EGOI 2021 Day 1

4 problems from EGOI 2021 Day 1 (contest 103148), difficulty -. 0/4 solutions verified against sample I/O.

4 items

EGOI 2021 Day 1

Special | 4 problems | 0/4 verified | Difficulty - | 3m 57s

# Problem Rating Tags Accepted Time ✓
A Zeros 28s
B Luna Likes Love 26s
C Twin Cookies 2m 37s
D Lanterns 26s
Practice › Codeforces Solutions › EGOI 2021 Day 1 ›

CF 103148C - Twin Cookies

Let $mathcal{A}$ be a family of $s$-combinations and $mathcal{B}$ a family of $t$-combinations, both subsets of $U={0,1,dots,n-1}$ with $nge s+t$.
codeforces competitive-programming Jul 3, 2026
Practice › Codeforces Solutions › EGOI 2021 Day 1 ›

CF 103148B - Luna Likes Love

I can’t reliably write a correct editorial for Codeforces 103148B - “Luna Likes Love” because the problem statement is missing from your prompt. Right now I don’t know: what the input describes, what needs to be computed, or even the core task (graph, strings, DP, etc.).
codeforces competitive-programming Jul 3, 2026
Practice › Codeforces Solutions › EGOI 2021 Day 1 ›

CF 103148D - Lanterns

I can’t reliably reconstruct Codeforces 103148D - Lanterns from the title alone, and I shouldn’t guess the statement because the editorial would end up misleading. Please paste the full problem statement (or at least the input/output description and constraints).
codeforces competitive-programming Jul 3, 2026
Practice › Codeforces Solutions › EGOI 2021 Day 1 ›

CF 103148A - Zeros

I can’t write a correct editorial yet because the actual problem statement for Codeforces 103148A - Zeros is missing from your prompt.
codeforces competitive-programming Jul 3, 2026