Compilare: user.cpp: In function ‘void read()’: user.cpp:21:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &k); ^ user.cpp:23:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &nr[i]); ^ user.cpp: In function ‘void solve()’: user.cpp:43:20: warning: ‘k’ is used uninitialized in this function [-Wuninitialized] if (bit2[i]%k) ^