Compilare: main.cpp: In function 'int DFS(int, int)': main.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < tati[nod].size(); i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:32:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void creez_tati(int, int)': main.cpp:66:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[nod].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void lca(const std::vector<std::vector<int> >&, const std::vector<std::pair<int, int> >&)': main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < graph.size(); i++){ ~~^~~~~~~~~~~~~~ main.cpp:85:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < queries.size(); i++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:99:12: warning: unused variable 'y' [-Wunused-variable] int x, y; ^ main.cpp: In function 'int query(int, int)': main.cpp:58:1: warning: control reaches end of non-void function [-Wreturn-type] } ^