&emspinclude "iostream"

using namespace std;

&emspdefine RIGHT 1

&emspdefine DOWN 2

&emspdefine LEFT 3

&emspdefine UP 4

int judge(int step, int walk, int flag)

{

if( walk< step )return flag;

switch(flag)

{

case RIGHT:

return DOWN;

case DOWN:

return LEFT;

case LEFT:

return UP;

case UP:

return RIGHT;

}

}

void matrix(int N)

{

int length = N * N;

int *p = new int[length];

int flag = RIGHT;

int step = N;

int count = 0;

int walk = -1;

for(int i = 0 ; i< length ; i )

{

walk = 1;

int n

ewflag = judge(step , walk , flag);

if(flag != newflag)

{

count = 1;

flag = newflag;

walk = 0;

if( (count 1) % 2 == 0 )

{

step -= 1;

}

}

switch(flag)

{

right

case RIGHT:

if(i == 0)

p[i] = 0;

else

p[i] = p[i - 1] 1;

break;

down

case DOWN:

p[i] = p[i - 1] N;

break;

left

case LEFT:

p[i] = p[i - 1] - 1;

break;

up

case UP:

p[i] = p[i - 1] -N;

}

}

int *tmp = new int[length];

for(int j = 0; j< length; j )

{

tmp[p[j]] = j 1;

}

for(j = 0; j< length; j )

{

cout