Question of the day DAY 1: https://leetcode.com/problems/palindrome-number/
DAY2: https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
DAY 3: https://leetcode.com/problems/assign-cookies/
DAY 4: https://leetcode.com/problems/minimum-index-sum-of-two-lists/
DAY 5: https://leetcode.com/problems/can-place-flowers/
DAY 6: https://leetcode.com/problems/contains-duplicate/
DAY 7: https://leetcode.com/problems/maximum-product-of-three-numbers/
DAY 8: https://leetcode.com/problems/search-insert-position/
DAY 9: https://leetcode.com/problems/island-perimeter/
DAY 10: https://leetcode.com/problems/verifying-an-alien-dictionary/
DAY 11: https://leetcode.com/problems/container-with-most-water/
DAY 12: https://leetcode.com/problems/longest-common-prefix/
DAY 13: https://leetcode.com/problems/roman-to-integer/
DAY 14: https://leetcode.com/problems/valid-palindrome/
DAY 15: https://leetcode.com/problems/isomorphic-strings/
DAY 16: https://leetcode.com/problems/add-strings/
DAY 17: https://leetcode.com/problems/student-attendance-record-i/
DAY 18: https://leetcode.com/problems/excel-sheet-column-title/
DAY 19: https://leetcode.com/problems/make-the-string-great/
DAY 20: https://leetcode.com/problems/word-break/
DAY 21: https://leetcode.com/problems/lemonade-change/
DAY 22: https://leetcode.com/problems/minimum-cost-of-buying-candies-with-discount/