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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 ...