/
    Do not return anything, modify matrix in-place instead.
    */
    // 上下+对角线 用时：56ms
    functionrotate(matrix: number[][]): void {
    if (matrix) {
    // 1、先上下交换
    matrix.forEach((item, index) => {
    constindex2=matrix.length- (index+1);
    if (index!==index2&&index>index2) {
    consttemp=matrix[index2];
    matrix[index2] =matrix[index];
    matrix[index] =temp;
    }
    });
    // 2、再对角线交换
    matrix.forEach((item, index) => {
    item.forEach((item2, index2) => {
    if (index!==index2&&index>index2) {
    consttemp=matrix[index][index2];
    matrix[index][index2] =matrix[index2][index];
    matrix[index2][index] =temp;
    }
    });
    });
    }
    }
    // 粗暴地直接往右转
    // 2022年2月8日复习：
    /
    Do not return anything, modify matrix in-place instead.
    */
    // 上下对角颠倒法 用时：72ms
    functionrotate2(matrix: number[][]): void {
    // 将数组上下颠倒
    for (letindex=0; index constindex2=matrix.length-1-index;
    if (index>=index2) break;
    consttemp=matrix[index2];
    matrix[index2] =matrix[index];
    matrix[index] =temp;
    }
    // 将数组对角线对换
    for (letx=0; x for (lety=0; y if (x>=y) continue;
    constx2=matrix.length-1-x;
    consttemp=matrix[x][y];
    matrix[x][y] =matrix[y][x];
    matrix[y][x] =temp;
    }
    }
    }