c-gcc, 83 bytes

Result

WA

Duration

1071ms

Code [DL]

h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}

stdin

57
60

stdout

                                                           *                                                           
*******        ********        ********        ********    *
 * * *         * * * *         * * * *         * * * *     * 
*  **          **  **          **  **          **  **      *
   *           *   *           *   *           *   *       *   
***            ****            ****            ****        *
 *             * *             * *             * *         * 
*              **              **              **          *
               *               *               *           *               
***************                ****************            *
 * * * * * * *                 * * * * * * * *             * 
*  **  **  **                  **  **  **  **              *
   *   *   *                   *   *   *   *               *   
***    ****                    ****    ****                *
 *     * *                     * *     * *                 * 
*      **                      **      **                  *
       *                       *       *                   *       
*******                        ********                    *
 * * *                         * * * *                     * 
*  **                          **  **                      *
   *                           *   *                       *   
***                            ****                        *
 *                             * *                         * 
*                              **                          *
                               *                           *                               
*******************************                            *
 * * * * * * * * * * * * * * *                             * 
*  **  **  **  **  **  **  **                              *
   *   *   *   *   *   *   *                               *   
***    ****    ****    ****                                *
 *     * *     * *     * *                                 * 
*      **      **      **                                  *
       *       *       *                                   *       
*******        ********                                    *
 * * *         * * * *                                     * 
*  **          **  **                                      *
   *           *   *                                       *   
***            ****                                        *
 *             * *                                         * 
*              **                                          *
               *                                           *               
***************                                            *
 * * * * * * *                                             * 
*  **  **  **                                              *
   *   *   *                                               *   
***    ****                                                *
 *     * *                                                 * 
*      **                                                  *
       *                                                   *       
*******                                                    *
 * * *                                                     * 
*  **                                                      *
   *                                                       *   
***                                                        *
 *                                                         * 
*                                                          *
                                                           *                                                           

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
 ^
/tmp/code.c:1:1: warning: type defaults to 'int' in declaration of 'h' [-Wimplicit-int]
/tmp/code.c:1:3: warning: data definition has no type or storage class
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
   ^
/tmp/code.c:1:3: warning: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
/tmp/code.c:1:5: warning: return type defaults to 'int' [-Wimplicit-int]
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
     ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:5: warning: type of 'c' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:5: warning: type of 'w' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:19: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
                   ^~~~~
/tmp/code.c:1:19: warning: incompatible implicit declaration of built-in function 'scanf'
/tmp/code.c:1:19: note: include '<stdio.h>' or provide a declaration of 'scanf'
+#include <stdio.h>
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
                   ^~~~~
/tmp/code.c:1:41: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
 h;i;main(c,w){for(scanf("%d%d",&h,&w);h;putchar(++i%w&-c?32:i>w?c=--h,i=0,10:42));}
                                         ^~~~~~~