Valid Parentheses
Difficulty: EasyTopic: StringStackLeetcode:20.Valid ParenthesesGiven a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if:
- Open brackets must be closed by the same type of brackets.
- Open brackets must be closed in the correct order.
- Every close bracket has a corresponding open bracket of the same type.
Example 1:
Input: s = "()"
Output: true
Example 2:
Input: s = "()[]{}"
Output: true
Example 3:
Input: s = "(]"
Output: false
Constraints:
1 <= s.length <= 104sconsists of parentheses only'()[]{}'.
Solution
write solution in here
const parentheseMap = {
"(": ")",
"[": "]",
"{": "}"
}
/**
* @param {string} s
* @return {boolean}
*/
var isValid = function (s) {
const stack = []
for (let i = 0; i < s.length; i++) {
if (Object.keys(parentheseMap).includes(s[i])) {
stack.push(parentheseMap[s[i]])
} else {
const curr = stack.pop()
if (curr !== s[i]) {
return false
}
}
}
return stack.length === 0
};