Submission #3738

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
3738	2013-08-31T08:01:14 Z	cki86201	Hexagon travel (kriii1_H)	C++	1 / 1	180 ms	1404 KB

H

#include<stdio.h>
#include<algorithm>
#include<string.h>
#include<vector>
#include<math.h>
#include<stdlib.h>
using namespace std;

const int T = 1e9+7;
int Dp[2][4040][3][3];
int R,M;

int f()
{
	int i,j;
	for(i=0;i<=R;i++){Dp[0][i][0][2]=1-(i%2);Dp[0][i][0][1]=i%2;}
	for(i=1;i<=M;i++){
		Dp[1][0][0][1]=Dp[1][0][0][2]=Dp[1][0][1][0]=Dp[1][0][1][2]=Dp[1][0][2][0]=Dp[1][0][2][1]=0;
		if(i%3==0)Dp[1][0][0][2]=1;
		else if(i%3==1)Dp[1][0][2][1]=1;
		else Dp[1][0][1][0]=1;
		for(j=1;j<=R;j++){
			Dp[1][j][0][1]=(Dp[1][j-1][0][2]+Dp[0][j][2][0])%T;
			Dp[1][j][0][2]=(Dp[1][j-1][0][1]+Dp[0][j][1][0])%T;
			Dp[1][j][1][0]=(Dp[1][j-1][1][2]+Dp[0][j][2][1])%T;
			Dp[1][j][1][2]=(Dp[1][j-1][1][0]+Dp[0][j][0][1])%T;
			Dp[1][j][2][0]=(Dp[1][j-1][2][1]+Dp[0][j][1][2])%T;
			Dp[1][j][2][1]=(Dp[1][j-1][2][0]+Dp[0][j][0][2])%T;
		}
		for(j=0;j<=R;j++){
			Dp[0][j][0][1]=Dp[1][j][0][1];
			Dp[0][j][0][2]=Dp[1][j][0][2];
			Dp[0][j][1][0]=Dp[1][j][1][0];
			Dp[0][j][1][2]=Dp[1][j][1][2];
			Dp[0][j][2][0]=Dp[1][j][2][0];
			Dp[0][j][2][1]=Dp[1][j][2][1];
		}
	}
}

int read(int x)
{
	return (Dp[0][R][x][0]+Dp[0][R][x][1]+Dp[0][R][x][2])%T;
}

int tmp[2][4020],l,r;
int nCr()
{
	int i,j;
	tmp[0][0]=1;
	for(i=1;i<=l+r;i++){
		tmp[1][0]=1;
		for(j=1;j<=i;j++){
			tmp[1][j]=(tmp[0][j]+tmp[0][j-1])%T;
		}
		for(j=0;j<=i;j++)tmp[0][j]=tmp[1][j];
	}
	return tmp[0][l];
}

int main()
{
	scanf("%d%d%d",&l,&r,&M);
	R=l+r;
	f();
	int C = nCr();
	for(int i=2;i>=0;i--){
		int t=read(i);
		printf("%d\n",((long long)t*C)%T);
	}
	return 0;
}

Subtask #1

1.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	1404 KB	Output is correct
2	Correct	0 ms	1404 KB	Output is correct
3	Correct	0 ms	1404 KB	Output is correct
4	Correct	0 ms	1404 KB	Output is correct
5	Correct	0 ms	1404 KB	Output is correct
6	Correct	8 ms	1404 KB	Output is correct
7	Correct	0 ms	1404 KB	Output is correct
8	Correct	0 ms	1404 KB	Output is correct
9	Correct	8 ms	1404 KB	Output is correct
10	Correct	180 ms	1404 KB	Output is correct
11	Correct	100 ms	1404 KB	Output is correct
12	Correct	60 ms	1404 KB	Output is correct
13	Correct	16 ms	1404 KB	Output is correct
14	Correct	48 ms	1404 KB	Output is correct
15	Correct	48 ms	1404 KB	Output is correct
16	Correct	16 ms	1404 KB	Output is correct
17	Correct	56 ms	1404 KB	Output is correct
18	Correct	56 ms	1404 KB	Output is correct
19	Correct	20 ms	1404 KB	Output is correct
20	Correct	28 ms	1404 KB	Output is correct