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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.    // write your code here
  6.     int n,q;
  7.     cin>>n>>q;
  8.     string s;
  9.     cin>>s;
  10.     while(q--){
  11.        string c;
  12.         cin>>c;
  13.         if(c=="pop_back"){
  14.             int len = s.length();
  15.             if(len > 0)
  16.                 s.pop_back();
  17.            // cout<<c<<" "<<s<<endl;
  18.         }
  19.         else if(c=="front"){
  20.            // cout<<c<<" "<<s<<endl;
  21.             if(s.size() > 0)cout<<*s.begin()<<endl;
  22.         }
  23.         else if(c=="back"){
  24.             int len = s.length();
  25.             //cout<<c<<" "<<s<<endl;
  26.             if(s.size() > 0) cout<<s.back()<<endl;
  27.  
  28.         }
  29.         else if(c=="sort"){
  30.             int l1,r1, l, r; cin>>l1>>r1;
  31.             l = min(l1, r1);
  32.             r = max(l1, r1);
  33.             sort(s.begin()+l-1,s.begin()+r);
  34.            // cout<<c<<" "<<s<<endl;
  35.         }
  36.         else if(c=="reverse"){
  37.             int l,r,l1, r1; cin>>l1>>r1;
  38.             l = min(l1, r1);
  39.             r = max(l1, r1);
  40.             reverse(s.begin()+l-1,s.begin()+r);
  41.            // cout<<c<<" "<<s<<endl;
  42.         }
  43.         else if(c=="print"){
  44.             int pos; cin>>pos;
  45.            // cout<<c<<" "<<s<<endl;
  46.             if(pos > 0 && pos <= s.size())
  47.             cout<<s[pos-1]<<endl;
  48.         }
  49.         else if(c=="substr"){
  50.             int l1,r1, l, r; cin>>l1>>r1;
  51.             l = min(l1, r1);
  52.             r = max(l1, r1);
  53.             //cout<<c<<" "<<s<<endl;
  54.             for(int i = l - 1; i < r; i++){
  55.                 cout<<s[i];
  56.             }
  57.             cout<<"\n";
  58.         }
  59.         else if(c=="push_back"){
  60.            char x; cin>>x;
  61.            // cout<<c<<" "<<x<<" "<<s<<endl;
  62.            s.push_back(x);
  63.  
  64.         }
  65.  
  66.     }
  67.     return 0;
  68. }
Success #stdin #stdout 0s 5300KB
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stdout
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https://ideone.com/t9VWYc
language:
C++14 (gcc 8.3)
created:
34 days ago
visibility:
public

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