**Easy**\n\n[1656. Design an Ordered Stream](https://leetcode.com/problems/design-an-ordered-stream/discuss/978366/remember-least-missing-index) - Python/Java\n[1661. Average Time of Process per Machine](https://leetcode.com/problems/average-time-of-process-per-machine/discuss/978347/select-with-sum-on-inner-join-and-group-by) - SQL\n[1662. Check If Two String Arrays are Equivalent](https://leetcode.com/problems/check-if-two-string-arrays-are-equivalent/discuss/978335/Iterative-comparison-Linear-PythonJava) - Python/Java\n[1667. Fix Names in a Table](https://leetcode.com/problems/fix-names-in-a-table/discuss/978299/select-with-left-ucase-lcase-substring-concat-and-order-by) - SQL\n[1668. Maximum Repeating Substring](https://leetcode.com/problems/maximum-repeating-substring/discuss/978292/Search-every-starting-index-O(N-*-M)-Time-PythonJava) - Python/Java\n[1672. Richest Customer Wealth](https://leetcode.com/problems/richest-customer-wealth/discuss/978159/Iterate-over-each-customer-PythonJava) - Python/Java\n[1677. Product\'s Worth Over Invoices](https://leetcode.com/problems/products-worth-over-invoices/discuss/977289/select-with-sum-group-by-order-by) - SQL\n[1678. Goal Parser Interpretation](https://leetcode.com/problems/goal-parser-interpretation/discuss/977285/Brute-Force-O(n)-Time) - Python/Java\n[1683. Invalid Tweets](https://leetcode.com/problems/invalid-tweets/discuss/977268/select-query-with-length) - SQL\n[1684. Count the Number of Consistent Strings](https://leetcode.com/problems/count-the-number-of-consistent-strings/discuss/977255/Brute-Force-O(Sum-of-length-of-all-strings)-Python) - Python/Java\n[1688. Count of Matches in Tournament](https://leetcode.com/problems/count-of-matches-in-tournament/discuss/977242/Logic-and-Math-O(1)-or-O(log2(N))-Python-Java) - Python/Java \n[1693. Daily Leads and Partners](https://leetcode.com/problems/daily-leads-and-partners/discuss/978134/select-distinct-count-with-group-by) - SQL\n[1694. Reformat Phone Number](https://leetcode.com/problems/reformat-phone-number/discuss/983743/iterative-O(n)-JavaPython) - Python/Java\n\n\n**Medium**\n[153. Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/discuss/1000540/Binary-Search-O(logN)-PythonJava) - Python/Java\n[154. Find Minimum in Rotated Sorted Array II](https://leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/discuss/1000562/Binary-Search-Worst-case-O(n)-PythonJava) - Python/Java\n[1695. Maximum Erasure Value](https://leetcode.com/problems/maximum-erasure-value/discuss/984977/sliding-window-map-PythonJava-O(n)) - Java/Python\n[1696. Jump Game VI](https://leetcode.com/problems/jump-game-vi/discuss/985138/Monotonic-Decreasing-Deque-O(N)-PythonJava.-DP-O(N*K)-TLE) - Python/Java\n\n\n**Hard**\n[51. N-Queens](https://leetcode.com/problems/n-queens/discuss/1000627/Backtrack-Java) - Java\n[52. N-Queens II](https://leetcode.com/problems/n-queens-ii/discuss/1000603/Backtrack-on-rows-and-iterate-over-columns-PythonJava) - Python/Java\n

Easy\n\n1656. Design an Ordered Stream - Python/Java\n1661. Average Time of Process per Machine - SQL\n1662. Check If Two String Arrays are Equivalent - Python/