dsa_javascript/hacker_rank_practice.html at main · prakash-dev-code/dsa_javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <h2>Trades</h2>

    <script>
      // question 1
      // let A = [10, 20, 30, 40];
      let reverseA = [];
      for (let i = A.length - 1; i >= 0; i--) {
        reverseA[A.length - 1 - i] = A[i];
      }

      // question 2

      function solveMeFirst(a, b) {
        return Number(a + b);
        // Hint: Type return a+b below
      }

      // question 3

      function simpleArraySum(ar) {
        return ar.reduce((a, c) => a + c, 0);
        // Write your code here
      }

      let ar = [1, 2, 3, 4, 5];
      // console.log(simpleArraySum(ar));

      //       If a[i] > b[i], then Alice is awarded 1 point.
      // If a[i] < b[i], then Bob is awarded 1 point.
      // If a[i] = b[i], then neither person receives a point.

      function compareTriplets(a, b) {
        let a1 = 0;
        let b1 = 0;
        for (let i = 0; i < a.length; i++) {
          if (a[i] > b[i]) {
            a1++;
          } else if (a[i] < b[i]) {
            b1++;
          }
        }
        return [a1, b1];
      }
      // let a = [5, 6, 7];
      // let b = [3, 6, 10];
      // console.log(compareTriplets(a, b));

      // question 4

      // let array = [1000000001, 1000000002, 1000000003, 1000000004, 1000000005];

      function aVeryBigSum(ar) {
        return ar.reduce((a, c) => a + c, 0);
      }

      // console.log(aVeryBigSum(array));
      // question 5

      let matrix = [1, 2, 3, 4, 5, 6, 9, 8, 9];
      function diagonalDifference(arr) {
        let n = arr.length;
        let primary = 0;
        let secondary = 0;

        for (let i = 0; i < n; i++) {
          primary += arr[i][i]; // Left-to-right
          secondary += arr[i][n - i - 1]; // Right-to-left
        }

        return Math.abs(primary - secondary);
      }
      // question 6

      // There are  elements: two positive, two negative and one zero. Their ratios are ,  and . Results are printed as:

      let number = [-4, 3, -9, 0, 4, 1];
      function plusMinus(arr) {
        let positive = 0;
        let negative = 0;
        let zero = 0;
        let n = arr.length;
        for (let i = 0; i < n; i++) {
          if (arr[i] > 0) {
            positive++;
          } else if (arr[i] < 0) {
            negative++;
          } else {
            zero++;
          }
        }
        let positiveRatio = (positive / n).toFixed(6);
        let negativeRatio = (negative / n).toFixed(6);
        let zeroRatio = (zero / n).toFixed(6);
        return `${positiveRatio}\n${negativeRatio}\n${zeroRatio}`;
      }

      // console.log(plusMinus(number));

      function staircase(n) {
        let result = "";
        for (let i = 1; i <= n; i++) {
          let space = " ".repeat(n - i);
          let hash = "#".repeat(i);

          result += `${space}${hash}\n`;
        }
        return result;
      }

      // console.log(staircase(6));

      function miniMaxSum(arr) {
        let min = arr[0];
        let max = arr[0];
        let sum = 0;
        for (let i = 0; i < arr.length; i++) {
          sum += arr[i];
          if (arr[i] < min) {
            min = arr[i];
          }
          if (arr[i] > max) {
            max = arr[i];
          }
        }
        let minSum = sum - max;
        let maxSum = sum - min;
        return console.log(`${minSum} ${maxSum}`);
        // Write your code here
      }

      // let arr = [6, 2, 3, 4, 5];
      // console.log(miniMaxSum(arr));

      function birthdayCakeCandles(candles) {
        let max = Math.max(...candles);
        let count = 0;
        for (let i = 0; i < candles.length; i++) {
          if (candles[i] === max) {
            count++;
          }
        }
        return count;

        // Write your code here
      }

      // console.log(birthdayCakeCandles([3, 2, 1, 5, 9, 9]));

      function timeConversion(s) {
        let period = s.slice(-2);

        let timeParts = s.slice(0, -2).split(":");

        let [hours, minutes, seconds] = timeParts;

        let hoursNum = parseInt(hours);

        if (period === "PM") {
          if (hoursNum < 12) {
            hoursNum += 12;
          }
        } else {
          if (hoursNum === 12) {
            hoursNum = 0;
          }
        }

        hours = hoursNum.toString().padStart(2, "0");
        return `${hours}:${minutes}:${seconds}`;
      }

      function hourglassSum(arr) {
        let maxSum = -Infinity; // because numbers can be negative

        for (let i = 0; i <= 3; i++) {
          for (let j = 0; j <= 3; j++) {
            let top = arr[i][j] + arr[i][j + 1] + arr[i][j + 2];
            let mid = arr[i + 1][j + 1];
            let bottom = arr[i + 2][j] + arr[i + 2][j + 1] + arr[i + 2][j + 2];

            let sum = top + mid + bottom;
            maxSum = Math.max(maxSum, sum);
          }
        }

        return maxSum;
      }

      function rotateLeft(d, arr) {
        let n = arr.length;
        d = d % n;
        let rotatedArray = arr.slice(d).concat(arr.slice(0, d));
        return rotatedArray;
      }

      //  console.log(rotateLeft(4, [1, 2, 3, 4, 5]));

      // Question 7
      function gradingStudents(grades) {
        let result = [];
        for (let grade of grades) {
          let nextMultiple = Math.ceil(grade / 5) * 5;
          let difference = nextMultiple - grade;

          if (difference < 3 && grade >= 38) {
            result.push(nextMultiple);
          } else {
            result.push(grade);
          }
        }
        return result;
        // Write your code here
      }
      function countApplesAndOranges(s, t, a, b, apples, oranges) {
        let applesOnHouse = apples.filter((distance) => {
          let landingPosition = a + distance;
          return landingPosition >= s && landingPosition <= t;
        }).length;

        let orangesOnHouse = oranges.filter((distance) => {
          let landingPosition = b + distance;
          return landingPosition >= s && landingPosition <= t;
        }).length;
      }

      // Question ==>
      function kangaroo(x1, v1, x2, v2) {
        // Check if it's possible for them to meet
        if (v1 === v2) {
          return x1 === x2 ? "YES" : "NO";
        }

        const n = (x2 - x1) / (v1 - v2);

        // They meet only if `n` is a positive integer
        return n >= 0 && Number.isInteger(n) ? "YES" : "NO";
      }

      // Write your code here
      // console.log(kangaroo(0, 2, 5, 3)); // should return "YES"

      function getTotalX(a, b) {
        let lcm = (a) => {
          let gcd = (x, y) => (y === 0 ? x : gcd(y, x % y));
          return a.reduce((acc, val) => (acc * val) / gcd(acc, val), 1);
        };
        let gcd = (b) => {
          let gcd = (x, y) => (y === 0 ? x : gcd(y, x % y));
          return b.reduce((acc, val) => gcd(acc, val), b[0]);
        };
        let lcmA = lcm(a);
        let gcdB = gcd(b);
        let count = 0;
        for (let i = lcmA; i <= gcdB; i += lcmA) {
          if (gcdB % i === 0) {
            count++;
          }
        }
        return count;

        // Write your code here
      }

      // console.log(getTotalX([2, 4], [16, 32, 96]));
      // Question ==>

      function breakingRecords(scores) {
        let minCount = 0;
        let maxCount = 0;
        let minScore = scores[0];
        let maxScore = scores[0];
        for (let i = 1; i < scores.length; i++) {
          if (scores[i] > maxScore) {
            maxScore = scores[i];
            maxCount++;
          } else if (scores[i] < minScore) {
            minScore = scores[i];
            minCount++;
          }
        }
        return [maxCount, minCount];

        // Write your code here
      }

      // question ==>
      // console.log(breakingRecords([10, 5, 20, 20, 4, 5, 2, 25, 1]));

      function birthday(s, d, m) {
        let count = 0;
        const n = s.length;
        if (m > n) return 0;
        for (let i = 0; i <= n - m; i++) {
          let sum = 0;
          for (let j = 0; j < m; j++) {
            sum += s[i + j];
          }
          if (sum === d) {
            count++;
          }
        }
        return count;
      }
      // console.log(birthday([1, 2, 1, 3, 2], 3, 2)); // should return 2

      function divisibleSumPairs(n, k, ar) {
        let count = 0;
        for (let i = 0; i < n; i++) {
          for (let j = i + 1; j < n; j++) {
            if ((ar[i] + ar[j]) % k === 0) {
              count++;
            }
          }
        }
        return count;
      }

      // divisibleSumPairs(n,k,array)
      // console.log(divisibleSumPairs(6, 3, [1, 3, 2, 6, 1, 2]));

      function migratoryBirds(arr) {
        const counts = arr.reduce((acc, id) => {
          acc[id] = (acc[id] || 0) + 1;
          return acc;
        }, {});

        const maxFreq = Math.max(...Object.values(counts));

        return Math.min(
          ...Object.entries(counts)
            .filter(([_, freq]) => freq === maxFreq)
            .map(([id]) => Number(id))
        );
      }

      // console.log(migratoryBirds([1, 2, 3, 4, 5, 4, 3, 2, 1, 3, 4]));

      function matchingStrings(stringList, queries) {
        const sameLength = [];
        for (let i = 0; i < queries.length; i++) {
          let count = 0;
          for (let j = 0; j < stringList.length; j++) {
            if (queries[i] === stringList[j]) {
              count++;
            }
          }
          sameLength.push(count);
        }
        // Write your code here
        return sameLength;
      }

      // let sList = ["ab", "ab", "abc"];
      // let qList = ["ab", "abc", "bc"];

      // console.log(matchingStrings(sList, qList));

      function arrayManipulation(n, queries) {
        const arr = new Array(n + 2).fill(0); // extra space for b+1

        for (const [a, b, k] of queries) {
          arr[a] += k;
          arr[b + 1] -= k;
        }

        let max = 0;
        let current = 0;

        for (let i = 1; i <= n; i++) {
          current += arr[i];
          if (current > max) max = current;
        }

        return max;
      }

      // const n = 10;
      // const queries = [
      //   [1, 5, 3],
      //   [4, 8, 7],
      //   [6, 9, 1],
      // ];
      // console.log(arrayManipulation(n, queries));


      // console.log(printLinkedList(2));
      // console.log(printLinkedList(16));
      // console.log(printLinkedList(13));
      // console.log(printLinkedList(0));
    </script>
  </body>
</html>