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  1. /* MiraculousN*/
  2.  
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8.     string a,b;
  9.     cin>>a>>b;
  10.     int cnt=0;
  11.  
  12.     if(a.length()!=b.length())
  13.     cout<<"NO"<<"\n";
  14.  
  15.     else
  16.     {
  17.         vector<char>v;
  18.         set<char>st;
  19.  
  20.         for(int i=0;i<a.length();i++)
  21.         {
  22.             if(a[i]!=b[i])
  23.             {
  24.                 cnt++;
  25.                 if(cnt<=2)
  26.                 {
  27.                     v.push_back(a[i]);
  28.                     v.push_back(b[i]);
  29.                 }
  30.  
  31.             }
  32.  
  33.             st.insert(a[i]);
  34.         }
  35.  
  36.         if(cnt==2)
  37.         {
  38.             if(v[0]==v[3] && v[1]==v[2])
  39.             cout<<"YES"<<"\n";
  40.  
  41.             else
  42.             cout<<"NO"<<"\n";
  43.         }
  44.  
  45.         else if(cnt==0)
  46.         {
  47.             if(st.size()<a.length())
  48.             cout<<"YES"<<"\n";
  49.  
  50.             else
  51.             cout<<"NO"<<"\n";
  52.         }
  53.  
  54.         else
  55.         {
  56.             cout<<"NO"<<"\n";
  57.         }
  58.     }
  59.  
  60.  
  61.  
  62.  
  63.     return 0;
  64. }
Success #stdin #stdout 0.01s 5472KB
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stdin
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aba
aab
stdout
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YES
https://ideone.com/KdwJn6
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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