Question

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

Answer 1

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
 
std::string extractName(const std::string& s) {
    size_t pos = s.find_last_of(' ');
     
    return s.substr(0, pos);
}
 
void printItems(const std::vector<std::string>& vec) {
    for (const auto& item : vec) {
        std::cout << item << "\n";
    }
}
 
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 extractName(a) < extractName(b);
        }
    );
 
    printItems(vec);
}
 
 
 
/*
run:
 
C 9
C# 6
C++ 5
Go 2
Java 1
PHP 7
Python 4
 
*/

 

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