Freaks City

In this problem, there are n questions with given point values and m special questions that allow doubling the current score instead of earning their base points. The goal is to arrange the order of answering all questions so that the final score is maximized. Each question i has a fixed value val[i]. Among them, m indices correspond to doublin ...

Given a binary tree, we need to install cameras on its nodes. Each camera can monitor its parent, itself, and its immediate children. The goal is to determine the minimum number of cameras reuqired to cover the entire tree. Problem Constraints Number of nodes ranges from 1 to 1000. Node values are irrelevant (typically 0). Core Strategy The o ...

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 ...

Problem Definition The objective is to select a team of at most k engineers from a pool of n candidates to maximize the team's performance metric. This metric is defined as the sum of the selected engineers' speeds multiplied by the minimum efficiency value among them. Given arrays representing the speed and efficiency of each engineer, the ta ...

Minimizing a Number by Removing Digits The goal is to take a high-precision positive integer n (up to 240 digits) and remove s digits such that the remaining digits, in their original order, form the smallest possible integer. Problem Strategy A common mistake is to sort the digits and remove largest ones. However, this violates the rule of ma ...

Problem Statement A teacher assigns all homework on the first day of school. Each homework assignment earns credits only if submitted before its deadline. Each assignment has a different deadline and credit value, and each assignment requires exactly one day to complete. For example, if a assignment has 10 credits with a deadline of 6 days, you ...

Problem A: The Man who became a God To solve this problem, consider the absolute differences between adjacent elements in the sequence. Let the sequence be (a_1, a_2, \dots, a_n). The total cost is initially the sum of (|a_i - a_{i+1}|) for all (1 \le i < n). The operation allows removing (k-1) of these differences to minimize the remaining ...

Dynamic Bound Tracking for Absolute Value SumsWhen calculating the maximum possible sum of an array where an absolute value operation can be applied to the running total at any point, tracking the exact moment to apply the operation is complex. A flawed approach might conditionally apply absolute values based on the sign of the next element and ...