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螺旋矩阵-ii(数组)
阅读量:366 次
发布时间:2019-03-04

本文共 939 字,大约阅读时间需要 3 分钟。

题目描述

给定一个整数n,将数字1到n^2n

2
按螺旋的顺序填入n×n的矩阵
例如:
给出的n=3,
你应该返回如下矩阵:
[
[ 1, 2, 3 ],
[ 8, 9, 4 ],
[ 7, 6, 5 ]
]

class Solution {   public:    /**     *      * @param n int整型      * @return int整型vector
<>> */ vector
> generateMatrix(int n) { // write code here vector
> matrix(n, vector
(n)); int left = 0; int right = n-1; int up = 0; int down = n-1; int index = 1; while(left <= right && up <= down){ for(int i = left; i <= right && up <= down; i++){ matrix[up][i] = index; index++; } for(int i = up+1; i <= down && left<= right; i++){ matrix[i][right] = index++; } for(int i = right-1; i >= left && up <= down; i--){ matrix[down][i] = index++; } for(int i = down-1; i >= up+1 && left <= right; i--){ matrix[i][left] = index++; } left++; right--; up++; down--; } return matrix; }};

在这里插入图片描述

错因分析

  • 我前面都是创建的(n+1)*(n+1)维的数组,导致答案一直出错

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