求大神看程序，谢谢！

#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<cstdio>
using namespace std;
const int MAXN=1000005;
char s[MAXN];
struct zz{
    int id;
    int yb;
}z[MAXN];
int main(){
    char tmp;
    int i,n,m;
    n=0;
    m=0;
    while(scanf("%c",&tmp)!=EOF)
    {
        if(tmp=='z'||tmp=='Z'||tmp=='y'||tmp=='Y')
            s[++m]=tmp;
    }
    for(i=1;i<=m;i++)
    {
        if(s[i]=='z'||s[i]=='Z')
        {
            z[n].id=n;
            n++;
        }
        if(s[i]=='y'||s[i]=='Y')
        {
            int j;
            for(j=0;j<n;j++)
                z[j].yb++;
        }
    }
    unsigned long long ans=0;
    for(i=0;i<n;i++)
        ans*=z[i].id*z[i].yb;
    cout<<ans;
    return 0;
}
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