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Matrix Data Structure Problem
I was thinking of this problem.
You have a matrix of size n by n (n<=10^5). You have to support q<=10^5 operations of 3 types (online):
Given (i, l, r, x), set a[i][l...r] to x
Given (l, r, x), set a[1...n][l...r] to x
Given (i, l, r), find the minimum of a[i][l...r]
Is there any way to support these operations efficiently?
