Flip the Prefix

CodeChefRating 1758Open on judge ↗

You are given a **binary** string $S$ of length $N$ and an integer $K$. You can perform the following operation on the string: - Select a *prefix* of the string $S$ and flip all the characters of the prefix. A flip corresponds to changing $0$ to $1$ and vice-versa. Find the **minimum** number of operations required to obtain a substring of length $K$ such that all characters of the substring are

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.

voice by Sarvam AI