I can see that the result depends only on frequency of distinct values, and seems like some combinatorial trick, it's a made up question but seems standard, what is the most optimal solution for lengthNNarray? there are two ways to do this one way is dp assume each number selection as ...
Proof: Let F−1(n)F−1(n) be the prefix sum of f−1(n)f−1(n) up to nn. The hyperbola formula allows us to compute F−1(n)F−1(n) in O(n−−√)O(n), granted that we already know all values of F(⌊n/k⌋)F(⌊n/k⌋) and F−1(⌊n/k⌋)...
A - Tricky SumCodeForces - 598A In this problem you are to calculate the sum of all integers from 1 ton, but you should take all powers of two with minus in the sum. For example, forn = 4 the sum is equal to - 1 - 2 + 3 - 4 = - 4, be...
Codeforces 964 C. Alternating Sum (求和+逆元) Description You are given two integers a and b. Moreover, you are given a sequence s0,s1,…,sn. All values in s are integers 1 or −1. It’s known that sequence is k-periodic and k divides n+1. In other words, for each k≤i≤...
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1788B-SumOfTwoNumbers.cpp 1788C-MatchingNumbers.cpp 1789A-ServalAndMochasArray.cpp 1789B-ServalAndInversionMagic.cpp 1790A-PolycarpAndTheDayOfPi.cpp 1790B-TaisiaAndDice.cpp 1790C-Premutation.cpp 1790D-Matryoshkas.cpp 1790E-VladAndAPairOfNumbers.cpp 1791A-CodeforcesChecking.cpp 1791B-FollowingDirecti...
All values in ss are integers 11 or −1−1. It's known that sequence is kk-periodic and kk divides n+1n+1. In other words, for each k≤i≤nk≤i≤n it's satisfied that si=si−ksi=si−k. Find out the non-negative remainder of division of n∑i=0sian−ibi∑i=0nsian...
http://codeforces.com/problemset/problem/598/A A. Tricky Sum time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output In this problem you are to calculate the sum of all integers from 1 to n, but you should take all powers of two with...
Your task is to calculate the sum of values over all possiblegood paths. Since this number can be very large, output it modulo109+710^9 + 7109+7. Twogood pathsare considered different if the starting cell differs or there exists an integeri∈[1,k]i \in [1, k]i∈[1,k]such that...
For example let's suppose that the small arrays are {1, 6, -2}, {3, 3} and {-5, 1}. And the indexes in the big array are {2, 3, 1, 3}. So the actual values in the big array after formatting it as concatenation of the small arrays will be {3, 3, -5, 1, 1, 6,...