C++ EULER特徵數定理與UnionFind解Leetcode959 Regions Cut By Slashes

EULER特徵數定理與UnionFind解Leetcode959 Regions Cut By Slashes

EULER特徵數定理:平面連通圖有V-E+F

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Python C++解魔方陣Leetcode 840 Magic Squares In Grid

Python C++解魔方陣Leetcode 840  Magic Squares In Grid.

影片一開始就是展示如何解一個3x3的魔方陣，5總是在中心

In the beginning of film is to show how to solve a 3x3 magic square, 5 is always in the center.