23 lines
524 B
Swift
23 lines
524 B
Swift
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class Solution {
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func isValid(_ s: String) -> Bool {
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var stack: [Character] = []
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for c in s {
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switch c {
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case "(":
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stack.append(")")
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case "{":
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stack.append("}")
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case "[":
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stack.append("]")
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default:
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if (stack.popLast() != c) {
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return false
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}
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}
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}
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return stack.isEmpty
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}
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}
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