Hashmaps

Two Sum and Contains Duplicate were warm-ups. This section makes hashmaps the main tool. What you already know from Foundations + Arrays: A dict gives O(1)…

• Hashmaps — Overview→
• LC-347. Top K Frequent Elements→
• LC-128. Longest Consecutive Sequence→
• LC-560. Subarray Sum Equals K→
• LC-523. Continuous Subarray Sum→
• LC-974. Subarray Sums Divisible by K→
• Hashmaps Review→

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