Compilare: main.cpp: In function 'bool BFS(int, int)': main.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[Q.front()].size();i++) ~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:76:22: 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); ^ main.cpp: In function 'void Read(int&)': main.cpp:27:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f,MAX,1,IN),pos=0; ^ main.cpp:33:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f,MAX,1,IN),pos=0; ^