Compilare: user.cpp: In function ‘char get_char()’: user.cpp:17:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(read,1,BUF,in); ^ user.cpp: In function ‘int main()’: user.cpp:151:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d\n",&n,&q); ^ user.cpp:155:27: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v[i]+1,Q,in); ^