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Copy pathLeetCode_20_119.cpp
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Copy pathLeetCode_20_119.cpp
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39 lines (34 loc) · 1010 Bytes
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class Solution {
public:
bool isValid(string s) {
if (s.size() == 0) {
return true;
}
std::unordered_map<char,char> hash = {
{'(', ')'},
{'[', ']'},
{'{', '}'},
};
std::unordered_map<char,char>::iterator iter;
std::stack<char> test;
for (string::size_type i=0;i<s.size();i++) {
if (!test.empty()) {
iter = hash.find(test.top());
if (s[i] == iter->second) {
test.pop();
} else if (hash.find(s[i]) != hash.end()) {
test.push(s[i]);
} else {
return false;
}
} else {
if (hash.find(s[i]) != hash.end()) {
test.push(s[i]);
} else {
return false;
}
}
}
return test.empty();
}
};