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  1. #include<iostream>
  2. #include<set>
  3. #define ll long long
  4. using namespace std;
  5. int main()
  6. {   ll iter,N,limit,T,K,i,count,indexa,indexb,flag;
  7.     cin>>T;
  8.     while(T--)
  9.     {   
  10.         cin>>N;
  11.         string A,B;
  12.         cin>>A>>B;
  13.         set<ll>ai,bi;
  14.         flag=0;
  15.         for(i=0;i<N;i++){
  16.             if(B[i]!=A[i] && int(A[i])<int(B[i]))
  17.             {
  18.                 flag=1;
  19.                 break;
  20.             }
  21.         }
  22.         count=0;
  23.         for(i=0;i<N;i++){
  24.             if(A[i]!=B[i]){
  25.                 count++;
  26.             }
  27.         }
  28.         ll counta=0,countb=0;
  29.         for(i=0;i<N;i++){
  30.         	if(A[i]=='a')
  31.         	counta++;
  32.         	else if(A[i]=='b')
  33.         	countb++;
  34.         }
  35.         if(flag==1 || counta==0 || countb==0){
  36.             cout<<-1<<"\n";
  37.         }
  38.         else if(count=0)
  39.         cout<<0;
  40.         else{
  41.         	ll gotb=0;ll gota=0;
  42.         	for(i=0;i<N;i++){
  43.             if(A[i]=='a' && gota==0)
  44.             {
  45.             	gota=1;ai.insert(i);
  46.             }
  47.  
  48.             else if(A[i]=='b' && gotb==0)
  49.             {
  50.             bi.insert(i);gotb=1;	
  51.             }
  52.         }
  53.         for(i=0;i<N;i++){
  54.             if(B[i]!=A[i])
  55.             {
  56.             	if(B[i]=='a')
  57.             	 ai.insert(i);
  58.             else if(B[i]=='b')
  59.             bi.insert(i);
  60.  
  61.             }
  62.  
  63.  
  64.         }    
  65.         cout<<2<<"\n";
  66.         cout<<ai.size()<<"\t";
  67.         for(ll x:ai)
  68.         cout<<x<<"\t";
  69.         cout<<"\n";
  70.         cout<<bi.size()<<"\t";
  71.         for(ll x:bi)
  72.         cout<<x<<"\t";
  73.         cout<<"\n";
  74.         }
  75.     }
  76.     return 0;
  77. }
  78.  
  79.  
  80.  
  81.  
Success #stdin #stdout 0s 4500KB
comments (?)
stdin 
5
abcde 
aabaa
stdout 
2
2 1 2 
2 0 1
https://ideone.com/Sfn5Ak
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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