[완료]스도쿠 솔루션 개발중에 질문있습니다

#include <stdio.h>
 
#define		N	9
 
void column(short* ptr);
void row(short* ptr);
 
int main(int argc, char** argv) {
	short data[N][N];
 
	for (int i=0; i<N*N; ++i) {
		data[i/N][i%N] = i+1;
	}
 
	printf("first row\n");
	row(data[0]);
	printf("second row\n");
	row(data[1]);
	printf("third row\n");
	row(data[2]);
 
	printf("first column\n");
	column(data[0]);
	printf("second column\n");
	column(&data[0][1]);
	printf("third column\n");
	column(&data[0][2]);
 
	return 0;
}
 
void column(short* ptr) {
	for (int i=0; i<N; ++i) {
		printf("%4d\n", *(ptr+i*N));
	}
}
 
void row(short* ptr) {
	for (int i=0; i<N; ++i) {
		printf("%4d", *(ptr+i));
	}
	printf("\n");
}

first row
   1   2   3   4   5   6   7   8   9
second row
  10  11  12  13  14  15  16  17  18
third row
  19  20  21  22  23  24  25  26  27
first column
   1
  10
  19
  28
  37
  46
  55
  64
  73
second column
   2
  11
  20
  29
  38
  47
  56
  65
  74
third column
   3
  12
  21
  30
  39
  48
  57
  66
  75