Browse problems by topic and difficulty. 3,930 problems indexed.
| Title | Difficulty | ||
|---|---|---|---|
| Find Invalid IP Addresses | Hard | Solve | |
| Sum of Good Numbers |
| Easy |
| Solve |
| Separate Squares I | Medium | Solve |
| Separate Squares II | Hard | Solve |
| Shortest Matching Substring | Hard | Solve |
| Find Special Substring of Length K | Easy | Solve |
| Eat Pizzas! | Medium | Solve |
| Select K Disjoint Special Substrings | Medium | Solve |
| Length of Longest V-Shaped Diagonal Segment | Hard | Solve |
| Moving Average from Data Stream | Easy | Solve |
| Longest Common Prefix After at Most One Removal | Medium | Solve |
| Check If Digits Are Equal in String After Operations I | Easy | Solve |
| Maximum Sum With at Most K Elements | Medium | Solve |
| Check If Digits Are Equal in String After Operations II | Hard | Solve |
| Maximize the Distance Between Points on a Square | Hard | Solve |
| Find Products with Valid Serial Numbers | Easy | Solve |
| Maximum Coin Collection | Medium | Solve |
| Transform Array by Parity | Easy | Solve |
| Find the Number of Copy Arrays | Medium | Solve |
| Find Minimum Cost to Remove Array Elements | Medium | Solve |
| Top K Frequent Elements | Medium | Solve |
| Permutations IV | Hard | Solve |
| Find the Largest Almost Missing Integer | Easy | Solve |
| Longest Palindromic Subsequence After at Most K Operations | Medium | Solve |
| Sum of K Subarrays With Length at Least M | Medium | Solve |