43 lines
820 B
C++
43 lines
820 B
C++
#include <string>
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#include <stack>
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/**
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* 20. Valid Parentheses
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* Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
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* An input string is valid if:
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* 1. Open brackets must be closed by the same type of brackets.
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* 2. Open brackets must be closed in the correct order.
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*/
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class Solution {
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public:
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static bool isValid(const std::string& s) {
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char pairs[256]{};
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'}'[pairs] = '{';
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']'[pairs] = '[';
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')'[pairs] = '(';
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std::stack<char> stack;
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for (char c : s) {
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switch (c) {
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case '(':
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case '[':
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case '{':
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stack.push(c);
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break;
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default:
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if (stack.empty() || pairs[c] != stack.top())
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return false;
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stack.pop();
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}
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}
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return stack.empty();
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}
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};
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int main() {
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int s[10];
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5[s] = 111;
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}
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