# Why the accepted programs can't get correct answer for two cases?

• when considering the problem, I write several cases to test before submit. After some trying, finally I gave up, and decided to see other peoples' idea. Then I see some claimed AC program, yes, they did got AC on leetcode, and I understand the algorithm behind them. But could you guys tell why the following cases won't pass.

``````{120,121,119,117,116,115}, // expect 118
{8,7,5,4,9,12,11,10}       // expect 6
``````

the problem itself just stated `unsorted integer array`, and I think the two cases I list above is valid?

The program I tested including these:

"my c solution 4ms"

"my short c solution o(1) space and o(n) time"

• What do those programs return for those cases? And why do you expect 118 and 6 for them? The correct answer for both is 1.

• why should we expected 1 instead of 118 and 6? The problem does not say that the the values should come from `1,2,3,..,n`. Ok, I see you point. My misunderstanding originate from how I understand 'miss', I take it as first positive integer missed in a consecutive serie.

• Your understanding is not bad, while it maybe not the expectation of this question.

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