Compilare: user.cpp: In function ‘void DFS1(int, int)’: user.cpp:38:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph1[node].size();i++) ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph2[node].size();i++) ^ user.cpp: In function ‘void Read(int&)’: user.cpp:26:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,IN),pos=0; ^ user.cpp:32:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,IN),pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:87:22: 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); ^