절대값 MAX 매크로

/*

4 3 3

1 1

3 3

4 1

*/

#include <stdio.h>

#define ABS(t) ((t)<0?-(t):(t))

#define MAX(a,b) ((a)>(b)?(a):(b))

int W, H, N;//가로, 세로크기, 데이타개수

int x[1010], y[1010];

int min;

int main(void)

{

int i;

//freopen("input.txt", "r", stdin);

scanf("%d %d %d", &W, &H, &N);

for (i = 0; i < N; i++) {

scanf("%d %d", &x[i], &y[i]);

}

int cnt = 0, sx, sy, xdis, ydis;

sx = x[0], sy = y[0];

for (i = 1; i < N; i++) {

xdis = sx - x[i];

ydis = sy - y[i];

if (xdis * ydis >= 0) cnt += MAX(ABS(xdis), ABS(ydis));

else cnt += ABS(xdis) + ABS(ydis);

sx = x[i], sy = y[i];

}

printf("%d", cnt);

return 0;

}//