Compilare: user.cpp: In function ‘int main()’: user.cpp:53:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(nr == 2) ^ user.cpp:17:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:20:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[i]); ^