commit solution S1812

Author: xiao2shiqi

README.md

@@ -5,6 +5,7 @@ LeetCode
 
 | # | Title | | Difficulty|
 |---| ----- | -------- | -------- |
+[1812][ Determine Color of a Chessboard Square](https://leetcode-cn.com/problems/determine-color-of-a-chessboard-square/) | [Java](https://github.com/xiao2shiqi/leetcode/blob/master/src/main/java/S1812.java)
 |1550|[Three Consecutive Odds](https://leetcode-cn.com/problems/three-consecutive-odds/) | [Go](https://github.com/xiao2shiqi/leetcode/blob/master/go/1550.go) | Easy
 |992|[Sort Array By Parity II](https://leetcode-cn.com/problems/sort-array-by-parity-ii/) | [Go](https://github.com/xiao2shiqi/leetcode/blob/master/go/992.go) | Easy
 |977|[Squares of a Sorted Array](https://leetcode-cn.com/problems/squares-of-a-sorted-array/) | [Go](https://github.com/xiao2shiqi/leetcode/blob/master/go/977.go) | Easy

src/main/java/S1812.java

@@ -0,0 +1,22 @@
+/**
+ * LC#1812：判断国际象棋棋盘中一个格子的颜色
+ * Link：https://leetcode-cn.com/problems/determine-color-of-a-chessboard-square/
+ * 思路1：将 8x8 按照奇偶数放入 Hash 中，然后根据 coordinates 获取结果值
+ * 思路2：根据规律可以预判出横轴坐标加纵轴坐标，直接返回结果即可
+ * @author Phoenix on 2021/7/3.
+ */
+public class S1812 {
+
+    public boolean squareIsWhite(String coordinates) {
+        int firstIndex = coordinates.charAt(0);
+        int lastIndex = coordinates.charAt(1);
+        return (firstIndex % 2) + (lastIndex % 2) == 1;
+    }
+
+    public static void main(String[] args) {
+        boolean squareIsWhite = new S1812().squareIsWhite("a3");
+        System.out.println(">>>");
+        System.out.println(squareIsWhite);
+
+    }
+}