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  1. All Contests
  2. ProjectEuler+
  3. Project Euler #45: Triangular, pentagonal, and hexagonal
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Project Euler #45: Triangular, pentagonal, and hexagonal

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  • s_mostafa_a
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    First generate all pentagonal, triangle and hexagonal numbers below 2*10^14 . Then for each test case, use binary search to find the answer.