Compilare: main.cpp: In function 'std::string getmin(std::string&, std::string&)': main.cpp:48:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for (int i = 0; i < a.size(); i++) | ~~^~~~~~~~~~ In file included from /usr/include/c++/12.2.1/cassert:44, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:33, from main.cpp:1: main.cpp: In function 'int main()': main.cpp:180:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 180 | assert(len < res.size()); | ~~~~^~~~~~~~~~~~