2019 Multi-University,Nowcoder Day 2
Problem A
Solved by Weaver_zhu && Kilo_5723. 01:36:01 (+2)
Problem B
Unsolved.
Problem C
Unsolved.
Problem D
Unsolved.
Problem E
Unsolved.
Problem F
Upsolved by Weaver_zhu. (-1)
Problem G
Unsolved.
Problem H
Solved by Xiejiadong. 03:43:42 (+2)
题意:求全 $1$ 的次大矩阵面积。
题解:考虑最大矩阵如何做,对于每一行考虑这一行作为底的最大矩形面积。
这个就变成了经典的最大广告牌问题,用单调栈维护每个位置向左向右最多能拓展的长度,即可算出最的矩形。
对于次大的矩形,考虑裁掉最大矩形的四个角,在分别算最大的矩形面积,取这四个中的较大值即可。
脑子不动,暗示 Weaver_zhu 写了三个小时的三分,于是这题爆炸了。
Problem I
Unsolved.
Problem J
Solved by Kilo_5723. 04:37:15 (+6)