Compilare: main.cpp: In function 'int main()': main.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; ++i) ~~^~~~~~~~~~~~~~~ main.cpp:67:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (i = 1; i <= M ; ++i) ^~~ main.cpp:69:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' memset(viz,false,sizeof(viz)); ^~~~~~