添加 18 题

leetcode/0067.Add-Binary/67. Add Binary.go

@@ -0,0 +1,38 @@
+package leetcode
+
+import (
+	"strconv"
+	"strings"
+)
+
+func addBinary(a string, b string) string {
+	if len(b) > len(a) {
+		a, b = b, a
+	}
+
+	res := make([]string, len(a)+1)
+	i, j, k, c := len(a)-1, len(b)-1, len(a), 0
+	for i >= 0 && j >= 0 {
+		ai, _ := strconv.Atoi(string(a[i]))
+		bj, _ := strconv.Atoi(string(b[j]))
+		res[k] = strconv.Itoa((ai + bj + c) % 2)
+		c = (ai + bj + c) / 2
+		i--
+		j--
+		k--
+	}
+
+	for i >= 0 {
+		ai, _ := strconv.Atoi(string(a[i]))
+		res[k] = strconv.Itoa((ai + c) % 2)
+		c = (ai + c) / 2
+		i--
+		k--
+	}
+
+	if c > 0 {
+		res[k] = strconv.Itoa(c)
+	}
+
+	return strings.Join(res, "")
+}

leetcode/0067.Add-Binary/67. Add Binary_test.go

@@ -0,0 +1,48 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question67 struct {
+	para67
+	ans67
+}
+
+// para 是参数
+// one 代表第一个参数
+type para67 struct {
+	a string
+	b string
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans67 struct {
+	one string
+}
+
+func Test_Problem67(t *testing.T) {
+
+	qs := []question67{
+
+		question67{
+			para67{"11", "1"},
+			ans67{"100"},
+		},
+
+		question67{
+			para67{"1010", "1011"},
+			ans67{"10101"},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 67------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans67, q.para67
+		fmt.Printf("【input】:%v       【output】:%v\n", p, addBinary(p.a, p.b))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0067.Add-Binary/README.md

@@ -0,0 +1,76 @@
+# [67. Add Binary](https://leetcode.com/problems/add-binary/)
+
+
+## 题目
+
+Given two binary strings, return their sum (also a binary string).
+
+The input strings are both **non-empty** and contains only characters `1` or `0`.
+
+**Example 1**:
+
+```
+Input: a = "11", b = "1"
+Output: "100"
+```
+
+**Example 2**:
+
+```
+Input: a = "1010", b = "1011"
+Output: "10101"
+```
+
+## 题目大意
+
+给你两个二进制字符串，返回它们的和（用二进制表示）。输入为 非空 字符串且只包含数字 1 和 0。
+
+## 解题思路
+
+- 要求输出 2 个二进制数的和，结果也用二进制表示。
+- 简单题。按照二进制的加法规则做加法即可。
+
+## 代码
+
+```go
+
+package leetcode
+
+import (
+	"strconv"
+	"strings"
+)
+
+func addBinary(a string, b string) string {
+	if len(b) > len(a) {
+		a, b = b, a
+	}
+
+	res := make([]string, len(a)+1)
+	i, j, k, c := len(a)-1, len(b)-1, len(a), 0
+	for i >= 0 && j >= 0 {
+		ai, _ := strconv.Atoi(string(a[i]))
+		bj, _ := strconv.Atoi(string(b[j]))
+		res[k] = strconv.Itoa((ai + bj + c) % 2)
+		c = (ai + bj + c) / 2
+		i--
+		j--
+		k--
+	}
+
+	for i >= 0 {
+		ai, _ := strconv.Atoi(string(a[i]))
+		res[k] = strconv.Itoa((ai + c) % 2)
+		c = (ai + c) / 2
+		i--
+		k--
+	}
+
+	if c > 0 {
+		res[k] = strconv.Itoa(c)
+	}
+
+	return strings.Join(res, "")
+}
+
+```