20. Valid Parentheses LeetCode
2016-02-12 13:02
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题意：给出一个只包括3种括号的字符串，问这个字符串中的括号排列是否合法。
题解：用stack来模拟一遍。最后判断stack是否为空就知道合不合法。
题解：用stack来模拟一遍。最后判断stack是否为空就知道合不合法。
class Solution {
public:
bool isValid(string s) {
int n = s.length();
stack<int> sta;
while(!sta.empty()) sta.pop();
for(int i = 0; i < n; i++)
{
if(sta.empty()) sta.push(i);
else
{
if((s[sta.top()] == '(' && s[i] == ')') || (s[sta.top()] == '[' && s[i] == ']') || (s[sta.top()] == '{' && s[i] == '}'))
sta.pop();
else sta.push(i);
}
}
if(!sta.empty()) return false;
else return true;
}
};
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