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  • 54. Spiral Matrix

    Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.

    For example,
    Given the following matrix:

    [
     [ 1, 2, 3 ],
     [ 4, 5, 6 ],
     [ 7, 8, 9 ]
    ]
    

    You should return [1,2,3,6,9,8,7,4,5].

    直接travel

    public class Solution {
        public List<Integer> spiralOrder(int[][] matrix) {
            ArrayList<Integer> array = new ArrayList<>();
            if(matrix.length == 0) return array;
            int rowtop = 0;
            int rowbottom = matrix.length-1;
            int colleft = 0;
            int colright = matrix[0].length-1;
            while(rowtop <= rowbottom && colleft <= colright){
                //travel from left to right
                for(int i = colleft ; i <= colright ; i++){
                    array.add(matrix[rowtop][i]);
                }
                rowtop++;
                
                // travel from top to bottom
                for(int i = rowtop ; i <= rowbottom ; i++){
                    array.add(matrix[i][colright]);
                }
                colright--;
                
                //travel from right to left
                if(rowbottom >= rowtop)
                    for(int i = colright ; i >= colleft ; i--){
                        array.add(matrix[rowbottom][i]);
                    }
                rowbottom--;
                
                // travel from bottom to top
                if(colleft <= colright)
                    for(int i = rowbottom ; i >= rowtop ; i--){
                        array.add(matrix[i][colleft]);
                    }
                colleft++;
                
            }
            return array;
        }
    }
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  • 原文地址:https://www.cnblogs.com/joannacode/p/6106403.html
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