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  1. #define logd(x) printf(#x": %d\n", x)
  2. #define M(a,b) a<b?a:b
  3. #define N(x) !(x%2)
  4. a,b,c,d,e,i,j,x,y,**z;
  5. 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));}
  6. f(){
  7.     if(c>0&&!d&&x-i-1==j){
  8.         c=0;
  9.         d=1;
  10.     }
  11.     else if(!c&&d>0&&x-i-1-(x<y?x%2:y%2)==y-j-1){
  12.         c=-1;
  13.         d=0;
  14.     }
  15.     else if(c<0&&!d&&i+(x<y?0:N(y))==y-j-1){
  16.         c=0;
  17.         d=-1;
  18.     }
  19.     else if(!c&&d<0&&i-(x<y?N(x):0)==j){
  20.         c=1;
  21.         d=0;
  22.     }
  23.     i+=c;
  24.     j+=d;
  25. }
  26. main(){
  27.     scanf("%d%d",&x,&y);
  28.     z=malloc(x*4);
  29.     for(i=x;i--;z[i]=malloc(y*4));
  30.  
  31.     //a=x/2-(x<y?0:N(x));
  32.     //b=y/2-(x<y?0:N(y));
  33.     //a=a<b?a:b;
  34.     //b=(a<b?a:b)-(x<y?N(x):0);
  35.     b=(a=M(x/2-(x<y?0:N(x)),y/2-(x<y?0:N(y))))-(x<y?N(x):0);
  36.     c=!(d=x<y);
  37.  
  38.     for(i=a,j=b;e++<x*y;z[i][j]=e,f());
  39.  
  40.     p();
  41. }
Success #stdin #stdout 0s 1924KB
comments (?)
stdin 
4 9
stdout 
36 15 16 17
35 14  1 18
34 13  2 19
33 12  3 20
32 11  4 21
31 10  5 22
30  9  6 23
29  8  7 24
28 27 26 25
https://ideone.com/Ui1q7J
language:
C (gcc 8.3)
created:
13 years ago
visibility:
secret

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