原文：
给定 2d 数组，以反向螺旋形式打印。 我们已经讨论过。 本文讨论了如何进行反向打印。 请参阅以下示例。
input:
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
output:
10 11 7 6 5 9 13 14 15 16 12 8 4 3 2 1
input:
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
output:
11 10 9 8 7 13 14 15 16 17 18 12 6 5 4 3 2 1
c
// this is a modified code of
// https://www.geeksforgeeks.org/print-a-given-matrix-in-spiral-form/
#include
#define r 3
#define c 6
using namespace std;
// function that print matrix in reverse spiral form.
void reversespiralprint(int m, int n, int a[r][c])
{
// large array to initialize it
// with elements of matrix
long int b[100];
/* k - starting row index
l - starting column index*/
int i, k = 0, l = 0;
// counter for single dimension array
//in which elements will be stored
int z = 0;
// total elements in matrix
int size = m*n;
while (k < m && l < n)
{
// variable to store value of matrix.
int val;
/* print the first row from the remaining rows */
for (i = l; i < n; i)
{
// printf("%d ", a[k][i]);
val = a[k][i];
b[z] = val;
z;
}
k ;
/* print the last column from the remaining columns */
for (i = k; i < m; i)
{
// printf("%d ", a[i][n-1]);
val = a[i][n-1];
b[z] = val;
z;
}
n--;
/* print the last row from the remaining rows */
if ( k < m)
{
for (i = n-1; i >= l; --i)
{
// printf("%d ", a[m-1][i]);
val = a[m-1][i];
b[z] = val;
z;
}
m--;
}
/* print the first column from the remaining columns */
if (l < n)
{
for (i = m-1; i >= k; --i)
{
// printf("%d ", a[i][l]);
val = a[i][l];
b[z] = val;
z;
}
l ;
}
}
for (int i=size-1 ; i>=0 ; --i)
{
cout<
java
// java code for print a given matrix in
// reverse spiral form
class gfg {
public static int r = 3, c = 6;
// function that print matrix in reverse spiral form.
public static void reversespiralprint(int m, int n,
int a[][])
{
// large array to initialize it
// with elements of matrix
long b[] = new long[100];
/* k - starting row index
l - starting column index*/
int i, k = 0, l = 0;
// counter for single dimension array
//in which elements will be stored
int z = 0;
// total elements in matrix
int size = m * n;
while (k < m && l < n)
{
// variable to store value of matrix.
int val;
/* print the first row from the remaining
rows */
for (i = l; i < n; i)
{
val = a[k][i];
b[z] = val;
z;
}
k ;
/* print the last column from the remaining
columns */
for (i = k; i < m; i)
{
val = a[i][n-1];
b[z] = val;
z;
}
n--;
/* print the last row from the remaining
rows */
if ( k < m)
{
for (i = n-1; i >= l; --i)
{
val = a[m-1][i];
b[z] = val;
z;
}
m--;
}
/* print the first column from the remaining
columns */
if (l < n)
{
for (i = m-1; i >= k; --i)
{
val = a[i][l];
b[z] = val;
z;
}
l ;
}
}
for (int x = size-1 ; x>=0 ; --x)
{
system.out.print(b[x] " ");
}
}
/* driver program to test above function */
public static void main(string[] args)
{
int a[][] = { {1, 2, 3, 4, 5, 6},
{7, 8, 9, 10, 11, 12},
{13, 14, 15, 16, 17, 18}};
reversespiralprint(r, c, a);
}
}
// this code is contributed by arnav kr. mandal.
python3
# python3 code to print a given
# matrix in reverse spiral form
# this is a modified code of
# https:#www.geeksforgeeks.org/print-a-given-matrix-in-spiral-form/
r, c = 3, 6
def reversespiralprint(m, n, a):
# large array to initialize it
# with elements of matrix
b = [0 for i in range(100)]
#/* k - starting row index
#l - starting column index*/
i, k, l = 0, 0, 0
# counter for single dimension array
# in which elements will be stored
z = 0
# total elements in matrix
size = m * n
while (k < m and l < n):
# variable to store value of matrix.
val = 0
# print the first row
# from the remaining rows
for i in range(l, n):
# printf("%d ", a[k][i])
val = a[k][i]
b[z] = val
z = 1
k = 1
# print the last column
# from the remaining columns
for i in range(k, m):
# printf("%d ", a[i][n-1])
val = a[i][n - 1]
b[z] = val
z = 1
n -= 1
# print the last row
# from the remaining rows
if (k < m):
for i in range(n - 1, l - 1, -1):
# printf("%d ", a[m-1][i])
val = a[m - 1][i]
b[z] = val
z = 1
m -= 1
# print the first column
# from the remaining columns
if (l < n):
for i in range(m - 1, k - 1, -1):
# printf("%d ", a[i][l])
val = a[i][l]
b[z] = val
z = 1
l = 1
for i in range(size - 1, -1, -1):
print(b[i], end = " ")
# driver code
a = [[1, 2, 3, 4, 5, 6],
[7, 8, 9, 10, 11, 12],
[13, 14, 15, 16, 17, 18]]
reversespiralprint(r, c, a)
# this code is contributed by mohit kumar
c#
// c# code for print a given matrix in
// reverse spiral form
using system;
class gfg {
public static int r = 3, c = 6;
// function that print matrix in reverse spiral form.
public static void reversespiralprint(int m, int n,
int [,]a)
{
// large array to initialize it
// with elements of matrix
long []b = new long[100];
/* k - starting row index
l - starting column index*/
int i, k = 0, l = 0;
// counter for single dimension array
//in which elements will be stored
int z = 0;
// total elements in matrix
int size = m * n;
while (k < m && l < n)
{
// variable to store value of matrix.
int val;
/* print the first row from the remaining
rows */
for (i = l; i < n; i)
{
val = a[k,i];
b[z] = val;
z;
}
k ;
/* print the last column from the remaining
columns */
for (i = k; i < m; i)
{
val = a[i,n-1];
b[z] = val;
z;
}
n--;
/* print the last row from the remaining
rows */
if ( k < m)
{
for (i = n-1; i >= l; --i)
{
val = a[m-1,i];
b[z] = val;
z;
}
m--;
}
/* print the first column from the remaining
columns */
if (l < n)
{
for (i = m-1; i >= k; --i)
{
val = a[i,l];
b[z] = val;
z;
}
l ;
}
}
for (int x = size-1 ; x>=0 ; --x)
{
console.write(b[x] " ");
}
}
/* driver program to test above function */
public static void main()
{
int [ ,]a = { {1, 2, 3, 4, 5, 6},
{7, 8, 9, 10, 11, 12},
{13, 14, 15, 16, 17, 18}};
reversespiralprint(r, c, a);
}
}
// this code is contributed by vt_m.
php
= $l; --$i)
{
// printf("%d ", a[m-1][i]);
$val = $a[$m-1][$i];
$b[$z] = $val;
$z;
}
$m--;
}
// print the first column
// from the remaining columns
if ($l < $n)
{
for ($i = $m - 1; $i >= $k; --$i)
{
$val = $a[$i][$l];
$b[$z] = $val;
$z;
}
$l ;
}
}
for ($i = $size - 1; $i >= 0; --$i)
{
echo $b[$i]." ";
}
}
// driver code
$a= array(array(1, 2, 3, 4, 5, 6),
array(7, 8, 9, 10, 11, 12),
array(13, 14, 15, 16, 17, 18));
reversespiralprint($r, $c, $a);
// this code is contributed by mits
?>
输出：
11 10 9 8 7 13 14 15 16 17 18 12 6 5 4 3 2 1
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