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  1. #include<iostream>
  2. #include<math.h>
  3. #include<iomanip>
  4. #include <string>
  5. #include<algorithm>
  6.  
  7.  
  8. using namespace std;
  9.  
  10. void fast()
  11. {
  12.     ios_base::sync_with_stdio(0);
  13.     cin.tie(0);
  14.     cout.tie(0);
  15. }
  16. int main()
  17. {
  18.     fast();
  19.  
  20.     int size;
  21.     int numOfQ;
  22.     cin >> size >> numOfQ;
  23.  
  24.     string S;
  25.     cin >> S;
  26.  
  27.         for (int i = 0;i < numOfQ;i++) {
  28.             string query;
  29.             cin >> query;
  30.  
  31.             if (query == "pop_back") {
  32.                 S.pop_back();
  33.             }
  34.             else if (query == "front") {
  35.                 cout << S.front() << endl;
  36.             }
  37.             else if (query == "back") {
  38.                 cout << S.back() << endl;
  39.             }
  40.             else if (query == "sort") {
  41.                 int l, r;
  42.                 cin >> l >> r;
  43.                 sort(S.begin() + l - 1, S.begin() + r);
  44.             }
  45.             else if (query == "reverse") {
  46.                 int l, r;
  47.                 cin >> l >> r;
  48.                 reverse(S.begin() + l - 1, S.begin() + r);
  49.             }
  50.             else if (query == "print") {
  51.                 int pos;
  52.                 cin >> pos;
  53.                 cout << S[pos - 1] << endl;
  54.             }
  55.             else if (query == "substr") {
  56.                 int l, r;
  57.                 cin >> l >> r;
  58.                 cout << S.substr(l - 1, r - l + 1) << endl;
  59.             }
  60.             else if (query == "push_back") {
  61.                 char x;
  62.                 cin >> x;
  63.                 S.push_back(x);
  64.             }
  65.         }
  66.  
  67.  
  68.     return 0;
  69. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/xyqBor
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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