【LeetCode】Spiral Matrix II

Given an integer n, generate a square matrix filled with
elements from 1 to n2 in spiral order.

For example,
Given n = 3,

You should return the following matrix:

[

 [ 1, 2, 3 ],

 [ 8, 9, 4 ],

 [ 7, 6, 5 ]

]
此题与Spiral Matrix类似，可以用相同的方法解决，相比之下，此题比前一题简单

public class Solution {

    public int[][] generateMatrix(int n) {

        int[][] matrix=new int[n][n];

        int temprow=n;

        int tempcol=n;

        int start =-1;

        int end=-1;

        int t=1;

        while(temprow>0&&tempcol>0){

            start++;

            end++;

            for(int i=start;i<tempcol;i++){

                matrix[start][i]=t;

                t++;

            }

for(int j=start+1;j<temprow;j++){

                matrix[j][tempcol-1]=t;

                t++;

            }

            for(int x=tempcol-2;x>=end;x--){

                matrix[temprow-1][x]=t;

                t++;

            }
for(int y=temprow-2;y>start;y--){

                matrix[y][end]=t;

                t++;

            }
temprow=temprow-1;

            tempcol=tempcol-1;

        }

        return matrix;
}

}

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