Snapchat - 向左下角打印2D矩阵


https://warmland.gitbooks.io/algorithm/content/interview/snapchat_-_xiang_zuo_xia_jiao_da_yin_2d_ju_zhen.html
题目是这样的,给一个2d矩阵,向左下角打印矩阵,比如
1,2,3,4

5,6,7,8

9,10,11,12
结果是{{1},{2,5},{3,6,9},{4,7,10},{8,11},{12}}



+

所以解题的重点是,结果里面的每一组,它们的横坐标+纵坐标是相等的,然后最大的可能是col+row-2
public List<List<Integer>> printMatrix(int[][] board) {
    int height = board.length;
    int width = board[0].length;
    List<List<Integer>> res = new ArrayList<>();
    if (width == 0 || height == 0) {
        return res;
    }
    int diagonal = width + height - 2;
    for (int sum = 0; sum <= diagonal; sum++) {
        List<Integer> cur = new ArrayList<>();
        for (int y = 0; y <= sum; y++) {
            int x = sum - y;
            if (y < height && x < width) {
                //cur.add(y * width + x + 1);
                cur.add(board[y][x]);
            }
        }
        res.add(cur);
    }
    return res;
}


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