添加 20. 有效的括号 Swift版本

This commit is contained in:
qiuxuewei
2021-11-26 14:26:01 +08:00
parent 5ffd1de55b
commit 009662f635

View File

@ -283,6 +283,29 @@ var isValid = function(s) {
};
```
Swift
```swift
func isValid(_ s: String) -> Bool {
var stack = [String.Element]()
for ch in s {
if ch == "(" {
stack.append(")")
} else if ch == "{" {
stack.append("}")
} else if ch == "[" {
stack.append("]")
} else {
let top = stack.last
if ch == top {
stack.removeLast()
} else {
return false
}
}
}
return stack.isEmpty
}
```
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<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>