LeetCode 1281. Subtract the Product and Sum of Digits of an Integer
Study Plan - Programming Skills Day 2 Operator。 又是奇怪的算數題。
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LeetCode 1254. Number of Closed Islands
Study Plan - Graph Theory。
LeetCode 228. Summary Ranges
每日題。沒注意到竟然會輸入空陣列，噴了WA，尷尬。
LeetCode 2002. Maximum Product of the Length of Two Palindromic Subsequences
好久以前某次周賽TLE沒過的，今天又TLE好幾次才過。
LeetCode 1523. Count Odd Numbers in an Interval Range
Study Plan - Programming Skills Day 1 Basic Data Type。 奇怪的數學題。