Compilare: main.cpp: In function 'void afisare(std::vector<std::vector<int> >)': main.cpp:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 1; i < ls.size(); i++) | ~~^~~~~~~~~~~ main.cpp:23:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int j = 0; j < ls[i].size(); j++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(std::vector<std::vector<int> >, int)': main.cpp:39:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < ls[s].size(); i++) | ~~^~~~~~~~~~~~~~