Lucky Fives
You are given a sequence $a_{1}, a_{2}, \ldots, a_{N}$ of non-negative integers. Your task is to process $Q$ queries of the following format: each query is described by two integers $L \leq R$ and asks to calculate the number of triples $(i, j, k)$, such that $L < i < j < k < R$ and $a_{L} > a_{i} < a_{j} > a_{k} < a_{R}$. ### Input - The first line of the input contains two integers $N$ and $
HINT LADDERno hints yet
L1 Observation
L2 Technique
L3 Approach
L4 Pseudo-code
🔒
L5 Full solution
L5 unlocks only if you insist twice
solution.cppC++17
CodeSearch Tutor
Hints, not spoilers — it won’t hand over the full solution unless you insist.
Sign in to chat with the tutor and save your progress.
Sign in to start