Compilare: user.cpp: In function ‘int main()’: user.cpp:25:13: warning: unused variable ‘val’ [-Wunused-variable] int val = 0, x = i, p = 0, u = -1; ^ 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:52:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^