Problem - D - Codeforces 2 elements with same value should never co-exist since it will be an even number, which will not be a prime number when summed, unless they were both 1. 2 even numbers nor 2 odd numbers can not co-exist as well. So…

Problem - E - Codeforces pekempeyさんの記事が参考になりました。ありがとうございます。 pekempey.hatenablog.com Trie はあまり慣れなかったのでいい練習になった。 #include <bits/stdc++.h> using namespace std; const int MAXN = 1e6 + 6; const int MAXK = 1e9 + 9</bits/stdc++.h>…