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- #include <iostream>
- #include<bits/stdc++.h>
- #define ll long long
- using namespace std;
- int main() {
- int n,q;
- string s;
- cin>>n>>q;
- cin>>s;
- string qu;
- int x,y;
- int pos;
- while(q--)
- {
- cin>>qu;
- if(qu == "pop_back")
- {
- s.pop_back();
- }
- else if( qu =="front ")
- {
- cout<<s.front()<<endl;
- }
- else if(qu =="back")
- {
- cout<<s.back()<<endl;
- }
- else if (qu =="sort")
- {
- cin>>x>>y;
- sort(s.begin() + min (x,y)-1 , s.begin() + max (x,y) );
- }
- else if("reverse")
- {
- cin>>x>>y;
- reverse(s.begin() + min (x,y)-1 , s.begin() + max (x,y) -1 );
- }
- else if("print")
- {
- cin>>pos;
- cout<<s[pos-1]<<endl;
- }
- else if ("substr")
- {
- cin>>x>>y;
- for(int i =min(x,y)-1 ;i<max(x,y)-1 ;i++)
- {
- cout<<s[i];
- }
- cout<<endl;
- }
- else
- {
- char m;
- cin>>m;
- s.push_back(m);
- }
- }
- return 0;
- }
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