Compilare: main.cpp: In function 'int bfs()': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;i++) ^~~ main.cpp:54:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' int sol; ^~~ main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[2*n+1].size();i++){ ~^~~~~~~~~~~~~~~~ main.cpp:54:13: warning: unused variable 'sol' [-Wunused-variable] int sol; ^~~