Compilare: main.cpp: In member function 'int HLD::dfs1(int, int, int)': main.cpp:108:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: At global scope: main.cpp:217:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:19:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^