poj 1644 概率dp

#include<cstdio>
#include<cstring>
#define MAX(x,y) ((x)>(y)?(x):(y))
#define INF 0x3f3f3f3f
double dp[60][60];
int d[60];
char str[60][60];
int main()
{
	int T;
	scanf("%d",&T);
	while(T--)
	{
		int m,t;
		char str[60];
		scanf("%d%d",&m,&t);
		memset(d,0,sizeof(d));
		for(int i=1;i<=m;i++)
		{
		    scanf("%s",str);
		    if(str[0]!='L') 
		    sscanf(str,"%d",&d[i]);
			else
			d[i]=INF;
		}
		memset(dp,0,sizeof(dp));
		dp[0][0]=1;
		d[m+2]=-1; 
		double ans=0;
		for(int i=0;i<t;i++)
		{
		   for(int j=0;j<=m;j++)
		   {
		       if(d[j+1]==INF)
			   	   dp[i+2][j+1]+=dp[i][j]*0.5;
			   else
			       dp[i+1][j+1+d[j+1]]+=dp[i][j]*0.5;
			    if(d[j+2]==INF)
			       dp[i+2][j+2]+=dp[i][j]*0.5;
			    else
			       dp[i+1][j+2+d[j+2]]+=dp[i][j]*0.5;
        	}
        	ans+=dp[i+1][m+1]; 
    	}
    	if(ans==0.5)
    	printf("Push. 0.5000\n");
    	else
    	if(ans>0.5)
    	printf("Bet for. %.4f\n",ans);
    	else
    	printf("Bet against. %.4f\n",ans);
	}
}