Freaks City

The Inclusion-Exclusion Principle The Inclusion-Exclusion Principle is a fundamental concept in combinatorics that provides a method for calculating the size of the union of multiple sets. It addresses the problem of avoiding overcounting elements that belong to multiple sets by systematically accounting for intersections. Codeforces 547C: Mi ...

Given an array where every element appears twice except two elements that appear only once, find those two unique numbers. Approach 1: Frequency Counting with Index Mapping This method uses a temporary array to count occurrences by treating the original values as indices in the counting array. #include <stdio.h> int main() { int arr[ ...

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 ...