EdgeCase
The Child and Binary Tree
3100
combinatorics
divide and conquer
fft
Solve on Codeforces
Login to submit
C++
Python
Java
C
Rust
Run (Ctrl+↵)
stdin
custom input
output
Run your code to see output here.
AI Assistant
Analysis
Test Cases
✕
Use "AI Analyze" or "Gen Tests" to get started.