As we can see the first cell holds only the first value in the array, the second cell hold the sum of the first two values and the third cell holds the first three values and so on... Back to the sum query we ca
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 ...
Your task is to calculate the sum of values over all possible good paths. Since this number can be very large, output it modulo 109+7109+7. Two good paths are considered different if the starting cell differs or there exists an integer i∈[1,k]i∈[1,k] such that the current cell ...
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...
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,...
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...
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The first line of the input contains a single integer nn (1≤n≤2000001≤n≤200000) — the number of number tiles in the bag. The following line contains nn space-separated integers a1,a2,…,ana1,a2,…,an (ai∈{1,2}ai∈{1,2}) — the values written on the tiles. Output Output...
1 ton, but you should take all powers of two with minus in the sum. n = 4 the sum is equal to - 1 - 2 + 3 - 4 = - 4, because 1, 2 and 4 are 20, 21 and 22 tvalues ofn. Input ...
Codeforces 963 A. Alternating Sum (逆元) Description You are given two integers aa and bb. Moreover, you are given a sequence s0,s1,…,sns0,s1,…,sn. All values in ss are integers 11 or −1−1. It’s known that seq...C. Alternating Subsequence C. Alternating Subsequence ...