PTA_Have fun with numbers(C++)

 #include<iostream>
 #include<cstring>
 using namespace std;
 int main()
 {
     int z=;
     char fir[]="";
     int sec[]={},thi[]={},fo[]={};
     int len=;
     cin>>fir;
     len=strlen(fir);
     int len2=len;
     for(int i=;i<len;i++) sec[i]=fir[i]-'';
     int i=len-;
     for(i;i>;i--)
     {
         thi[i]=*sec[i]+z;
         z=thi[i]/;
         thi[i]%=;
     }
     int t=thi[i]; thi[i]=*sec[i]+z;
     if(t>=)
     {
         len2++;
         thi[i]=*sec[i]+z;
         fo[]=thi[i]/    ;
         thi[i]%=;
         for(int j=;j<len;j++) fo[j+]=thi[j];
     }
     else
     {
         thi[i]=*sec[i]+z;
         for(int j=;j<len2;j++) fo[j]=thi[j];
     }     z=;
     for(int k=;k<len2;k++)
     {
         for(int j=;j<len;j++)
         {
             if(sec[j]==fo[k]){sec[j]=;z=;break;}
         }
         if(z!=) {z=;break;}
         if(z==) z=;     }      if(z==)
     {
         cout<<"Yes"<<endl;
         for(int j=;j<len2;j++) cout<<fo[j];
     }
     if(z!=)
     {
         cout<<"No"<<endl;
         for(int j=;j<len2;j++) cout<<fo[j];
     }
     return ;
 }