Compilare: main.cpp: In function 'int main()': main.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; ++ i) ~~^~~~~~~~~~~~~~~ main.cpp:30:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (!viz[nod]) ^~ main.cpp:39:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' viz[nod] = true; ^~~