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LeetCode_20.java
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LeetCode_20.java
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import java.util.Stack;
public class LeetCode_20 {
class Solution {
public boolean isValid(String s) {
Stack<Character> stack = new Stack<>();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == '(' || s.charAt(i) == '[' || s.charAt(i) == '{')
stack.push(s.charAt(i));
else {
if (stack.isEmpty()) {
return false;
}
if (s.charAt(i) == ')' && stack.peek() != '(')
return false;
if (s.charAt(i) == ']' && stack.peek() != '[')
return false;
if (s.charAt(i) == '}' && stack.peek() != '{')
return false;
stack.pop();
}
}
return stack.isEmpty();
}
}
}