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  1. #include <bits/stdc++.h>
  2. #define nl "\n"
  3.  
  4. using namespace std;
  5.  
  6. int main(){
  7.   #ifndef ONLINE_JUDGE
  8.   freopen("input.txt","r",stdin);
  9.   freopen("output.txt","w",stdout);
  10.   #endif
  11.   ios_base::sync_with_stdio(0);
  12.   cin.tie(0);
  13.   cout.tie(0);
  14.  
  15.  
  16.   int len,ope;
  17.   cin >> len >> ope;
  18.   string X;
  19.   cin >> X;
  20.   for(int i=0 ; i<=ope ; i++){
  21.     string que;
  22.     cin >> que;
  23.  
  24.     if(que == "substr"){
  25.       int pos1,pos2;
  26.       cin >> pos1 >> pos2;
  27.       int mi=min(pos1,pos2) ,ma=max(pos1,pos2);
  28.       cout << X.substr(mi-1,ma)<<nl;
  29.     } else if(que == "sort"){
  30.  
  31.       int pos1,pos2;
  32.       cin >> pos1 >> pos2;
  33.       int mi=min(pos1,pos2) ,ma=max(pos1,pos2);
  34.       sort(X.begin()+mi-1,X.begin()+ma);
  35.     } else if(que == "pop_back"){
  36.       X.pop_back();
  37.     } else if(que == "back"){
  38.       cout << X.back()<<nl;
  39.     } else if(que == "reverse"){
  40.       int pos1,pos2;
  41.       cin >> pos1 >> pos2;
  42.       pos1 -=1;
  43.       int mi=min(pos1,pos2) ,ma=max(pos1,pos2);
  44.       reverse(X.begin()+mi,X.begin()+ma);
  45.     } else if(que == "front"){
  46.       cout << X.front()<<nl;
  47.     } else if(que == "push_back"){
  48.       char ch;
  49.       cin >> ch;
  50.       X.push_back(ch);
  51.     } else if(que == "print"){
  52.       int pos;
  53.       cin >> pos;
  54.       cout << X[pos-1] <<nl;
  55.     }
  56.  
  57.   }
  58.  
  59.  
  60.   return 0 ;
  61. } 
  62.  
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/Kj1JxH
language:
C++ (gcc 8.3)
created:
21 hours ago
visibility:
public

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