Compilare: main.cpp: In function 'void dfs(int, std::vector<int>&, std::vector<std::vector<int> >&, std::vector<std::vector<std::pair<int, int> > >&, std::vector<int>&)': main.cpp:12:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 12 | if (st.size() <= o.first) { | ~~~~~~~~~~^~~~~~~~~~