poj 3748 位操作

#include<iostream>#include<string>using namespace std;int main(){ int a,x,y,i; char s[32]; cin>>a; getchar(); cin>>x; getchar(); cin>>y; for(i=0; i<=31; i++)  s[i]=0;  i=31; int j; while(a!=0) {  int t=a%10;  j=i;  while(t!=0)  {   s[i]=t%2;    t=t/2;   i--;  }  i=j-4;  a=a/10; }  s[31-x]=0; s[31-y]=1; s[31-y+1]=1;s[31-y+2]=0;  int sum=0; for(i=0; i<=31; i++)  sum=sum*2+s[i];   printf("%xn",sum); return 0;}