hdu 1250 简单大整数加法

#include<stdio.h>
#include<string.h>
#define N  3100
int a[N],b[N],c[N],d[N],e[N];
int main() {
   int n,i,j,k,t;
   while(scanf("%d",&n)!=EOF) {
  memset(a,0,sizeof(a));memset(c,0,sizeof(c));
  memset(b,0,sizeof(b));memset(d,0,sizeof(d));
  memset(e,0,sizeof(e));
  a[0]=1;b[0]=1;c[0]=1;d[0]=1;
  if(n==1||n==2||n==3||n==4) {
    printf("1\n");
    continue;
  }
    for(i=5;i<=n;i++) {
            k=0;
            memset(e,0,sizeof(e));
        for(j=0;j<=3000;j++) {
            t=a[j]+b[j]+c[j]+d[j]+k;
            k=t/10000;
            e[j]=t%10000;
        }
       for(j=0;j<=3000;j++) {
        a[j]=b[j];
        b[j]=c[j];
        c[j]=d[j];
        d[j]=e[j];
       }
    }
    k=0;
    for(i=3000;i>=0;i--) {
        if(k)
            printf("%04d",e[i]);
        else
        if(e[i]) {
            k=1;
            printf("%d",e[i]);
        }
    }
    printf("\n");
   }
return 0;
}