USACO答案name that number

/*
ID: little71
 PROG: namenum
LANG: C++
*/
#include <iostream>
#include<string>
#include<fstream>
#include<cmath>
using namespace std;
  ifstream fin("namenum.in");
  ofstream fout("namenum.out");
 int main()
 {
 string N; fin>>N;
 int i, n=N.length();
 int a[n];
 bool flag=false;
 bool have=false;

 ifstream fin("dict.txt");
 string name;
 while(!flag)
 {
  fin>>name;
  if(fin.eof())break;
  if(n!=name.length())continue;
  for(i=0;i<n;++i)
  {
   if(name[i]=='Q'|| name[i]=='Z')a[i]=0;