Guide to discovering an almost ascending sequence in an Array

I recently encountered a challenging algorithm problem that I need help with:

"I have a sequence of integers stored in an array. My task is to determine whether it is possible to obtain a strictly increasing sequence by removing no more than one element from the array.

For example, given the sequence [1, 3, 2, 1], the output should be: almostIncreasingSequence(sequence) = false;

In this case, there is no single element in the array that can be removed to achieve a strictly increasing sequence.

On the other hand, for the sequence [1, 3, 2], the output should be: almostIncreasingSequence(sequence) = true.

We can remove the number 3 from the array to get the strictly increasing sequence [1, 2]. Alternatively, removing 2 will also result in a strictly increasing sequence [1, 3]."

The Javascript code I used to tackle this problem was:

function almostIncreasingSequence(sequence) {
var count =0;

for (i =0 ; i<sequence.length-1 ; i++){
if (sequence[i+1]<=sequence[i]){
    count++;
   }
 }
return count <2;
}

However, when testing my code with the sequence [1,2,3,4,3,4,5], I realized it failed to provide the correct answer;

I am seeking guidance on an alternative algorithm that can effectively solve this problem. Can you please explain the steps clearly so that I can comprehend the process?

I apologize if my question isn't articulated well, as this is my first time reaching out here. Thank you for your understanding.

Answer №1

Perhaps this solution could be of assistance.

function identifyIncreasingSequence(sequence) {
    var sequenceExists = false;
    var clonedSequence = sequence.slice(); 
    main_seq: 
    for (var i = 0; i < clonedSequence.length; i++) { 
        sequence.splice(i,1); 
        s_seq: 
        for (var j = 0; j < clonedSequence.length-1; j++) { 
            if (sequence[j+1] <= sequence[j]) { 
                sequenceExists = false; 
                break s_seq; 
            }
            sequenceExists = true; 
        }
        sequence = clonedSequence.slice(); 
        if (sequenceExists) {break main_seq;}
    }
        return sequenceExists;
}

var testArray = [1,2,3,4,3,4,5];
var secondTest = [1,2,3,4,3,7,9];
var finalTest = [1,1];

console.log(identifyIncreasingSequence(testArray));
console.log(identifyIncreasingSequence(secondTest));
console.log(identifyIncreasingSequence(finalTest));

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