Q490: Rotating Sentences

/*
 輸入最後一行需加上 Ctrl + Z
 Run time: 0.000
*/
#include <stdio.h>
#include <string.h>
#define N 100
char arr[N+1][N+1];
int len[N+1];
int main()
{
  int i, j;
  int max = 0;
  int level;
  for ( i = 0; ; i++)
      if (gets(arr[i]) == NULL)
          break;
      else
      {
          len[i] = strlen(arr[i]);
          if (max < len[i])
              max = len[i];
      }

  level = i;

  for (i = 0; i < max; i++)
  {
      for ( j = level-1; j >= 0; j--)
      {
          if (arr[j][i] != '\0')
              printf("%c", arr[j][i]);
          else
              printf(" ");
      }
      printf("\n");
  }

  return 0;
}