Compilare: user.cpp: In function ‘bool ok(int)’: user.cpp:19:9: warning: statement has no effect [-Wunused-value] for (i; i <= m; i++) { ^ user.cpp: In function ‘int main()’: user.cpp:31:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &m); ^ user.cpp:33:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &a[i]); ^