Question

How to sort by numbers a mixed pair of string and number elements in a vector with C++

Answer 1

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

int extractNumber(const std::string& s) {
    size_t pos = s.rfind(' ');
    
    return std::stoi(s.substr(pos + 1));
}

int main() {
    std::vector<std::string> vec = {
        "Python 4", "C 9", "C++ 5", "C# 6",
        "Java 1", "PHP 7", "Go 2"
    };

    std::sort(vec.begin(), vec.end(),
        [](const std::string& a, const std::string& b) {
            return extractNumber(a) < extractNumber(b);
        }
    );

    for (const auto& s : vec)
        std::cout << s << "\n";
}



/*
run:

Java 1
Go 2
Python 4
C++ 5
C# 6
PHP 7
C 9

*/

 

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