solve problem Complex Number Multiplication

Author: P-ppc

README.md

@@ -284,6 +284,7 @@ All solutions will be accepted!
 |223|[Rectangle Area](https://leetcode-cn.com/problems/rectangle-area/description/)|[java/py/js](./algorithms/RectangleArea)|Medium|
 |419|[Battleships In A Board](https://leetcode-cn.com/problems/battleships-in-a-board/description/)|[java/py/js](./algorithms/BattleshipsInABoard)|Medium|
 |129|[Sum Root To Leaf Numbers](https://leetcode-cn.com/problems/sum-root-to-leaf-numbers/description/)|[java/py/js](./algorithms/SumRootToLeafNumbers)|Medium|
+|537|[Complex Number Multiplication](https://leetcode-cn.com/problems/complex-number-multiplication/description/)|[java/py/js](./algorithms/ComplexNumberMultiplication)|Medium|
 
 # Database
 |#|Title|Solution|Difficulty|

algorithms/ComplexNumberMultiplication/README.md

@@ -0,0 +1,2 @@
+# Complex Number Multiplication
+This problem is easy to solve

algorithms/ComplexNumberMultiplication/Solution.java

@@ -0,0 +1,18 @@
+class Solution {
+    public String complexNumberMultiply(String a, String b) {
+        java.util.regex.Pattern pattern = java.util.regex.Pattern.compile("(.*)\\+(.*)i");
+        java.util.regex.Matcher matcher1 = pattern.matcher(a),
+                matcher2 = pattern.matcher(b);
+        matcher1.find();
+        matcher2.find();
+        int real1 = Integer.valueOf(matcher1.group(1)),
+            imaginary1 = Integer.valueOf(matcher1.group(2)),
+            real2 = Integer.valueOf(matcher2.group(1)),
+            imaginary2 = Integer.valueOf(matcher2.group(2));
+        
+        int real = real1 * real2 - imaginary1 * imaginary2,
+            imaginary = real1 * imaginary2 + real2 * imaginary1;
+        
+        return String.format("%d+%di", real, imaginary);
+    }
+}

algorithms/ComplexNumberMultiplication/solution.js

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+/**
+ * @param {string} a
+ * @param {string} b
+ * @return {string}
+ */
+var complexNumberMultiply = function(a, b) {
+    let [, real1, imaginary1] = a.match(/(.*)\+(.*)i/),
+        [, real2, imaginary2] = b.match(/(.*)\+(.*)i/),
+        real = parseInt(real1) * parseInt(real2) - parseInt(imaginary1) * parseInt(imaginary2),
+        imaginary = parseInt(real1) * parseInt(imaginary2) + parseInt(real2) * parseInt(imaginary1)
+    
+    return `${real}+${imaginary}i`
+};

algorithms/ComplexNumberMultiplication/solution.py

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+class Solution(object):
+    def complexNumberMultiply(self, a, b):
+        """
+        :type a: str
+        :type b: str
+        :rtype: str
+        """
+        pattern = re.compile(r'(.*)\+(.*)i')
+        real1, imaginary1 = pattern.match(a).groups()
+        real2, imaginary2 = pattern.match(b).groups()
+        
+        real = int(real1) * int(real2) - int(imaginary1) * int(imaginary2)
+        imaginary = int(real1) * int(imaginary2) + int(real2) * int(imaginary1)
+        return '%d+%di' % (real, imaginary)