sort, C++ (clang) - rextester

sort

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

int main()
{
    std::vector<std::pair<int, int>> 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   
    using T = std::pair<int, int>;
    std::sort(std::begin(x), std::end(x), [](const T& a, const T& b) {
        return a.first < b.first;
    });
    
    for(const auto& y : x)
        std::cout << y.first << ',' << y.second << '\n';
}


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