Coding Test

쇠막대기

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function solution(arrangement) {

    var answer = 0;
    var stack = 0;
    for (let i = 0; i < arrangement.length; i++) {
        if (arrangement[i] === '(' && arrangement[i + 1] === ')') {
            answer += stack;
            i++
        } else if (arrangement[i] === '(') {
            stack++
        } else {
            stack--
            answer += 1
        }
    }
    return answer
}

centuryFromYear

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function centuryFromYear(year) {
    return Math.ceil(year / 100)
}

checkPalindrome

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function checkPalindrome(inputString) {
    return inputString == inputString.split('').reverse().join('');
}

adjacentElementsProduct

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function adjacentElementsProduct(arr) {
    return Math.max(...arr.slice(1).map((x, i) => [x * arr[i]]))
}

shapeArea

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function shapeArea(n) {
    return n*n + (n-1)*(n-1);
}

Make array consecutive 2

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function makeArrayConsecutive2(statues) {
    return Math.max(...statues) - Math.min(...statues) + 1 - statues.length
}

almostIncreasingSequence

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function almostIncreasingSequence(seq) {
    var bad = 0
    for (var i = 1; i < seq.length; i++) if (seq[i] <= seq[i - 1]) {
        bad++
        if (bad > 1) return false
        if (seq[i] <= seq[i - 2] && seq[i + 1] <= seq[i - 1]) return false
    }
    return true
}

matrixElementsSum

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function matrixElementsSum(matrix) {
    var total = 0;

    for (j = 0; j < matrix[0].length; j++) {
        for (var i = 0; i < matrix.length; i++) {
            if (matrix[i][j] === 0) break
            else total += matrix[i][j]
        }
    }
    return total
}