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  1. #define logd(x) printf(#x": %d\n", x)
  2. #define N(x) !(x%2)
  3. a,b,c,d,e,i,j,x,y,**z;
  4. p(){for(j=y;j--;)for(i=x;i--;printf("%*d%c",(int)log10(x*y)+1,z[x-i-1][y-j-1],i?32:10));}
  5. f(){
  6.     if(c>0&&!d&&x-i-1==j){
  7.         c=0;
  8.         d=1;
  9.     }
  10.     else if(!c&&d>0&&x-i-1-y%2==y-j-1){
  11.         c=-1;
  12.         d=0;
  13.     }
  14.     else if(c<0&&!d&&i+!(y%2)-(x<y?!(x%2):0)==y-j-1){
  15.         c=0;
  16.         d=-1;
  17.     }
  18.     else if(!c&&d<0&&i-(x<y?!(x%2):0)==j){
  19.         c=1;
  20.         d=0;
  21.     }
  22.     i+=c;
  23.     j+=d;
  24. }
  25. main(){
  26.     scanf("%d%d",&x,&y);
  27.     z=malloc(x*4);
  28.     for(i=x;i--;z[i]=malloc(y*4));
  29.  
  30.     a=x/2-(x<y?0:N(x));
  31.     b=y/2-(x<y?0:N(y));
  32.     a=a<b?a:b;
  33.     b=(a<b?a:b)-(x<y?N(x):0);
  34.     c=!(x<y);
  35.     d=x<y;
  36.  
  37.     i=a;
  38.     j=b;
  39.  
  40.     for(i=a,j=b;e++<x*y;z[i][j]=e,f());
  41.  
  42.     p();
  43. }
Success #stdin #stdout 0s 1924KB
comments (?)
stdin
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4 9
stdout
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 0 17 18 19
 0 16  1 20
 0 15  2 21
 0 14  3 22
36 13  4 23
35 12  5 24
34 11  6 25
33 10  7 26
32  9  8 27
https://ideone.com/sUy5oB
language:
C (gcc 8.3)
created:
13 years ago
visibility:
secret

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