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  • 转圈打印矩阵

    Problem:
      【题目】 给定一个整型矩阵matrix,请按照转圈的方式打印它。
      例如: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 打印结果为:1,2,3,4,8,12,16,15,14,13,9,5,6,7,11, 10
      【要求】 额外空间复杂度为O(1)。

    Solution:
      采用一圈一圈打印的方式,即确定左上角与右下角,然后从外向内打印一圈,打印完了之后,
      左上角向右下一一个,右下角向上上移一个,继续打印
      左上角的行>右下角的行或者左上角的列 > 右下角的列, 则打印完毕

    Code:

      

     1 #include <iostream>
     2 #include <queue>
     3 
     4 using namespace std;
     5 
     6 
     7 template<class T>
     8 void RotatePrint(T arr, const int x, const int y)
     9 {
    10     int lx = 0, ly = 0; //左上角坐标
    11     int rx = x - 1, ry = y - 1;//右下角的坐标
    12 
    13     while (lx <= rx || ly <= ry)
    14     {
    15         if (lx == rx)
    16         {
    17             for (int i = ly; i <= ry; ++i)//打印一行的矩阵
    18                 cout << arr[lx][i] << "  ";
    19         }
    20         else if (ly == ry)
    21         {
    22             for (int i = lx; i <= rx; ++i)//打印一列的矩阵
    23                 cout << arr[i][ly] << "  ";
    24         }
    25         else 
    26         {  //打印不是单行或单列的矩阵
    27 
    28             for (int i = ly; i < ry; ++i)//打印上行
    29                 cout << arr[lx][i] << "  ";
    30             for (int i = lx; i < rx; ++i)//打印右列
    31                 cout << arr[i][ry] << "  ";
    32             for (int i = ry; i > ly; --i)//打印下行
    33                 cout << arr[rx][i] << "  ";
    34             for (int i = rx; i > lx; --i)//打印左列
    35                 cout << arr[i][ly] << "  ";
    36         }
    37 
    38         lx += 1;//左上角右下移
    39         ly += 1;
    40         rx -= 1;//右下角左上移
    41         ry -= 1;
    42     }
    43     cout << endl << "******************************" << endl;
    44 
    45 }
    46 
    47 
    48 void Test()
    49 {
    50     int aa[3][3] = { 1,2,3, 4,5,6, 7,8,9 };
    51     int bb[3][4] = { 1,2,3,4,5,6,7,8,9,10,11,12 };
    52 
    53     RotatePrint(aa, 3, 3);
    54     RotatePrint(bb, 3, 4);
    55 
    56 }
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  • 原文地址:https://www.cnblogs.com/zzw1024/p/10988648.html
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