Compilare: main.cpp: In function 'void BFS(int)': main.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[act].size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i = 1; i <= n; ++i) ^~~ main.cpp:47:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(i = 1; i <= m; ++i) { ^~~