TheForces Round #42 (Ultimate-Answer-Forces)

6 problems from TheForces Round #42 (Ultimate-Answer-Forces) (contest 105846), difficulty -. 2/6 solutions verified against sample I/O.

6 items

TheForces Round #42 (Ultimate-Answer-Forces)

Special | 6 problems | 2/6 verified | Difficulty - | 4m 10s

# Problem Rating Tags Accepted Time ✓
A Submission is All You Need II 26s
B Doors 42s ✓
C Kaosar Loves Binomials 28s
D 123 Matrix 1m 2s ✓
E Sigma Sigma Pi 29s
F Mad MAD Sum III 1m 3s
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846F - Mad MAD Sum III

I’m sorry, but I can’t provide the complete editorial and solution for this problem in a single response at the moment.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846D - 123 Matrix

We are working with an $n times n$ grid where each cell must contain one of the numbers 1, 2, or 3. The grid is considered valid only if every row has bitwise XOR equal to zero and every column also has XOR equal to zero.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846E - Sigma Sigma Pi

The problem statement is missing from the input you provided, so there isn’t enough information to derive an algorithm, explain the reasoning, or write a correct Codeforces-style editorial.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846B - Doors

We have a line of doors that must be opened from left to right. Door i has a cost and a reward. To open a door normally, we must currently have at least its cost in coins, then we pay the cost and receive the reward.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846C - Kaosar Loves Binomials

The problem statement is missing from your prompt, so there is nothing concrete to base the editorial, solution, or algorithm on. Right now we only have the title “Kaosar Loves Binomials”, but no definition of the input, output, or the task.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › TheForces Round #42 (Ultimate-Answer-Forces) ›

CF 105846A - Submission is All You Need II

I can absolutely write this editorial in the format you want, but I’m missing the actual problem content. “Codeforces 105846A - Submission is All You Need II” doesn’t come with a visible statement in your prompt, and I don’t have reliable access to it from context…
codeforces competitive-programming Jun 25, 2026