add binary

Author: sfmDev

Add Binary/Add Binary.py

@@ -0,0 +1,37 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+class Solution(object):
+    def addBinary(self, a, b):
+        """
+        :type a: str
+        :type b: str
+        :rtype: str
+        """
+        result = ""
+        sumVal = 0
+        achars = list(a)
+        bchars = list(b)
+        i = len(achars) - 1
+        j = len(bchars) - 1
+        evl = 0
+
+        while i >= 0 or j >= 0 or evl>0:
+            sumVal = evl
+            if i >= 0:
+                sumVal += int(achars[i])
+                i -= 1
+            if j >= 0:
+                sumVal += int(bchars[j])
+                j -= 1
+
+            evl = sumVal // 2
+            sumVal = sumVal % 2
+            result = str(sumVal) + result
+
+        return result
+
+
+a = Solution()
+b = a.addBinary('1','1')
+print(b)

Add Binary/Add Binary.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+/*
+ Given two binary strings, return their sum (also a binary string).
+ */
+class Solution {
+    func addBinary(_ a: String, _ b: String) -> String {
+        var result = ""
+        var sum = 0
+        let aChars = Array(a.characters)
+        let bChars = Array(b.characters)
+        var i = aChars.count - 1
+        var j = bChars.count - 1
+        var evl = 0
+
+        while i>=0 || j >= 0 || evl > 0 {
+            sum = evl // 进1位
+            if i>=0 {
+                sum += Int(String(aChars[i]))!
+                i -= 1
+            }
+            if j>=0 {
+                sum += Int(String(bChars[j]))!
+                j -= 1
+            }
+            // sum 0, 1, 2
+            // evl 0, 1
+            evl = sum / 2
+            sum = sum % 2
+            result = String(sum) + result
+        }
+
+        return result
+    }
+}
+
+let a = Solution()
+let b = a.addBinary("11", "10")
+
+
+
+
+