#include<stdio.h>
int mian()
{
    int n,a,b,c,d,j,t;
        scanf("%d",&n);
        if(n==0)
            printf("0");
        if(n>0)
        {
            t=0;
            for(j=1;j<=n;j++)
            {
                a=j%5;
                b=j%25;
                c=j%125;
                d=j%625;
                if(a==0)
                {
                    if(b!=0&&c!=0&&d!=0)
                        t=t+1;
                    if(b==0&&c!=0&&d!=0)
                        t=t+2;
                    if(b==0&&c==0&&d!=0)
                        t=t+3;
                    if(a==0&&b==0&&c==0&&d==0)
                        t=t+4;
                }
            }
            printf("%d\n",t);
    }
    return 0;
}

#include<stdio.h>
int main()
{
    int n,a,b,c,d,i,t=0;
    scanf("%d",&n);
    if(n==0)
        printf("0\n");
    if(n>0)
    {
        for(i=1;i<=n;i++)
        {
            a=i%5;
            b=i%25;
            c=i%125;
            d=i%625;
            if(a==0&&b!=0&&c!=0&&d!=0)
                t=t+1;
            if(a==0&&b==0&&c!=0&&d!=0)
                t=t+2;
            if(a==0&&b==0&&c==0&&d!=0)
                t=t+3;   
            if(a==0&&b==0&&c==0&&d==0)
                t=t+4;
        }
        printf("%d\n",t);
    }
    return 0;
}
            

你是湖南农大的吗？？？

if(a==0)
                {
                    if(b!=0&&c!=0&&d!=0)
                        t=t+1;
                    if(b==0&&c!=0&&d!=0)
                        t=t+2;
                    if(b==0&&c==0&&d!=0)
                        t=t+3;
                    if(a==0&&b==0&&c==0&&d==0)
                        t=t+4;
                }
发生重复了，还有t=0,写在“int t=0”

如果是二十五，它的阶乘末尾有六个零！

比如说1！=1，所以末尾0的个数为0个！
5！=120有一个0；
就这个意思了