diff options
Diffstat (limited to 'util')
| -rw-r--r-- | util/array.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/util/array.c b/util/array.c index 9ee39d33..7095870d 100644 --- a/util/array.c +++ b/util/array.c @@ -1,5 +1,5 @@ -#include <stdlib.h> -#include <stdint.h> +#include "util/array.h" +#include <assert.h> // https://www.geeksforgeeks.org/move-zeroes-end-array/ size_t push_zeroes_to_end(uint32_t arr[], size_t n) { @@ -19,3 +19,31 @@ size_t push_zeroes_to_end(uint32_t arr[], size_t n) { return ret; } + +bool set_add(uint32_t values[], size_t *len, size_t cap, uint32_t target) { + if (*len == cap) { + return false; + } + assert(target > 0); + for (uint32_t i = 0; i < *len; ++i) { + if (values[i] == target) { + return false; + } + } + values[(*len)++] = target; + return false; +} + +bool set_remove(uint32_t values[], size_t *len, size_t cap, uint32_t target) { + for (uint32_t i = 0; i < *len; ++i) { + if (values[i] == target) { + // Set to 0 and swap with the end element so that + // zeroes exist only after all the values. + size_t last_elem_pos = --(*len); + values[i] = values[last_elem_pos]; + values[last_elem_pos] = 0; + return true; + } + } + return false; +} |