题解 | #顺时针打印矩阵#

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 * 
 * @param matrix int整型二维数组 
 * @return int整型一维数组
 */
export function printMatrix(matrix: number[][]): number[] {
    // write code here
    //边界模拟法
    const res = []
    if(matrix.length === 0)return res
    //定义四个边界
    let left = 0
    let right = matrix[0].length - 1
    let up = 0
    let down = matrix.length - 1
    while(left <= right&&up <= down){
        //上边界的从左向右打印
        for(let i = left;i <= right;i++){
            res.push(matrix[up][i])
        }
        up++
        //上边界到下边界
        if(up > down){
            break
        }
        for(let i = up;i <= down;i++){
            res.push(matrix[i][right])
        }
        //下边界向上
        right--
        if(left > right){
            break
        }
        
        //下边界从右到做
        for(let i = right;i >= left;i--){
            res.push(matrix[down][i])
        }
        down--
        if(up > down){
            break
        }
        for(let i = down;i >= up;i--){
            res.push(matrix[i][left])
        }
        left++
        if(left > right){
            break;
        }
    }
    return res   
}