You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
2.5 KiB
112 lines
2.5 KiB
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
void *read_file_contents(const char *fname, size_t *len)
|
|
{
|
|
FILE *f = fopen(fname, "r");
|
|
if (!f) {
|
|
perror(fname);
|
|
return NULL;
|
|
}
|
|
fseek(f, 0, SEEK_END);
|
|
*len = ftell(f);
|
|
rewind(f);
|
|
void *contents = malloc(*len);
|
|
if (!contents) {
|
|
perror("malloc");
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
fread(contents, *len, 1, f);
|
|
fclose(f);
|
|
return contents;
|
|
}
|
|
|
|
void remove_dupes(char *mem, size_t len)
|
|
{
|
|
int found;
|
|
char last_char;
|
|
size_t last_char_pos;
|
|
|
|
do {
|
|
found = 0;
|
|
last_char = '\0';
|
|
last_char_pos = 0;
|
|
|
|
for (size_t i = 0; i < len; i++) {
|
|
if (!mem[i]) continue;
|
|
|
|
if (tolower(mem[i]) == tolower(last_char) &&
|
|
mem[i] != last_char) {
|
|
mem[i] = mem[last_char_pos] = '\0';
|
|
found = 1;
|
|
last_char_pos = 0;
|
|
last_char = '\0';
|
|
} else {
|
|
last_char_pos = i;
|
|
last_char = mem[last_char_pos];
|
|
}
|
|
}
|
|
} while (found);
|
|
}
|
|
|
|
void remove_char(char *mem, size_t len, char c)
|
|
{
|
|
for (char *i = mem; i < mem + len; i++) {
|
|
if (tolower(*i) == c) *i = '\0';
|
|
}
|
|
}
|
|
|
|
size_t strip_zeroes(char *mem, size_t len)
|
|
{
|
|
size_t new_len = len;
|
|
|
|
char *current = mem + len - 1;
|
|
while (len) {
|
|
while (len && *current) {len--; current--;}
|
|
if (!len) break;
|
|
|
|
char *start = current;
|
|
while (len && !*current) {len--; current--;}
|
|
size_t diff = new_len - len - (start - current);
|
|
memmove(current + 1, start + 1, diff);
|
|
new_len = len + diff;
|
|
}
|
|
|
|
return new_len;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
size_t string_len;
|
|
char *string = read_file_contents("input", &string_len);
|
|
if (!string) return 1;
|
|
|
|
while (isspace(string[string_len - 1])) string[--string_len] = '\0';
|
|
|
|
char *string_copy = malloc(string_len);
|
|
if (!string_copy) {
|
|
perror("malloc");
|
|
free(string);
|
|
return 1;
|
|
}
|
|
size_t shortest = string_len;
|
|
|
|
for (char x = 'a'; x <= 'z'; x++) {
|
|
printf("Attempting '%c'... ", x);
|
|
memcpy(string_copy, string, string_len);
|
|
remove_char(string_copy, string_len, x);
|
|
remove_dupes(string_copy, string_len);
|
|
size_t len = strip_zeroes(string_copy, string_len);
|
|
printf("%lu\n", len);
|
|
if (shortest > len) shortest = len;
|
|
}
|
|
|
|
printf("Shortest: %lu\n", shortest);
|
|
|
|
free(string_copy);
|
|
free(string);
|
|
return 0;
|
|
}
|
|
|