Compilare: main.cpp: In function 'void citire_listaad(int, std::vector<int>*)': main.cpp:25:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int j = 0; j < U[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void BFS(int)': main.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (int i = 0; i < U[a].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void bfs(int)': main.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int i = 0; i < U[a].size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'void DFS(int)': main.cpp:85:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 85 | for (int i = 0; i < U[a].size(); i++) { | ~~^~~~~~~~~~~~~