Doc n cap 'task priority' (task la chuoi, priority la int). Day tat ca vao SplPriorityQueue bang insert($task, $priority). Sau do extract toan bo (uu tien cao nhat ra truoc) va in moi task tren mot dong.
Dong 1: n. n dong: 'task priority'.
1 <= n <= 100, priority phan biet
n dong task theo thu tu uu tien giam dan.
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