斐波那契大数问题

#include <stdio.h>
int s[7500][670];
void solve()
{
    s[1][1] = 1;
	s[2][1] = 1;
    s[3][1] = 1;
	s[4][1] = 1;
    int i,j,k=0;
    for(i = 5;i<7500;i++)
    for( j = 1;j<=670 ;j++)
    {
        k += s[i-1][j]+s[i-2][j]+s[i-3][j]+s[i-4][j];
        s[i][j] = k%10000;
        k = k/10000;
    }
    while(k)
    {
        s[i][j++] = k%10000;
        k = k/10000;
    }
}
int main()
{
    int n,i,j;
    solve();
    while(scanf("%d",&n)!=EOF)
    {
        for(i = 670; i>=1;i--)
            if(s[n][i]!=0)
				break;
        printf("%d",s[n][i]);
        for(j = i-1;j>=1;j--)
            printf("%d",s[n][j]);
        printf("\n");
    }
	return 0;
}