Compilare: user.cpp: In function ‘int main()’: user.cpp:90:13: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int n, m, k; ^ user.cpp: In function ‘char get(FILE*)’: user.cpp:50:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, BUFFSIZE, f); ^