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feat: add swift implementation to lcci problem: No.17.04 #2772

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merged 5 commits into from
May 9, 2024
Merged

feat: add swift implementation to lcci problem: No.17.04 #2772

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abc2486
Swift Implementation for LCCI 17.04
klever34 May 9, 2024
09b421b
Update and rename Solution.swift to Solution2.swift
yanglbme May 9, 2024
a9b069d
Update README_EN.md
yanglbme May 9, 2024
f5bca31
Update README.md
yanglbme May 9, 2024
4cadb7e
Create Solution.swift
yanglbme May 9, 2024
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Update README.md
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@yanglbme
yanglbme authored May 9, 2024
commit f5bca310fd23714f44259dc11c1f8a4bf7a74f8d
20 changes: 16 additions & 4 deletions lcci/17.04.Missing Number/README.md
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Expand Up @@ -122,10 +122,13 @@ var missingNumber = function (nums) {
```swift
class Solution {
func missingNumber(_ nums: [Int]) -> Int {
let n = nums.count
let expectedSum = n * (n + 1) / 2
let actualSum = nums.reduce(0, +)
return expectedSum - actualSum
let nums = nums.sorted()
for (i, x) in nums.enumerated() {
if i != x {
return i
}
}
return nums.count
}
}
```
Expand Down Expand Up @@ -217,6 +220,15 @@ var missingNumber = function (nums) {
};
```

```swift
class Solution {
func missingNumber(_ nums: [Int]) -> Int {
let n = nums.count
return n * (n + 1) / 2 - nums.reduce(0, +)
}
}
```

<!-- tabs:end -->

### 方法三：位运算
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