Compilare: user.cpp: In function ‘int myunion(int, int)’: user.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:29:16: warning: unused variable ‘a’ [-Wunused-variable] int n, k, p, a, b, i, x, y; ^ user.cpp:29:19: warning: unused variable ‘b’ [-Wunused-variable] int n, k, p, a, b, i, x, y; ^ user.cpp:30:30: 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:32:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &p, &x, &y); ^