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contents: fix typo in array cheatsheet (#299)

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@ -104,7 +104,7 @@ Can you sort the array? Sometimes sorting the array first may significantly simp
For questions where summation or multiplication of a subarray is involved, pre-computation using hashing or a prefix/suffix sum/product might be useful. Examples: [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/), [Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/), [LeetCode questions tagged "prefix-sum"](https://leetcode.com/tag/prefix-sum/) For questions where summation or multiplication of a subarray is involved, pre-computation using hashing or a prefix/suffix sum/product might be useful. Examples: [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/), [Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/), [LeetCode questions tagged "prefix-sum"](https://leetcode.com/tag/prefix-sum/)
### Index has a hash key ### Index as a hash key
If you are given a sequence and the interviewer asks for O(1) space, it might be possible to use the array itself as a hash table. For example, if the array only has values from 1 to N, where N is the length of the array, negate the value at that index (minus one) to indicate presence of that number. Examples: [First Missing Positive](https://leetcode.com/problems/first-missing-positive/), [Daily Temperatures](https://leetcode.com/problems/daily-temperatures/) If you are given a sequence and the interviewer asks for O(1) space, it might be possible to use the array itself as a hash table. For example, if the array only has values from 1 to N, where N is the length of the array, negate the value at that index (minus one) to indicate presence of that number. Examples: [First Missing Positive](https://leetcode.com/problems/first-missing-positive/), [Daily Temperatures](https://leetcode.com/problems/daily-temperatures/)

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