Question

How to circularly rotate a string to left by N places in C++

Answer 1

#include <string>
#include <iostream>
 
int main()
{
    std::string str = "ExMachina";
    
    int lenstr = str.length();
    int N = 3;
  
    std::string left_rotation = str.substr(N) + str.substr(0, N) ;

    std::cout << left_rotation;
}
 
 
 
 
/*
run:
 
achinaExM
 
*/

 

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Answer 2

#include <string>
#include <iostream>
#include <algorithm>
  
int main()
{
    std::string str = "ExMachina";
    int N = 3;

    rotate(str.begin(), str.begin() + N, str.end());

    std::cout << str;
}
  
  
  
  
/*
run:
  
achinaExM
  
*/

 

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