Please add test case 'baaaaaaaa...aaaa', ['a', 'aa', 'aaa', ..., 'aaa...aa']


  • 24
    C

    The topic has been well discussed in many posts such as here and here. Because the existence of test case 'aaaaa...aaaab', ['a', 'aa', 'aaa', ... 'aaa...aa'], the forward DP solution will cause MLE while the backward DP is just fine, apparently the test case 'baaaaaaaa...aaaa', ['a', 'aa', 'aaa', ..., 'aaa...aa'] should also be included.


  • 0
    S

    Hi, my understanding about this problem is that once we know dp[i], representing whether s[0...i] is re-constructable, we will stop at the first step for both case baaaaaaaa...aaaa and aaaaa...aaaab, since dp[s.length()] = false.

    If we add 'b' into the dictionary, it is the same case as 'aaaaa...aaaa', ['a', 'aa', 'aaa', ... 'aaa...aa']

    Back-tracing from the tail benefits because it is ensured that every path we generated is a valid path as long as your dp[] =true/false array is correct.


  • 1

    Thanks so much for pointing this out. I have added the test case so both mentioned solutions get Time Limit Exceeded now. Thanks!


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