Compilare: main.cpp: In function 'void Sort(std::stack<int>&, std::stack<int>&, std::stack<int>&, int, bool)': main.cpp:59:28: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 59 | while (secondStack.size() > low1 && thirdStack.size() > low2) | ~~~~~~~~~~~~~~~~~~~^~~~~~ main.cpp:59:56: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 59 | while (secondStack.size() > low1 && thirdStack.size() > low2) | ~~~~~~~~~~~~~~~~~~^~~~~~ main.cpp:86:28: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 86 | while (secondStack.size() > low1) | ~~~~~~~~~~~~~~~~~~~^~~~~~ main.cpp:97:27: warning: comparison of integer expressions of different signedness: 'std::stack<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 97 | while (thirdStack.size() > low2) | ~~~~~~~~~~~~~~~~~~^~~~~~ main.cpp: In function 'int main()': main.cpp:126:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 126 | for (int i = 0; i < solution.size(); ++i) | ~~^~~~~~~~~~~~~~~~~