本题难点就是判断有没有Bad placement，在每个连续区域中，我们把横纵坐标的最小值和最大值分别存下，若此区域是个矩形，则(mini,minj)～（maxi,maxj）的区域内必全部都是’#’，若不是则Bad placement。
chenbo LV 10
By signing up a OPS universal account, you can submit code and join discussions in all online judging services provided by us.
Using your OPS universal account
