18a.c

   1 #include <stdio.h>
   2 #include <stdbool.h>
   3 #include <stdlib.h>
   4 #include <ctype.h>
   5
   6 struct number {
   7         int depth;
   8         int number;
   9 };
  10
  11 int parse_number(struct number numbers[])
  12 {
  13         int ns = 0;
  14         int depth = 0;
  15         int c = getchar();
  16         while ((c = getchar()) != '\n') {
  17                 switch(c) {
  18                 case '[':
  19                         depth++;
  20                         break;
  21                 case ']':
  22                         depth--;
  23                         break;
  24                 case ',':
  25                         break;
  26                 default:
  27                         if (isdigit(c))
  28                                 numbers[ns++] = (struct number){.depth=depth, .number=c-'0'};
  29                         else
  30                                 printf("halp\n");
  31                         break;
  32                 }
  33         }
  34         return ns;
  35 }
  36
  37 void print_number(struct number n[], int ns)
  38 {
  39         int olddepth = 0;
  40         for (int i = 0; i<ns; i++) {
  41                 if (n[i].depth > olddepth)
  42                         printf("[");
  43                 else if (n[i].depth < olddepth)
  44                         printf("]");
  45                 printf("%d ", n[i].number);
  46                 olddepth = n[i].depth;
  47         }
  48 }
  49
  50 int main ()
  51 {
  52         struct number n[100];
  53         int ns = parse_number(n);
  54         print_number(n, ns);
  55 }