Comments (2)
xiaoyuzdy
commented on July 21, 2024
如果swim()执行了，则pq数组和qp数组都变了，比如执行两次insert，insert(0,X)，insert(1,A),在插入第二条信息的时候满足keys[0]>keys[1]，交换数据，交换的是pq中记录的index，pq由原来的pq[1]=0,pq[2]=1变为pq[1]=1，pq[2]=0,由于qp是pq的逆序所以也要更新,由qp[0]=1,qp[1]=2变为qp[0]=2,qp[1]=1
https://github.com/xiaoyuzdy/Algorithms/blob/master/Algorithms/src/Number_2/IndexOfMinPQ_and_IndexOfMaxPQ.java
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LiBo430
commented on July 21, 2024
谢谢！我知道了，在exch方法里会使qp跟随pq变化而变化，因为只有需要exch的时候pq里的值才会移动。而qp只要始终满足qp[pq[i]] = i, qp[pq[j]] = j就行了。谢谢！
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