Question

How to sort a string with digits and letters (letters before digits) in C++

Answer 1

#include <iostream>
#include <algorithm>
 
int main() {
    std::string input = "d2c4b3a1";
 
    // Custom comparator: letters before digits
    std::sort(input.begin(), input.end(), [](char a, char b) {
        if (std::isalpha(a) && std::isdigit(b)) return true;
        if (std::isdigit(a) && std::isalpha(b)) return false;
        return a < b;
    });
 
    std::cout << "Custom sorted string: " << input << std::endl;
}
 
  
  
/*
run:
  
Custom sorted string: abcd1234
  
*/

 

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