Compilare: main.cpp: In function 'int main()': main.cpp:83:25: warning: unused variable 'x' [-Wunused-variable] int q , k , i , j , x; ^ main.cpp:84:36: 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 , 5000000 , fin); ^