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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #pragma GCC target ("avx2")
  4. #pragma GCC optimization ("O3")
  5. #pragma GCC optimization ("unroll-loops")
  6. #define all(x) x.begin(),x.end()
  7. #define ll long long int
  8. const int MAX = 1e6+7;
  9.  
  10. int main(int argc, char const *argv[])
  11. {
  12.     ios_base::sync_with_stdio(false);
  13.     cin.tie(0); cout.tie(0);
  14.  
  15.     int t; cin>>t;
  16.     while(t-->0)
  17.     {
  18.         int n,f = 0; cin>>n;
  19.         string s,t;
  20.         int cnt[26] = {0};
  21.         cin>>s>>t;
  22.  
  23.  
  24.         for(int i = 0;i<n;i++)
  25.         {
  26.             if(s[i]<t[i]) f = 1;
  27.             cnt[s[i]-'a']++;
  28.         }
  29.  
  30.         if(f)
  31.         {
  32.           cout<<-1<<'\n';
  33.           continue;
  34.          }
  35.  
  36.         vector<vector<int> > ans;
  37.         for(char ch = 'z';ch>='a';ch--)
  38.         {
  39.           vector<int> res;
  40.           int is_counted = 0;
  41.           for(int i = 0;i<n;i++)
  42.           {
  43.  
  44.             if(t[i] == ch && s[i]!=t[i])
  45.             {
  46.                if(cnt[ch-'a'] == 0){ f = 1; break; }
  47.                is_counted = 1;
  48.                res.push_back(i);
  49.                cnt[s[i]-'a']--;
  50.                s[i] = ch;
  51.                cnt[ch-'a']++;
  52.             }
  53.           }
  54.  
  55.           if(is_counted)
  56.           {
  57.             int np = 1;
  58.             for(int j = 0;j<n;j++)
  59.               if(s[j] == ch)
  60.               {
  61.                 np = 0;
  62.                 res.push_back(j);
  63.                 ans.push_back(res);
  64.                 break;
  65.               }
  66.  
  67.               if(np) f = 1;
  68.           }
  69.  
  70.         }
  71.  
  72.         if(f == 1 ){ cout<<-1<<'\n'; continue; }
  73.  
  74.         cout<<ans.size()<<'\n';
  75.         for(int j = 0;j<ans.size();j++)
  76.         {
  77.           cout<<ans[j].size()<<" ";
  78.           //sort(all(ans));
  79.           for(int i = 0;i<ans[j].size();i++) cout<<ans[j][i]<<" ";
  80.           cout<<'\n';
  81.         }
  82.  
  83.     }
  84.  
  85.   return 0;
  86. }
  87.  
Success #stdin #stdout 0s 4840KB
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https://ideone.com/P7PGjE
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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