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[LeetCode] Valid Parenthese 본문

PS/LeetCode

[LeetCode] Valid Parenthese

판교토끼 2020. 4. 15. 15:37

https://leetcode.com/problems/valid-parentheses/

 

Valid Parentheses - LeetCode

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leetcode.com

괄호가 유효한지 검사하는 전형적인 stack 문제이다.

class Solution {
public:
    bool isValid(string s) {
        stack<char>* sc = new stack<char>();
        
        for(int i=0;i<s.length();i++) {
            switch(s[i]) {
                case '(':
                    sc->push(s[i]);
                    break;
                case '{':
                    sc->push(s[i]);
                    break;
                case '[':
                    sc->push(s[i]);
                    break;
                case ')':
                    if(sc->size()<1)
                        return false;
                    if(sc->top()=='(') {
                        sc->pop();
                        break;
                    }
                    else
                        return false;
                case '}':
                    if(sc->size()<1)
                        return false;
                    if(sc->top()=='{') {
                        sc->pop();
                        break;
                    }
                    else
                        return false;
                case ']':
                    if(sc->size()<1)
                        return false;
                    if(sc->top()=='[') {
                        sc->pop();
                        break;
                    }
                    else
                        return false;
            }
        }
        if(sc->size()>0)
            return false;
        return true;
    }
};
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