Practice Problems

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Median of Two Sorted Arrays
Array Binary Search Divide and Conquer
Hard
0.0%
+50 coins
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K Closest Points to Origin
Array Divide and Conquer Heap (Priority Queue) Math Sorting
Medium
0.0%
+25 coins
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Binary Tree Level Order Traversal
Breadth-First Search Tree
Medium
0.0%
+25 coins
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Coin Change
Array Breadth-First Search Dynamic Programming
Medium
0.0%
+25 coins
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Number of Islands
Array Breadth-First Search Depth-First Search Matrix Union Find
Medium
0.0%
+25 coins
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Merge Intervals
Array Sorting
Medium
0.0%
+25 coins
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Longest Substring Without Repeating Characters
Hash Table Sliding Window String
Medium
0.0%
+25 coins
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Maximum Subarray
Array Divide and Conquer Dynamic Programming
Easy
0.0%
+10 coins
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Valid Parentheses
Stack String
Easy
0.0%
+10 coins
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Two Sum
Array Hash Table
Easy
0.0%
+10 coins
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