编辑代码

#include <stdio.h>
#define prt printf
int main () {
      long long int n;
    while(scanf("%lld",&n)!=EOF){
      if(n==0)
      prt("1\n");
      else if(n%4==1)
      prt("%lld\n",n%10);
      else if(n%4==2)
      prt("%lld\n",n*n%10);
      else if(n%4==3)
      prt("%lld\n",n*n*n%10);
      else
      prt("%lld\n",n*n*n*n%10);
   }
}