检查值是否在数组内

function linearSearch(arr, target) {
    for (let i = 0; i < arr.length; i++) {
        if (arr[i] === target) {
            return true;
        }
    }
    return false;
}

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

function binarySearch(arr, target) {
    let left = 0;
    let right = arr.length - 1;

    while (left <= right) {
        let mid = Math.floor((left + right) / 2);
        if (arr[mid] === target) {
            return true;
        } else if (arr[mid] < target) {
            left = mid + 1;
        } else {
            right = mid - 1;
        }
    }
    return false;
}

// 示例用法
const sortedArray = [1, 2, 3, 4, 5];
console.log(binarySearch(sortedArray, 3)); // 输出: true
console.log(binarySearch(sortedArray, 6)); // 输出: false

const unsortedArray = [5, 3, 1, 4, 2];
const sortedArray = unsortedArray.sort((a, b) => a - b);
console.log(binarySearch(sortedArray, 3)); // 输出: true