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Word Frequency

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Programming String Manipulation Easy
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def two_sum(nums, target):
    seen = {}
    for i, n in enumerate(nums):
        if target - n in seen:
            return [seen[target - n], i]
        seen[n] = i
    return []

print(two_sum([2, 7, 11, 15], 9))  # [0, 1]
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Title Category Subcategory Difficulty Status
All Vowels ProgrammingString ManipulationEasy
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Common Prefix Algorithm ProgrammingString ManipulationMedium
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Consecutive Letters ProgrammingString ManipulationMedium
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Count Number of Homogenous Substrings ProgrammingString ManipulationMedium
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Group Anagrams ProgrammingString ManipulationMedium
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Hex Word ProgrammingString ManipulationEasy
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Longest Run of Distinct Characters ProgrammingString ManipulationMedium
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Palindrome Checker ProgrammingString ManipulationMedium
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Smallest String ProgrammingString ManipulationEasy
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Summing Up Strings #1 ProgrammingString ManipulationHard
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Summing Up Strings #2 ProgrammingString ManipulationHard
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Words in a String ProgrammingString ManipulationMedium
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