14 ms 68224 KB
subtask_1_23.txt AC 7 ms 35328 KB
subtask_1_24.txt AC 14 ms 68224 KB
subtask_1_25.txt AC 1 ms 256 KB
subtask_1_26.txt AC 14 ms 68224 KB
subtask_1_27.txt AC 1 ms 128 KB