https://leetcode.com/problems/find-minimum-diameter-after-merging-two-trees/description/

Diameter of 2 connected trees #hard #graph #toposort

https://leetcode.com/problems/find-largest-value-in-each-tree-row/description/

Tree layers maxes #medium

https://leetcode.com/problems/target-sum/description/


Count signs permutations to sum equal target #medium #dynamic_programming

https://leetcode.com/problems/best-sightseeing-pair/description/

Max (a[i] + a[j] + i - j), i > j #medium #arithmetics

https://leetcode.com/problems/maximum-sum-of-3-non-overlapping-subarrays/description/


3 max non-intersecting intervals #hard #dynamic_programming #sliding_window

https://leetcode.com/problems/number-of-ways-to-form-a-target-string-given-a-dictionary/description/

Ways to make target with increasing positions in words #hard #dynamic_programming

https://leetcode.com/problems/count-ways-to-build-good-strings/description/

Ways to make 01-string length of low..high #medium #dynamic_programming

https://leetcode.com/problems/minimum-cost-for-tickets/description/

Min sum buying 1,7,30-days tickets to travel all days #medium #dymanic_programming

Anything you will do on a daily basis will gain x365 improvement.

Here is my post from 1 year ago https://t.me/leetcode_daily_unstoppable/456

Happy new year 🎄

https://leetcode.com/problems/maximum-score-after-splitting-a-string/description/

Max(left_zeros + right_ones) #easy

https://leetcode.com/problems/count-vowel-strings-in-ranges/description/

Count words[q[0]..q[1]] starting and ending with "aeiou" #medium

https://leetcode.com/problems/number-of-ways-to-split-array/description/


Count splits left_sum >= right_sum #medium #prefix_sum

https://leetcode.com/problems/unique-length-3-palindromic-subsequences/description/


Count palindroms of length 3 #medium

https://leetcode.com/problems/shifting-letters-ii/description/


Apply from..to, direction shifts to string chars #medium #line_sweep

https://leetcode.com/problems/minimum-number-of-operations-to-move-all-balls-to-each-box/description/


Sum distances to all 1 for every position #medium #prefix_sum

https://leetcode.com/problems/string-matching-in-an-array/description/


All substrings #easy

https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/description/


Count prefix-suffix matched pairs #easy

https://leetcode.com/problems/counting-words-with-a-given-prefix/description/


Count words with prefix #easy

https://leetcode.com/problems/word-subsets/description/



Words containing all chars of words2 #medium

https://leetcode.com/problems/construct-k-palindrome-strings/description/

Can make k palindromes from string? #medium

https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/description/


Balance parenthesis with wildcards #medium