Compilare: main.cpp: In function 'void update(int, int, int, int, int)': main.cpp:67:24: warning: unused variable 'tmp' [-Wunused-variable] int mid=(st+dr)>>1,tmp; ^~~ main.cpp: In function 'void read(int&)': main.cpp:52:36: 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,dim,fin),pos=0; ^ main.cpp:57:40: 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,dim,fin),pos=0; ^