Educational Codeforces Round 158 (Rated for Div. 2) - Virtual Participation Notes

A. Line Trip The fuel tank must be sufficient to cover the distance between every pair of consecutive gas stations, and must also allow returning from the destination back to the start point without refueling at the final station. Click to view solution code #include <bits/stdc++.h> using namespace std; int main() { ios::sync_with_st ...

Posted on Mon, 21 Sep 2026 16:54:37 +0000 by bubbadawg

Efficient Calculation of String Sorting Distance Using Tries and 2D Range Queries

Problem Definition Given $n$ strings $T_1, T_2, \dots, T_n$, each of length $len$. Define $f(a, b)$ as the minimum number of sorting operations required on substrings of $a$ to make it identical to $b$. If it is impossible to transform $a$ into $b$ via substring sorting, $f(a, b) = 1337$. The objective is to compute: Analysis of Function Value ...

Posted on Mon, 07 Sep 2026 16:43:49 +0000 by ninedoors

Maximum Size Set with No Fixed Differences

Problem Statement Given three positive integers $n$, $x$, and $y$, we need to find the maximum size of a set $S$ satisfying: $S \subseteq {1, 2, \ldots, n}$ For any $a \in S$ and $b \in S$, $|a - b| \neq x$ and $|a - b| \neq y$ Output the maximum possible cardinality of $S$. Constraints: $1 \leq n \leq 10^9$, $1 \leq x, y \leq 22$ Observation ...

Posted on Wed, 02 Sep 2026 16:43:33 +0000 by mark bowen

Solutions for Codeforces Round 1053 (Div. 2) Problems A through E

Problem A: Incremental SubarrayBy examining the pattern of numbers, we observe that if the given sequence \(a\) does not form a contiguous interval, the result is always 1. Otherwise, we check the last element \(a_m\) of the sequence. The answer becomes \(n - a_m + 1\), representing the count of integers from \(a_m\) to \(n\).#include using na ...

Posted on Wed, 26 Aug 2026 16:09:29 +0000 by james13009

Educational Codeforces Round 157 Div. 2: Virtual Contest Analysis

Problem A: Treasure Chest We need to calculate the minimum time to reach the chest and return to the start, given the ability to pull the chest towards the key for a maximum distance of k. There are two scenarios based on the relative positions of the chest pos_chest and the key pos_key: If pos_key <= pos_chest: We pickup the key on the way ...

Posted on Mon, 17 Aug 2026 16:45:03 +0000 by vicodin

Solutions for CodeForces Round 656 Division 3

A - Three Pairwise Maximums Given three pairwise maximum values, determine if they can be derived from three positive integers. The solutoin involves sorting the input values and verifying consistency conditions. #include <iostream> #include <algorithm> using namespace std; void solve() { int nums[3]; cin >> nums[0] & ...

Posted on Fri, 07 Aug 2026 17:03:21 +0000 by lewisstevens1

Codeforces VP Contest Solutions

A. Omkar and Password Given a sequence of integres, we can merge adjacent disitnct elements into their sum. The goal is to minimize the final sequence length. If all elements are equal, no merges are possible and the result is the original length. Otherwise, we can always reduce the sequence to a single element by repeatedly merging with the ma ...

Posted on Fri, 07 Aug 2026 16:26:07 +0000 by Iceman512

Codeforces Round 165 Editorial - Problem Analysis

Problem A: Two Friends There are two possible scenarios: There exists a pair where person A's best friend is B, and B's best friend is A. In this case, just inviting these two individuals suffices. No such mutual friendship exists. If person A's best friend is B, and B's best friend is C, then inviting A, B, and C ensures both A and B attend. ...

Posted on Sat, 01 Aug 2026 17:04:36 +0000 by penguinmasta

Solutions for Codeforces Round 899 Division 2 Problems

Problem A: Minimum Non-Conflicting Value Sequence Given a sequence of intgeers, find the smallest positive integer that can be added to make all elements distinct while maintaining increasing order. #include<iostream> #include<vector> using namespace std; int find_min_increment(vector<int>& nums) { int current = 1; ...

Posted on Sat, 01 Aug 2026 16:13:35 +0000 by chaffinator

Solutions for Codeforces Round 855 (Div. 3)

Problem A: Is It a Cat? Givan a string and its length, output "YES" if the string satisfies the following conditions; otherwise, output "NO": The string consists of exactly four segments. Each segment contains only one letter (case-insensitive), in the exact sequence: 'm', 'e', 'o', 'w'. There are t test cases. Approach Th ...

Posted on Mon, 27 Jul 2026 17:02:01 +0000 by mindrage00