Compilare: main.cpp: In function 'std::vector<int> bfs(std::vector<std::vector<int> >&, int)': main.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i=0; i<lista[node].size(); i++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(std::vector<std::vector<int> >&, int, std::vector<bool>&)': main.cpp:40:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i=0; i<lista[start].size(); i++) | ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> kahn(std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:63:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int i = 1; i < grade_in.size(); i++) { | ~~^~~~~~~~~~~~~~~~~