Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:54:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) ^ user.cpp:53:11: warning: unused variable ‘y’ [-Wunused-variable] int i,y; ^ user.cpp: In function ‘int main()’: user.cpp:73:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:59:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:42:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:16:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^