Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:39:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[Q.front()].size();i++) ^ user.cpp: In function ‘void Construct(int)’: user.cpp:50:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[Q.front()].size();i++) ^ user.cpp: In function ‘void Reconstruct(int)’: user.cpp:65:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[Q.front()].size();i++) ^ user.cpp: In function ‘void Read(int&)’: user.cpp:24:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp:30:27: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp: In function ‘int main()’: user.cpp:79:19: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,IN); ^