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fix: improve prelex logic #97

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fix: improve prelex logic #97

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9d8e712
fix: improve prelex logic
logic-finder Jul 24, 2026
9132820
fix: use a new variable for clear intention
logic-finder Jul 26, 2026
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17 changes: 11 additions & 6 deletions hhss/c/prelex.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,26 +4,31 @@
extern array_t *prelex(array_t *db, int datcnt) {
array_t *ret;
line_t *curr, *last;
int lastpos, rv;
int lastpos, pickcnt, rv;

ret = array_create();
lastpos = array_size(db);
lastpos = array_size(db) - 1; /* last elem idx = len - 1 */

for (int k = 0; k < datcnt; k++) {
rv = rand_range(0, lastpos - 1); /* [0, lp - 1] */
pickcnt = datcnt - 1; /* -1 since the last pick won't swap */
/* pick & swap (datcnt - 1) times */
for (int k = 0; k < pickcnt; k++) {
rv = rand_range(0, lastpos); /* [0, lp] */

curr = array_get(db, rv);
last = array_get(db, lastpos - 1);
last = array_get(db, lastpos);

// swap
array_set(db, lastpos - 1, curr);
array_set(db, lastpos, curr);
array_set(db, rv, last);

array_append(ret, curr->run, curr->len + 1);

// in order to prevent duplication
lastpos--;
}
rv = rand_range(0, lastpos); /* the last pick (no swap) */
curr = array_get(db, rv);
array_append(ret, curr->run, curr->len + 1);

return ret;
}
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