Compilare: user.cpp: In function ‘void Read()’: user.cpp:18:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void BFS()’: user.cpp:42:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++) ^ user.cpp: In function ‘void Print()’: user.cpp:74:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:74:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:89:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("viteza2.out","w",stdout); ^