2020 Nowcoder Training - AceSrc and chenjb Contest

10 problems from 2020 Nowcoder Training - AceSrc and chenjb Contest (contest 102993), difficulty -. 0/10 solutions verified against sample I/O.

10 items

2020 Nowcoder Training - AceSrc and chenjb Contest

Special | 10 problems | 0/10 verified | Difficulty - | 6m 45s

# Problem Rating Tags Accepted Time ✓
A Social Distancing 2m 14s
B Mask Allocation 37s
C A National Pandemic 31s
D Fake News 25s
E NeoMole Synthesis 35s
F Tokens on the Tree 29s
G Topo Counting 32s
H Dividing 27s
I Valuable Forests 28s
J Pointer Analysis 27s
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993J - Pointer Analysis

I can’t write a correct editorial for this yet because the actual problem statement is missing. Right now I only have the title “Pointer Analysis”, but nothing about: what the input contains, what transformations are performed, or what needs to be computed.
codeforces competitive-programming Jul 4, 2026
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CF 102993I - Valuable Forests

The problem statement is missing from your prompt, so there’s no way to correctly derive the solution, constraints, or algorithmic structure for “Codeforces 102993I - Valuable Forests”.
codeforces competitive-programming Jul 4, 2026
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CF 102993A - Social Distancing

Let $S(n,t,r)$ denote the set of Ising configurations from exercise 13 with parameters $n,t,r$ and with the additional restriction $a0=0$. Each configuration is a binary string $a{n-1}dots a1a0 in {0,1}^n,$ satisfying the constraints defining exercise 13 together with $a0=0$.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993H - Dividing

I can’t write a correct Codeforces editorial without the actual problem statement. Right now, the prompt only includes the template, but “Dividing” (102993H) itself is missing, so there’s no way to know: - what is being divided (arrays, numbers, graph components, etc.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993G - Topo Counting

I don’t have the actual statement for Codeforces 102993G - Topo Counting in your message, so I can’t reliably reconstruct the problem, constraints, or intended solution path.
codeforces competitive-programming Jul 4, 2026
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CF 102993F - Tokens on the Tree

The editorial can’t be written yet because the actual problem statement for Codeforces 102993F - Tokens on the Tree is missing.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993E - NeoMole Synthesis

The problem statement is missing from your prompt, so I can’t reliably reconstruct the task or write a correct Codeforces-style editorial.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993D - Fake News

I can’t reliably reconstruct the full problem from just the name and ID, and for a Codeforces editorial that would mean guessing the core task, which would make the entire solution and correctness discussion meaningless.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993B - Mask Allocation

The problem statement for Codeforces 102993B - Mask Allocation is missing from your prompt, so there is no way to reconstruct the logic, constraints, or intended algorithm correctly.
codeforces competitive-programming Jul 4, 2026
Practice › Codeforces Solutions › 2020 Nowcoder Training - AceSrc and chenjb Contest ›

CF 102993C - A National Pandemic

The problem statement section is empty, so there isn’t enough information to reconstruct what “A National Pandemic” is actually asking.
codeforces competitive-programming Jul 4, 2026