LeetCode/cpp/valid-parentheses.cpp

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#include <string>
#include <vector>
class Solution {
public:
bool isValid(const std::string &s) {
std::vector<char> st;
for (auto c : s) {
switch (c) {
case '(':
st.push_back(')');
break;
case '{':
st.push_back('}');
break;
case '[':
st.push_back(']');
break;
default:
if (st.empty() || st.back() != c) {
return false;
}
st.pop_back();
break;
}
}
return st.empty();
}
};