Compilare: main.cpp: In function 'int main()': main.cpp:47:15: warning: variable 'c' set but not used [-Wunused-but-set-variable] long long c,n,m,i,j,t,k; ^ main.cpp:47:19: warning: unused variable 'm' [-Wunused-variable] long long c,n,m,i,j,t,k; ^ main.cpp:47:23: warning: unused variable 'j' [-Wunused-variable] long long c,n,m,i,j,t,k; ^ main.cpp: In function 'char read_ch()': main.cpp:23:33: 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); ^