Question

请检查以下代码并解释为什么当我在输入中多次提供相同的9位数电话号码时，for循环无限运行。我正在更改嵌套for循环中 numberData 的内容但不应该是一个问题，并且在 numberData 中嵌套for循环之后完成元素的推送，所以我我很困惑，为什么它的发生可以解释任何人：

    var str = "00:01:07,400-234-090\n00:05:01,701-080-080\n00:05:00,400-234-090\n00:01:06,701-080-080\n00:01:06,701-080-000"

    console.log(solution(str))

    function solution(S) {

        var totalCost = 0
        var lineArray = S.split('\n')

        var numberData = []
        /*{
            number = 0,
            duration = 0,
            cost = 0
        }*/


        console.log(lineArray)
        for (var i = 0; i < lineArray.length; i++) {

            console.log(lineArray.length, i);
            var dataArray = lineArray[i].split(',')
            var number = dataArray[1]
            var duration = dataArray[0]

            var timeArray = duration.split(':')

            var hours = +(timeArray[0])
            var min = +(timeArray[1])
            var sec = +(timeArray[2])

            var numberPresent = false
            var totalDuration = hours * 60 * 60 + min * 60 + sec //in Seconds
            var cost = 0;

            if (min < 5) {
                cost = min * 60 + sec
            } else {
                if (sec == 0)
                    cost = min * 150
                else
                    cost = (min + 1) * 150
            }

            for (var i = 0; i < numberData.length; i++) {
                if (numberData[i].number == number) {
                    numberData[i].duration += totalDuration
                    numberData[i].cost += cost
                    numberPresent = true
                }
            }
            if (!numberPresent)
                numberData.push({
                    number: number,
                    duration: totalDuration,
                    cost: cost
                })

        }

        var maxDurationIndex = 0
        totalCost += numberData[0].cost

        for (var i = 1; i < numberData.length; i++) {
            if (numberData[i].duration > numberData[maxDurationIndex])
                maxDurationIndex = i;

            if (numberData[i].duration == numberData[maxDurationIndex]) {
                var currentNumericNumber = getNumericNumber(numberData[i])
                var maxIndexNumber = getNumericNumber(numberData[maxDurationIndex])

                if (currentNumericNumber > maxIndexNumber)
                    maxDurationIndex = i;

            }
            totalCost += numberData[i].cost
        }

        totalCost = totalCost - (+numberData[maxDurationIndex].cost)

        return totalCost

        function getNumericNumber(numberString) {
            var numberArray = numberString.split('-')
            var string = '';

            for (var i = 0; i < numberArray.length; i++) {
                string += numberArray[i];
            }

            return +string;

        }


    }

您可以通过在输入中提供不同的电话号码来测试它，然后它可以完美运行。

Answer 1

您的内循环在外循环的每次迭代中将i的值重置为numberData.length。在numberData j上使用不同的内部循环变量，如for(var j=0; j<numberData.length; j++) { if(numberData[j].number == number) { numberData[j].duration+= totalDuration numberData[j].cost +=cost numberPresent = true } }

filter

或者只使用map和numberPresent = numberData.filter( s => s.number == number ).map( s => { s.duration += totalDuration; s.cost += cost; return s; }).length > 0

locate pyspark/find_spark_home.py

为什么第一个for循环内部的S函数在下面的节点js程序中无限运行？

1 个答案: