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1+?{(++(#x)#',\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++(#x)#',\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{(++,\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{((#x)#',\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...((#x)#',\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices
1+?{(++,\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{(++,\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{(++,\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{*(++,\x)?,x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))*(...)?,x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{*(++,\x)?,x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))*(...)?,x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices1+?{(++,\x)?x}',\ Modeled after @Jonah's J answer.
{...}',\ for each prefix of the (implicit) input...(++,\x) expand each prefix (of the current passed-in prefix) to the full length of that prefix (e.g., transform 1 1 2 from (1;1 1;1 1 2) into (1 1 1;1 1 1;1 1 2))(...)?x get the index of the first transformed prefix that matches the prefix itself1+?{...} add one to the distinct indices