20260331

checked refunds & balance
full-time job (hard)
LeetCode
- 338. Counting Bits
  - with C++
10.5 km run
- I think I should skip running tomorrow

#include <vector>

class Solution {
public:
    std::vector<int> countBits(int n) {
        std::vector<int> counts(n + 1, 0);
        for (int i = 0; i < n + 1; ++i) {
            int prefix_count = counts[i / 2];
            int last_digit = i % 2;
            counts[i] = prefix_count + last_digit;
        }

        return counts;
    }
};

20260330

8k jog, push ups, arm curl, 6.5k jog
full-time job
LeetCode
- 338. Counting Bits
  - Dynamic Programming
- 3885. Design Event Manager
  - Banker’s Method
- 322. Coin Change (code review)
- 310. Minimum Height Trees
Essential Words for the TOEFL
- circumvent, elude, avert, astute, arduous, brazen

20260329

5 km walk, 8 km jog, push ups
- My legs feel really tight. Maybe I will skip jogging tomorrow.
LeetCode
- 225. Implement Stack using Queues
- 139. Word Break
  - code review
  - Tabulation + Memoization
- 3885. Design Event Manager

20260328

8 km jog, 5 km walk, 2.5 km walk, push ups, arm curl
LeetCode
- 283. Move Zeroes
  - Dutch national flag problem
- 310. Minimum Height Trees
  - https://github.com/huyfififi/coding-challenges/pull/63
- Weekly Content 495
  - I started considering a career change (n 回目)

20260327

full-time job (light)
10 km jog, 6 km walk, push ups
LeetCode
- 62. Unique Paths (code review)
- 310. Minimum Height Trees

20260326

full-time job
LeetCode
- 347. Top K Frequent Elements (code review)
- 105. Construct Binary Tree from Preorder and Inorder Traversal (code review)
8 km jog, push ups, 4 km walk

20260325

I haven’t felt any motivation since my wife went on a trip to Japan (causal relationship unconfirmed).

A smart watch (Coros) should be arriving tomorrow. Looking forward to using it daily.

full-time job
push ups, 60 minutes walk

20260324

full-time job
LeetCode
- 141. Linked List Cycle (code review)
- 438. Find All Anagrams in a String
60 minutes walk, push ups, arm curl

20260323

I ate too much…

full-time job
LeetCode
- 703. Kth Largest Element in a Stream (code review)
- 438. Find All Anagrams in a String
  - Python’s ord() returns Unicode code point
- 310. Minimum Height Trees
push ups, arm curl, 40 minutes jog
ordered COROS

20260322

LeetCode
- 39. Combination Sum (code review)
- 33. Search in Rotated Sorted Array (code review)
- 79. Word Search
  - replied to review comments
- 11. Container with Most Water
- 387. First Unique Character in a String (code review)
- 17. Letter Combinations of a Phone Number
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 438. Find All Anagrams in a String
  - https://github.com/huyfififi/coding-challenges/pull/62
40 minutes jog

20260321

replied to 246
LeetCode
- 78. Subsets (code review)
- 79. Word Search
  - https://github.com/huyfififi/coding-challenges/pull/61
- Weekly Contest 494
  - I didn’t do well, but nice try!
- 141. Linked List Cycle (code review)
some work for my full-time job
push ups, 30 minutes jog

20260320

I ate too much today… help!

full-time job
spent some time with my wife
LeetCode
- 17. Letter Combinations of a Phone Number (replies to review comments)
- 46. Permutations (code review)
- 139. Word Break (code review)
https://api.dicebear.com/7.x/identicon/svg?seed=huyfififi
- $ rsvg-convert -w 512 -h 512 huy_dicebear.svg -o --background-color=white output.png
- Identicon
  - “An Identicon is a visual representation of a hash value…”
45 minutes jog

20260319

full-time job
LeetCode
- 17. Letter Combinations of a Phone Number
  - https://github.com/huyfififi/coding-challenges/pull/60
drawing

20260318

full-time job
LeetCode
- 1. Container With Most Water
  - https://github.com/huyfififi/coding-challenges/pull/59
- 98. Validate Binary Search Tree (code review)
push ups, 35 mimutes run
drawing

20260317

full-time job
20 minutes walk, push ups, 40 minutes jog
LeetCode
- 105. Construct Binary Tree from Preorder and Inorder Traversal
  - https://github.com/huyfififi/coding-challenges/pull/58
- 703. Kth Largest Element in a Stream (code review)
- 103. Binary Tree Zigzag Level Order Traversal (code review)
- 11. Container With Most Water

20260316

full-time job
reached out to Izawa-san
LeetCode
- 105. Construct Binary Tree from Preorder and Inorder Traversal
arm curl, push ups, 30 minutes run

20260315

LeetCode
- 62. Unique Paths (code review)
- 8. String to Integer (code review)
- 105. Construct Binary Tree from Preorder and Inorder Traversal
Essential Words for the TOEFL
- brazen, influx, adage
The Technological Republic
- indebt, whim
drawing
renewed TLS for my Mastodon instance

20260314

The Technological Republic
- treatise, imperative, entail, reliant, whim, insurgent, improvise, relegate, delegate, innocuous, vagary
Essential Words for the TOEFL
- adverse, haphazard, circumvent, benign, astute, instigate, baffle, brash, conceal, engross, account for, dormant, drab, eclectic, mortify, overbearing, burgeon, elude, oblivious, arduous, arid, avert, defy, feign, indiscriminate, perilous, conscientious, encompass, infancy, abysmal, discreetly, endemic, inordinate, inundate, nominal, brazen, limber, look over, coherent, accentuate, alleviate, influx, predominant, allude, overtly, upstanding, aptly, profuse, aggravating, debilitating, trite, adage, caliber, precarious, sporadic, wanton
LeetCode
- 1051. Height Checker
arm curl, push ups, 30 minutes jog
drawing

20260313

full-time job
LeetCode
- 268. Missing Number
- 8. String to Integer (atoi)
- 703. Kth Largest Element in a Stream (code review)
- 82. Remove Duplicates from Sorted List II (code review)
1 hour jog

20260312

full-time job (hard, AI makes iterations super fast. I’m somewhat tired.)
LeetCode
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 5. Longest Palindromic Substring
- 8. String to Integer (atoi)
arm curl, push ups, 45 minutes jog

20260311

full-time job (office)
LeetCode
- 98. Validate Binary Search Tree (code review)
- 199. Binary Tree Right Side View
- 78. Subsets
- 54. Spiral Matrix
40 minutes run

20260310

LeetCode
- 62. Unique Paths
  - https://github.com/huyfififi/coding-challenges/pull/57
- 199. Binary Tree Right Side View
  - received feedback
    - moving if condition out of for loop
    - operations with side effects
- 105. Construct Binary Tree from Preorder and Inorder Traversal
- 141. Linked List Cycle (code review)
full-time job
arm curl, push ups, 30 minutes run

When you compile TypeScript, the output is plain JavaScript.

20260309

full-time job (hard)
15 minutes walk, 30 minutes run, push ups
LeetCode
- 78. Subsets
  - backtracking is easy
  - still need some time to digest all_subsets += [subset + [num] for subset in all_subsets]
- 54. Spiral Matrix
- 199. Binary Tree Right Side View
- 5. Longest Palindromic Substring
- 62. Unique Paths

20260308

Negative feelings motivate me to do more LeetCode.

LeetCode
- 66. Plus One (code review)
- 8. String to Integer (atoi)
- 416. Partition Equal Subset Sum
- 139. Word Break
- 54. Spiral Matrix
  - https://github.com/huyfififi/coding-challenges/pull/53
- 78. Subsets
  - https://github.com/huyfififi/coding-challenges/pull/54
- 199. Binary Tree Right Side View
  - https://github.com/huyfififi/coding-challenges/pull/55
- 5. Longest Palindromic Substring
25 minutes run

20260307

LeetCode
- 416. Partition Equal Subset Sum
- 207. Course Schedule
- 9. String to Integer (atoi)
  - PR: https://github.com/huyfififi/coding-challenges/pull/52
- 66. Plus One (code review)
  - Even for this type of simple questions, I still face bugs sometimes :sob:
push ups

20260306

checked review comments on my PR
full-time job
20 minutes walk, 45 minutes jog
LeetCode
- 416. Partition Equal Subset Sum
  - checked review comments
    - For small types, passing by value may be faster than passing by reference, as the latter might involve multiple hops of referencing
    - early return check (prune operations)
- 139. Word Break (DP, Trie)
- 133. Clone Graph
drawing

20260305

full-time job (hard)
replied to Oda-san
LeetCode
- 416. Partition Equal Subset Sum
- 139. Word Break
  - DP, Trie, pay attention to invariants
push ups, arm curl, 35 minutes jog

#include <cstdint>
#include <string>
#include <vector>

class Solution {
public:
    bool wordBreak(const std::string& s, const std::vector<std::string>& wordDict) {
        std::vector<uint8_t> possible(s.size() + 1);
        possible[0] = 1;
        for (size_t i = 0; i < s.size(); ++i) {
            for (const auto& word : wordDict) {
                if (i + word.size() > s.size()) { continue; }
                possible[i + word.size()] |= possible[i] && !s.compare(i, word.size(), word);
            }
        }

        return possible[s.size()];
    }
};

20260304

full-time job
- many meetings
LeetCode
- 33. Search in Rotated Sorted Array (code review)
replied to Oda-san

20260303

took a long nap to recover
full-time job (hard)
- - on call
LeetCode
- 139. Word Break
  - PR: https://github.com/huyfififi/coding-challenges/pull/50
- 416. Partition Equal Subset Sum
  - PR: https://github.com/huyfififi/coding-challenges/pull/51
chest press, 30 minutes jog
drawing

20260302

so many misc work cancelling trips :sob:
full-time job (very hard)
LeetCode
- 695. Max Area of Island (code review)
- 139. Word Break
chest press, 40 minutes jog

20260301

misc work for my full-time position
- communications regarding my India trip
tried TurboTax
- It seems our case is not covered
printed out documents
LeetCode
- 139. Word Break
  - Trie
50 minutes jog, push ups

TODO:

close Wells Fargo brokerage account

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