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add binary #4
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26 changes: 0 additions & 26 deletions
src/0067_add_binary/README.md
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59 changes: 59 additions & 0 deletions
src/0067_add_binary/add_binary.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| 67. Add Binary | ||
| https://leetcode.com/problems/add-binary/ | ||
|
|
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| 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. | ||
|
|
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| Example: | ||
| Input: a = "11", b = "1" | ||
| Output: "100" | ||
| */ | ||
| // time: 2018年12月19日 | ||
|
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| package addbinary | ||
|
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| import ( | ||
| "strconv" | ||
| ) | ||
|
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| // Time complexity: O( max( len(a), len(b) ) ) | ||
| // Space complexity: O(1) | ||
| func addBinary(a string, b string) string { | ||
| var ( | ||
| lenA = len(a) | ||
| lenB = len(b) | ||
| carry int | ||
| res = "" | ||
| ) | ||
| for lenA > 0 && lenB > 0 { | ||
| tmp := int(a[lenA-1]-'0') + int(b[lenB-1]-'0') + carry | ||
| res = strconv.Itoa(tmp%2) + res | ||
| carry = tmp / 2 | ||
| lenA-- | ||
| lenB-- | ||
| } | ||
|
|
||
| if lenA == 0 { | ||
| for lenB > 0 { | ||
| tmp := int(b[lenB-1]-'0') + carry | ||
| res = strconv.Itoa(tmp%2) + res | ||
| carry = tmp / 2 | ||
| lenB-- | ||
| } | ||
| } | ||
|
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||
| if lenB == 0 { | ||
| for lenA > 0 { | ||
| tmp := int(a[lenA-1]-'0') + carry | ||
| res = strconv.Itoa(tmp%2) + res | ||
| carry = tmp / 2 | ||
| lenA-- | ||
| } | ||
| } | ||
|
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| if carry == 1 { | ||
| res = strconv.Itoa(carry) + res | ||
| } | ||
| return res | ||
| } |
33 changes: 33 additions & 0 deletions
src/0067_add_binary/add_binary_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| package addbinary | ||
|
|
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| import ( | ||
| "testing" | ||
| ) | ||
|
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| func TestAddBinary(t *testing.T) { | ||
| type arg struct { | ||
| a string | ||
| b string | ||
| } | ||
|
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| testCases := []arg{ | ||
| arg{ | ||
| a: "11", | ||
| b: "1", | ||
| }, | ||
| arg{ | ||
| b: "11", | ||
| a: "1", | ||
| }, | ||
| } | ||
|
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| expected := []string{ | ||
| "100", "100", | ||
| } | ||
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| for index, data := range testCases { | ||
| if res := addBinary(data.a, data.b); res != expected[index] { | ||
| t.Errorf("expected %s, got %s", expected[index], res) | ||
| } | ||
| } | ||
| } |
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