## 2021.11.27 LeetCode Question of the Day - Random Inversion Matrix

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Random inversion matrix
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Example
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Method: Array Mapping
Random inversion matrix
describe
You are given a binary matrix of m x n, and all values are initialized to zero. Please design an algorithm to randomly select one that satisfies Subscript of matrix[i][j] == 0 (i, j) and change its value to 1. Th ...

Posted by **gidiag** on *Tue, 30 Nov 2021 11:33:39 -0800*

## [experience summary] for the optimization of storage form, PTA 7-3 Icelanders

7-3 Icelanders (25 points)
Title Description
In the 2018 World Cup, Iceland became famous because of its 1-1 draw with the powerful Argentina. Good people find that Icelanders seem to have a "son" behind their names, so some netizens popularize science as follows:
Icelanders follow the old Viking patriarchal surname system. The ch ...

Posted by **nickcwj** on *Sun, 31 Oct 2021 01:47:53 -0700*