Compilare: main.cpp: In function 'int main()': main.cpp:153:26: warning: unused variable 'nod' [-Wunused-variable] int n, m, i, u, v, ok, nod ; ^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:41:29: 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); ^