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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <inttypes.h>
  4.  
  5.  
  6. //////////////////////////////////////
  7.  
  8. typedef struct {
  9.  
  10.   int group[8];
  11.   uint64_t points;
  12.  
  13. } BestGroup;
  14.  
  15. //////////////////////////////////////
  16.  
  17. typedef struct {
  18.   BestGroup *array;
  19.   size_t used;
  20.   size_t size;
  21. } Array;
  22.  
  23. void initArray(Array *a, size_t initialSize) {
  24.   a->array = (BestGroup *)malloc(initialSize * sizeof(BestGroup));
  25.   a->used = 0;
  26.   a->size = initialSize;
  27. }
  28.  
  29. void insertArray(Array *a, int *group_add, uint64_t points_add) {
  30.   // a->used is the number of used entries, because a->array[a->used++] updates a->used only *after* the array has been accessed.
  31.   // Therefore a->used can go up to a->size 
  32.   if (a->used == a->size) {
  33.     a->size *= 2;
  34.     a->array = (BestGroup *)realloc(a->array, a->size * sizeof(BestGroup));
  35.   }
  36.  
  37.   int i;
  38.  
  39.   for (i = 0; i < 8; i++)
  40.   {
  41.     a->array[a->used].group[i] = group_add[i];
  42.   }
  43.   a->array[a->used].points = points_add;
  44.   a->used++;
  45. }
  46.  
  47. void freeArray(Array *a) {
  48.   free(a->array);
  49.   a->array = NULL;
  50.   a->used = a->size = 0;
  51. }
  52.  
  53. ///////////////////////////////////////////////////////////////////////////////
  54.  
  55. int main()
  56.  
  57. {
  58.     Array a;
  59.     int i;
  60.     int list[8] = {0, 1, 2, 2, 4, 5, 6, 7};
  61.  
  62.     initArray(&a, 5);  // initially 5 elements
  63.     for (i = 0; i < 100; i++)
  64.       insertArray(&a, list, i);  // automatically resizes as necessary
  65.     printf("%d\n", a.array->group[1]);  // print 2nd element
  66.     printf("%lu\n", a.used);  // print number of elements
  67.     freeArray(&a);
  68. }
Success #stdin #stdout 0s 9424KB
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https://ideone.com/0WiXwO
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
public

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