Compilare: main.cpp: In function 'std::vector<int> find_eulerian_cycle(std::unordered_map<int, std::vector<int> >&, int)': main.cpp:30:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i = 0; i < graph[stiva.top()].size(); i++){ | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~