> #include<stdio.h>
> 
> __int64 m;
> int n,a[100],b[100];
> 
> main(){
> 	char x[100];
> 	int tt,test,i,j;
> 	scanf("%d",&test);
> 	for (tt=1;tt<=test;tt++) {
> 		scanf("%d",&n);
> 		if (n>0) scanf("%s",x);
> 		for (i=n-1;i>=0;i--) {
> 			if (x[i]=='p') a[n-1-i]=1;
> 			else a[n-1-i]=-1;
> 		}
> 		scanf("%I64d",&m);
> 		for (i=0;i<n;i++) 
> 			if (m%2!=0) {
> 				m=(m-a[i])/2;
> 				b[i]=1;
> 			}
> 			else {
> 				b[i]=0;
> 				m=m/2;
> 			}
> 		if (m!=0) printf("Impossible\n");
> 		else {
> 			j=n-1;
> 			while (j>0 && b[j]==0) j--;
> 			for (i=j;i>=0;i--)
> 				printf("%d",b[i]);
> 			printf("\n");
> 		}
> 	}
> 	return 0;
> }

去掉这句话
while (j>0 && b[j]==0) j--;