feat: update solutions

[yanglbme]

No description provided.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 83.2%, saving 772.1 KB.

Filename	Before	After	Improvement	Visual comparison
solution/3900-3999/3933.Largest Local Values in a Matrix II/images/chatgpt-image-may-14-2026-01_53_19-am.png	928.2 KB	156.1 KB	83.2%	View diff

[Copilot]

Pull request overview

This PR updates LeetCode solution metadata, adds contest 502 problem pages/solutions, refreshes tooling dependencies, and applies Rust formatting cleanup across many existing solution files.

Changes:

• Adds problem 3931 implementations and documentation; adds placeholder docs for 3932–3934.
• Updates main solution/contest indexes for Weekly Contests 500–502.
• Adjusts Python/tooling setup and applies rustfmt-style formatting to Rust solutions.

Reviewed changes

Copilot reviewed 57 out of 64 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
solution/README.md	Updates Chinese solution index entries for contests 500–502.
solution/README_EN.md	Updates English solution index entries for contests 500–502.
solution/main.py	Expands contest fetch ranges and changes cached-question refresh behavior.
solution/CONTEST_README.md	Adds Chinese contest sections for Weekly 500–502.
solution/CONTEST_README_EN.md	Adds English contest sections for Weekly 500–502.
solution/3900-3999/3931.Check Adjacent Digit Differences/README.md	Adds Chinese statement and solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/README_EN.md	Adds English statement and solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/Solution.py	Adds Python solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/Solution.java	Adds Java solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/Solution.cpp	Adds C++ solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/Solution.go	Adds Go solution for 3931.
solution/3900-3999/3931.Check Adjacent Digit Differences/Solution.ts	Adds TypeScript solution for 3931.
solution/3900-3999/3932.Count K-th Roots in a Range/README.md	Adds Chinese problem page for 3932.
solution/3900-3999/3932.Count K-th Roots in a Range/README_EN.md	Adds English problem page for 3932.
solution/3900-3999/3933.Largest Local Values in a Matrix II/README.md	Adds Chinese problem page for 3933.
solution/3900-3999/3933.Largest Local Values in a Matrix II/README_EN.md	Adds English problem page for 3933.
solution/3900-3999/3934.Smallest Unique Subarray/README.md	Adds Chinese problem page for 3934.
solution/3900-3999/3934.Smallest Unique Subarray/README_EN.md	Adds English problem page for 3934.
package.json	Adds postinstall and changes Python lint-staged command.
requirements.txt	Updates Python dependency list.
lcp/main.py	Switches warning suppression to direct urllib3 import.
solution/3700-3799/3761.Minimum Absolute Distance Between Mirror Pairs/Solution.rs	Rust formatting only.
solution/3700-3799/3741.Minimum Distance Between Three Equal Elements II/Solution.rs	Rust formatting only.
solution/3700-3799/3740.Minimum Distance Between Three Equal Elements I/Solution.rs	Rust formatting only.
solution/3600-3699/3666.Minimum Operations to Equalize Binary String/Solution.rs	Rust formatting only.
solution/3600-3699/3643.Flip Square Submatrix Vertically/Solution.rs	Rust formatting only.
solution/3600-3699/3606.Coupon Code Validator/Solution.rs	Rust formatting only.
solution/3500-3599/3574.Maximize Subarray GCD Score/Solution.rs	Rust formatting only.
solution/3500-3599/3508.Implement Router/Solution.rs	Rust import ordering only.
solution/3400-3499/3433.Count Mentions Per User/Solution.rs	Rust whitespace cleanup only.
solution/3300-3399/3347.Maximum Frequency of an Element After Performing Operations II/Solution.rs	Rust import ordering only.
solution/3200-3299/3292.Minimum Number of Valid Strings to Form Target II/Solution.rs	Rust import ordering only.
solution/3200-3299/3219.Minimum Cost for Cutting Cake II/Solution.rs	Rust formatting only.
solution/3200-3299/3218.Minimum Cost for Cutting Cake I/Solution.rs	Rust formatting only.
solution/3200-3299/3213.Construct String with Minimum Cost/Solution.rs	Rust import ordering and formatting only.
solution/3200-3299/3212.Count Submatrices With Equal Frequency of X and Y/Solution.rs	Rust formatting only.
solution/3100-3199/3187.Peaks in Array/Solution.rs	Rust formatting only.
solution/3100-3199/3130.Find All Possible Stable Binary Arrays II/Solution.rs	Rust formatting only.
solution/3100-3199/3129.Find All Possible Stable Binary Arrays I/Solution.rs	Rust formatting only.
solution/3000-3099/3070.Count Submatrices with Top-Left Element and Sum Less Than k/Solution.rs	Rust formatting only.
solution/3000-3099/3013.Divide an Array Into Subarrays With Minimum Cost II/Solution.rs	Rust formatting only.
solution/2900-2999/2977.Minimum Cost to Convert String II/Solution.rs	Rust formatting only.
solution/2800-2899/2872.Maximum Number of K-Divisible Components/Solution.rs	Rust formatting only.
solution/2700-2799/2770.Maximum Number of Jumps to Reach the Last Index/Solution.rs	Rust formatting only.
solution/2700-2799/2751.Robot Collisions/Solution.rs	Rust formatting only.
solution/2500-2599/2515.Shortest Distance to Target String in a Circular Array/Solution.rs	Rust formatting only.
solution/1800-1899/1878.Get Biggest Three Rhombus Sums in a Grid/Solution.rs	Rust formatting only.
solution/1600-1699/1689.Partitioning Into Minimum Number Of Deci-Binary Numbers/Solution.rs	Rust formatting only.
solution/1500-1599/1545.Find Kth Bit in Nth Binary String/Solution.rs	Rust formatting only.
solution/1300-1399/1390.Four Divisors/Solution.rs	Rust formatting only.
solution/1300-1399/1339.Maximum Product of Splitted Binary Tree/Solution.rs	Rust import ordering and formatting only.
solution/1200-1299/1297.Maximum Number of Occurrences of a Substring/Solution2.rs	Rust formatting only.
solution/1100-1199/1161.Maximum Level Sum of a Binary Tree/Solution.rs	Rust import ordering only.
solution/1000-1099/1022.Sum of Root To Leaf Binary Numbers/Solution.rs	Rust import ordering only.
solution/0800-0899/0877.Stone Game/Solution2.rs	Rust formatting only.
solution/0800-0899/0877.Stone Game/Solution.rs	Rust formatting cleanup.
solution/0800-0899/0865.Smallest Subtree with all the Deepest Nodes/Solution.rs	Rust formatting only.
solution/0700-0799/0799.Champagne Tower/Solution2.rs	Rust formatting/newline cleanup.
solution/0700-0799/0799.Champagne Tower/Solution.rs	Rust formatting/newline cleanup.
solution/0000-0099/0085.Maximal Rectangle/Solution.rs	Rust formatting only.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.