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Commit 1fa7e17

Browse files
feat: add swift implementation to lcci problem: No.16.26 (doocs#2770)
1 parent 1cfc3df commit 1fa7e17

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3 files changed

+120
-0
lines changed

3 files changed

+120
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lines changed

‎lcci/16.26.Calculator/README.md‎

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@@ -199,6 +199,47 @@ function calculate(s: string): number {
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}
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```
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```swift
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class Solution {
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func calculate(_ s: String) -> Int {
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let n = s.count
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var x = 0
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var sign: Character = "+"
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var stk = [Int]()
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let sArray = Array(s)
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for i in 0..<n {
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let c = sArray[i]
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if c.isNumber {
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x = x * 10 + Int(String(c))!
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}
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if i == n - 1 || (!c.isNumber && c != " ") {
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switch sign {
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case "+":
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stk.append(x)
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case "-":
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stk.append(-x)
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case "*":
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if let last = stk.popLast() {
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stk.append(last * x)
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}
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case "/":
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if let last = stk.popLast() {
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stk.append(last / x)
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}
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default:
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break
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}
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x = 0
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sign = c
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}
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}
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return stk.reduce(0, +)
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}
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}
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```
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<!-- tabs:end -->
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<!-- end -->

‎lcci/16.26.Calculator/README_EN.md‎

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@@ -209,6 +209,47 @@ function calculate(s: string): number {
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}
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```
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```swift
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class Solution {
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func calculate(_ s: String) -> Int {
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let n = s.count
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var x = 0
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var sign: Character = "+"
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var stk = [Int]()
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let sArray = Array(s)
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for i in 0..<n {
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let c = sArray[i]
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if c.isNumber {
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x = x * 10 + Int(String(c))!
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}
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if i == n - 1 || (!c.isNumber && c != " ") {
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switch sign {
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case "+":
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stk.append(x)
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case "-":
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stk.append(-x)
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case "*":
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if let last = stk.popLast() {
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stk.append(last * x)
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}
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case "/":
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if let last = stk.popLast() {
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stk.append(last / x)
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}
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default:
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break
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}
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x = 0
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sign = c
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}
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}
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return stk.reduce(0, +)
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}
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}
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```
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<!-- tabs:end -->
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<!-- end -->

‎lcci/16.26.Calculator/Solution.swift‎

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class Solution {
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func calculate(_ s: String) -> Int {
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let n = s.count
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var x = 0
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var sign: Character = "+"
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var stk = [Int]()
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let sArray = Array(s)
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for i in 0..<n {
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let c = sArray[i]
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if c.isNumber {
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x = x * 10 + Int(String(c))!
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}
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if i == n - 1 || (!c.isNumber && c != "") {
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switch sign {
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case "+":
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stk.append(x)
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case "-":
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stk.append(-x)
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case "*":
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if let last = stk.popLast() {
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stk.append(last * x)
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}
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case "/":
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if let last = stk.popLast() {
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stk.append(last / x)
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}
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default:
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break
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}
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x = 0
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sign = c
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}
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}
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return stk.reduce(0, +)
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}
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}

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