A. Even Subset Sum Problem

滴答滴答---题目链接 

A. Even Subset Sum Problem time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output You are given an array aa consisting of nn positive integers. Find a non-empty subset of its elements such that their sum is even (i.e. divisible by 22) or determine that there is no such subset. Both the given array and required subset may contain equal values. Input The first line contains a single integer tt (1≤t≤1001≤t≤100), number of test cases to solve. Descriptions of tt test cases follow. A description of each test case consists of two lines. The first line c