Compilare: main.cpp: In function 'void DFS(int)': main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < answersLvL[father_].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < answersLvL[father_].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes[node].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nodes[head].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~