Identifying increasing trend in table using Javascript

Question

Identifying increasing trend in table using Javascript

Is it possible to achieve a strictly increasing sequence by eliminating at most one element from an array of integers? I have developed this code:

function almostIncreasingSequence(sequence) {

    let index;
    let count = 0;

    for (index = 1; index < sequence.length; index++) {
        
        if (sequence[index - 1] >= sequence[index]) {
            sequence.splice(index - 1, 1);
            count++;
            index = 0;
        } else if (sequence[index] > sequence[index + 1]) {
           sequence.splice(index + 1, 1);
            count++;
            index = 0;
        }
    }

    if (count > 1) {
        return false;
    } else {
        return true;
    }

}

However, there's an issue with the array [1, 2, 3, 4, 99, 5, 6]. Any ideas on how to fix this?

javascript arrays

Answer 1

Answer №1

You were very close to finding the solution! By utilizing the splice method, it is necessary to iterate through your array by following three key steps:

Eliminate one element at each step using splice.
Verify if the newly obtained array is sorted and return true if it is.
Reintegrate the removed element back into its original position, reconstructing the initial array.

The second step involves comparing pairs of elements within the arrays and halts as soon as it locates a pair such that sequence[i] > sequence[i + 1];

function checkIncreasingSequence(sequence) {

    for (let index = 0; index < sequence.length; ++index) {
        const eliminatedElement = sequence.splice(index, 1);
        let isSorted = true;

        for (let j = 0; j < sequence.length - 1; ++j) {

            if (sequence[j] > sequence[j + 1]) {
                isSorted = false;
                break;
            }

        }

        if (isSorted) { return true; }

        sequence.splice(index, 0, eliminatedElement);

    }

    return false;

}

console.log(checkIncreasingSequence([1, 2, 3, 4, 99, 5, 6]));

Answer 2

You were very close to finding the solution! By utilizing the splice method, it is necessary to iterate through your array by following three key steps:

Eliminate one element at each step using splice.
Verify if the newly obtained array is sorted and return true if it is.
Reintegrate the removed element back into its original position, reconstructing the initial array.

The second step involves comparing pairs of elements within the arrays and halts as soon as it locates a pair such that sequence[i] > sequence[i + 1];

function checkIncreasingSequence(sequence) {

    for (let index = 0; index < sequence.length; ++index) {
        const eliminatedElement = sequence.splice(index, 1);
        let isSorted = true;

        for (let j = 0; j < sequence.length - 1; ++j) {

            if (sequence[j] > sequence[j + 1]) {
                isSorted = false;
                break;
            }

        }

        if (isSorted) { return true; }

        sequence.splice(index, 0, eliminatedElement);

    }

    return false;

}

console.log(checkIncreasingSequence([1, 2, 3, 4, 99, 5, 6]));

Identifying increasing trend in table using Javascript

Answer №1

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