JS查找数组中的所有序列

function findIncreasingSequences(arr) {
    let result = [];
    let currentSequence = [];

    for (let i = 0; i < arr.length; i++) {
        if (currentSequence.length === 0 || arr[i] > currentSequence[currentSequence.length - 1]) {
            currentSequence.push(arr[i]);
        } else {
            if (currentSequence.length >= 2) {
                result.push([...currentSequence]);
            }
            currentSequence = [arr[i]];
        }
    }

    if (currentSequence.length >= 2) {
        result.push([...currentSequence]);
    }

    return result;
}

// 示例用法
const array = [1, 3, 5, 2, 4, 6, 8, 7];
console.log(findIncreasingSequences(array));
// 输出: [[1, 3, 5], [2, 4, 6], [7, 8]]

function findSequences(arr) {
    let result = [];
    let currentSequence = [];
    let isIncreasing = true;

    for (let i = 0; i < arr.length; i++) {
        if (currentSequence.length === 0 || (isIncreasing && arr[i] > currentSequence[currentSequence.length - 1]) || (!isIncreasing && arr[i] < currentSequence[currentSequence.length - 1])) {
            currentSequence.push(arr[i]);
        } else {
            if (currentSequence.length >= 2) {
                result.push([...currentSequence]);
            }
            currentSequence = [arr[i]];
            isIncreasing = !isIncreasing;
        }
    }

    if (currentSequence.length >= 2) {
        result.push([...currentSequence]);
    }

    return result;
}

// 示例用法
const array = [1, 3, 5, 2, 4, 6, 8, 7];
console.log(findSequences(array));
// 输出: [[1, 3, 5], [5, 2], [2, 4, 6], [8, 7]]