Freaks City

Given a directed graph with nodes labeled 0 through n-1, where edge are colored either red or blue and may include self-loops and parallel edges. Each [i, j] pair in red_edges represents a red directed edge from node i to node j. Similarly, each [i, j] pair in blue_edges represents a blue directed edge from node i to node j. Compute an array re ...

Given an integer array nums, find and return the maximum sum of elements that is divisible by three. Examples Example 1: Input: nums = [3,6,5,1,8] Output: 18 Explanation: Choose numbers 3, 6, 1, and 8. Their sum is 18 (the maximum sum divisible by three). Example 2: Input: nums = [4] Output: 0 Explanation: 4 is not divisible by 3, so no number ...

Factorization into Factorial Divisors Given integers (n) and (m) where (1 \le m \le n!) and (n \le 20), decompose (m) into a sum of at most (n) divisors of (n!). A solution is guaranteed to exist. Define a sequence (d_i = \frac{n!}{i!}) for (i) from 1 to (n). By iterating downwards from (i=n) to (1) and greedily subtracting the largest possible ...

A. Programming Contest This problem is a straightforward implementation task. The idea is to count the number of valid years betweeen two given years, excluding specific invalid years provided in the input. void solve() { int n, m; std::cin >> n; std::vector<int> invalidYearFlag(10000, 0); // Assuming a safe upper bound ...

The Massage Therapist Scheduling Problem Problem link: https://leetcode.cn/problems/the-masseuse-lcci/ A renowned massage therapist receives a continuous stream of appointment requests. Each appointment can be accepted or declined. Due to the need for rest periods between sessions, she cannot accept consecutive appointments. Given a sequence of ...

Problem A: String Substitution Logic Process a single input line character by character. Output each character sequentially. If the current character is a dot, append the string xixixi. to the output stream immediately. #include <iostream> #include <string> using namespace std; int main() { ios_base::sync_with_stdio(false); ...

Point and Edge Divide and Conquer Point and edge divide and conquer are algorithmic techniques that extend the concept of sequence divide and conquer to tree structures. The core idea involves selecting a "center" (a node or an edge) to partition the tree into smaller, independent sub-problems. To ensure efficiency and balance, we spe ...

Problem 1: Maximum Goals and Assists Problem Overview Given two arrays representing goals and assists for multiple players, process queries that ask for the maximum total balls needed under different matching scenarios. Key Observations The problem essentially asks for the maximum value among three distinct scenarios: Scenario 1: Each assist ca ...

The elimination rule—removing consecutive identical elements when their count reaches a threshold $k$—suggests an interval dynamic programming approach. A two-dimensional DP state is insufficient because it cannot capture how the leftmost element in a segment is eventually removed. To resolve this, we introduce a third dimension that tracks how ...

Problem 1: Dumpling Purchase Optimization The problem reduces to a daily deciison: buy dumplings at the current price or rely on an earlier purchase plus storage cost. The total expense for day i if we buy on day j ≤ i is price[j] + c*(i - j). This can be rewritten as (price[j] - c*j) + c*i. Thus we can maintain the minimum value of price[j] - ...