HackerRank Js-Week2 2. Grading Students

    AllenLi
    HackerRank

    HackerLand University has the following grading policy:
    Each student has a grade between 0 and 100, inclusive.
    Any grade below 40 is a failing grade.
    Sam is a professor at a university and he likes to round each student’s grade according to the following rules:
    If the difference between the grade and the next multiple of 5 is less than 3, round to the next multiple of 5.
    If the grade value is less than 38, no rounding occurs because the result is still a failing grade.

    在 HackerLand 大學中有依據以下評分標準：

每一個學生的成績在 0 ~ 100 之間。
任何低於 40 分的成績都是不及格的。
Sam 是大學的教授，他喜歡根據以下規則對每個學生的成績進行四捨五入：
如果成績與下一個 5 的倍數之間差異小於 3，則四捨五入到下一個 5 的倍數。
如果成績小於 38，則不會進行四捨五入，因為結果是不及格。

    Example 1:

    grades = [73, 67, 38, 33]

    solution:
    遍歷 grades 陣列中的元素，依據以下條件：
    – 如果分數小於 38，則 continue。
    – 如果分數除以 5 後的餘數為 3，則代表該分數 + 2 會剛好等於 5 的倍數。
    – 如果分數除以 5 後的餘數為 4，則代表該分數 + 1 會剛好等於 5 的倍數。
    回傳 grades 陣列。

    Code 1: BigO(n)

    'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Complete the 'gradingStudents' function below.
 *
 * The function is expected to return an INTEGER_ARRAY.
 * The function accepts INTEGER_ARRAY grades as parameter.
 */

function gradingStudents(grades) {
    // Write your code here
    for (let i = 0; i < grades.length; i++) {
        
        //grades < 38, return
        if (grades[i] < 38){
            continue;
        } else {
            let temp = grades[i]
            let remainder = grades[i] % 5
            
            //grades % 5 < 3, remove 5 multiple
            if (remainder === 3) {
                temp = temp + 2
                grades[i] = temp   
            } else if (remainder === 4) {
                temp = temp + 1
                grades[i] = temp
            }
        }
    }
    return grades;
}
    

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    const gradesCount = parseInt(readLine().trim(), 10);

    let grades = [];

    for (let i = 0; i < gradesCount; i++) {
        const gradesItem = parseInt(readLine().trim(), 10);
        grades.push(gradesItem);
    }

    const result = gradingStudents(grades);

    ws.write(result.join('\n') + '\n');

    ws.end();
}

    FlowChart:
    Example 1

    grades = [73, 67, 38, 33]

73 % 5 = 3 //73 + 2 = 75
67 % 5 = 2 //67
38 //38
33 //33

return [75, 67, 40, 33];

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