Compilare: user.cpp: In function ‘int main()’: user.cpp:11:13: warning: unused variable ‘t’ [-Wunused-variable] int n, m, t, i, k; ^ user.cpp:14:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &m); ^ user.cpp:19:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &a[k].x); ^