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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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