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  1. #include<iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define ll long long
  5. #define all(x) x.begin(),x.end()
  6.  
  7.  
  8. int genF(vector<int>&abx,char z,string &s){
  9.     //couting character z for a###b###zzz##zz
  10.     //couting character z for reverse(s)  c####b###zzzz..
  11.  
  12.     int ans=0;
  13.     int sz=abx[2];
  14.     while(sz<s.size()){
  15.         if(s[sz]==z){
  16.             ans++;
  17.         }
  18.         sz++;
  19.     }
  20.     return ans;
  21. }
  22. void pos(vector<int>&abx,string &s,string &t){
  23.  
  24.     //basic string matching 
  25.     int i=0;
  26.     int j=0;
  27.     while(i<t.size() && j<s.size()){
  28.         if(s[j]==t[i]){
  29.             abx.push_back(j);
  30.             i++,j++;
  31.         }
  32.         else{
  33.             j++;
  34.         }
  35.     }
  36. }
  37. void solve()
  38. {
  39.     // solve the question here
  40.     string s;
  41.     int n;
  42.     cin >> n >> s;
  43.     vector<int>abc;//the position for first occurences of a,b,c
  44.     vector<int>cba;//the position for last occurences of c,b,a
  45.     string t="abc";
  46.     string f="cba";
  47.     pos(abc,s,t);
  48.     reverse(all(s));
  49.     pos(cba,s,f);
  50.     if(abc.size()<3 && cba.size()<3){
  51.         //subsequence  abc is not found
  52.         cout<<0<<endl;
  53.         return;
  54.     }
  55.  
  56.     ll a1=INT_MAX;
  57.     ll s2=INT_MAX;
  58.  
  59.     if(cba.size()==3){
  60.         //deleting all a's
  61.         s2=genF(cba,'a',s);
  62.     }
  63.  
  64.     if(abc.size()==3){
  65.         //deleting all b's
  66.         reverse(all(s));
  67.         a1=genF(abc,'c',s);
  68.     }
  69.     ll ans=min(a1,s2);
  70.     cout<<ans<<endl;
  71.  
  72. }
  73. int main()
  74. {
  75.     int t;
  76.     cin>>t;
  77.     while(t--){
  78.         solve();
  79.     }
  80.     return 0;
  81. }
Success #stdin #stdout 0.07s 5304KB
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https://ideone.com/ZMOjsb
language:
C++ (gcc 8.3)
created:
188 days ago
visibility:
public

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