Compilare: main.cpp: In function 'void dfs(int, std::ofstream&)': main.cpp:21:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int k = 0; k < g[next].size(); ++k) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for (int j = 0; j < g[i].size(); ++j) | ~~^~~~~~~~~~~~~