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PROBLEMS/TWO POINTERS/K-SUM PATTERN (3SUM, 4SUM)

K-Sum Pattern (3Sum, 4Sum) Problems

5 K-Sum Pattern (3Sum, 4Sum) problems on LeetCode, a Two Pointers interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.

#PROBLEMDIFFELOIMPPATTERNS
13SumMedium153491
Sorting + Comparison · Complement Search (Two Sum Pattern)
24SumMedium158172
Sorting + Comparison
33Sum SmallerPREMIUMEasy137862
Sorting + Comparison · Standard Binary Search
43Sum ClosestMedium142758
Sorting + Comparison
53Sum With MultiplicityMedium171153
Frequency Counting / Hash Map Lookup · Combinatorics
MORE TWO POINTERS PATTERNS
Opposite-Direction (Converging)Same-Direction (Fast/Slow on Arrays)K-Sum Pattern (3Sum, 4Sum)
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