Compilare: main.cpp: In function 'void dfs(int)': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < g[nod].size(); i++ ) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int _union(int, int)': main.cpp:59:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:84:7: warning: unused variable 'nod' [-Wunused-variable] int nod, nn, hase; ^~~ main.cpp:84:12: warning: unused variable 'nn' [-Wunused-variable] int nod, nn, hase; ^~ main.cpp:84:16: warning: unused variable 'hase' [-Wunused-variable] int nod, nn, hase; ^~~~