Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.
Solution1:
public class Solution {
public boolean isValid(String s) {
Stack stack = new Stack();
for (char c : s.toCharArray()) {
if (c == '(') {
stack.push(')');
} else if (c == '[') {
stack.push(']');
} else if (c == '{') {
stack.push('}');
} else if (stack.isEmpty() || stack.pop() != c) {
return false;
}
}
return stack.isEmpty();
}
}
标签：Parentheses,20,valid,else,Valid,isEmpty,push,stack From： https://www.cnblogs.com/MarkLeeBYR/p/16853535.html