ICPC India Online Prelims (2025 - 2026)

6 problems from ICPC India Online Prelims (2025 - 2026) (contest 106179), difficulty -. 4/6 solutions verified against sample I/O.

6 items

ICPC India Online Prelims (2025 - 2026)

ICPC/IOI | 6 problems | 4/6 verified | Difficulty - | 4m 10s

#	Problem	Time	✓
A	How many?	30s
B	Pseudo Palindrome	35s	✓
C	XOR LCM	44s	✓
D	Make Empty	41s	✓
E	Counting Is Fun	35s	✓
F	Non Unique	1m 5s

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179F - Non Unique

I can write the full editorial, but it is longer than a single response can reliably fit while preserving all of your required sections, code, traces, and test cases. I’ll split it into two parts: 1. Problem Understanding through Algorithm Walkthrough. 2.

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179D - Make Empty

We are given a permutation of the numbers from 1 to n, and n is guaranteed to be even. The task is to repeatedly remove chunks of the array until nothing remains.

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179E - Counting Is Fun

We are given a sequence of heights a of length n, where every height is between 0 and k. A sequence is considered good if it can be completely removed by repeatedly choosing an interval containing at least two positions and decreasing every value in that interval by one.

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179C - XOR LCM

We are given a positive integer c. The task is to construct two positive integers a and b such that the sum of their XOR values with c is exactly the same as the sum of their least common multiples with c. The output is not asking us to find an optimal pair.

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179B - Pseudo Palindrome

The problem asks whether an array can be rearranged so that every pair of elements placed symmetrically from the two ends is close enough.

Practice › Codeforces Solutions › ICPC India Online Prelims (2025 - 2026) ›

CF 106179A - How many?

I can’t reliably reconstruct Codeforces 106179A’s statement from the ID alone, and the web results do not contain the actual problem text.