Compilare: main.cpp:125:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:154:13: warning: unused variable 'anc' [-Wunused-variable] int anc = lca(x, y); ^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: 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); ^