Compilare: main.cpp: In function 'int u(int, int)': main.cpp:80:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'char read_ch()': main.cpp:30:39: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(_in_buff, 1, 4096, _fin); ^