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BIG-Bench Extra Hard (BBEH) / You are an expert in a language called dyck where you must complete the language…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

input

You are an expert in a language called dyck where you must complete the language sequence of unclosed brackets of all types (e.g., [], {}, <>). You are given an initial initial dyck language sequence and the steps, provided as
thoughts, that were used to arrive at the closing bracket sequence in the dyck language. Your job is to identify the first step that was a mistake in reasoning about the closing bracket sequence in dyck language, if any.
This can be forgetting to close a bracket or closing with the wrong bracket or incorrectly copying the prior subsequence of closing brackets to the next step.
Task: Complete the rest of the sequence, making sure that the parentheses are closed properly. Input: [ ( { [ < < > > [ < < { } > > ] ]
Thought 1: We should process each input one by one and keep track of the stack configuration.
Thought 2: stack: empty
Thought 3: [ ; stack: [
Thought 4: ( ; stack: [ (
Thought 5: { ; stack: [ ( {
Thought 6: [ ; stack: [ ( { [
Thought 7: < ; stack: [ ( { [ <
Thought 8: < ; stack: [ ( { [ < <
Thought 9: > ; stack: [ ( { [ <
Thought 10: > ; stack: [ ( { [
Thought 11: [ ; stack: [ ( { [ [
Thought 12: < ; stack: [ ( { [ [ <
Thought 13: < ; stack: [ ( { [ [ < <
Thought 14: { ; stack: [ ( { [ [ < < {
Thought 15: } ; stack: [ ( { [ [ < <
Thought 16: > ; stack: [ ( { [ [ <
Thought 17: > ; stack: [ ( { [ [
Thought 18: ] ; stack: [ ( { [
Thought 19: ] ; stack: [ ( {
Thought 20: Now, we have reached the end. The final stack is "[ ( {".
Thought 21: We will need to pop out "{", "(", "[" one by one in that order.
Thought 22: So, we need "}", ")", "]". So the answer is } ) ]
Q: Is there a mistake in this sequence? Write "No" if there are no mistakes, or the number N if there is a mistake in Thought N.

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Source and history

task_id
f4688e71-f83f-5ccb-991b-ded219a245f5
task_key
bbeh~5fdyck~5flanguages--full--f4688e71-f83f-5ccb-991b-ded219a245f5
task_revision_id
1
config / split
bbeh_dyck_languages / full

Official source

initial import