All Questions
6 questions
2
votes
5
answers
315
views
Sum of bitwise XOR of each subarray weighted by length
here is the problem statement
You are given an array a of length n consisting of non-negative integers.
You have to calculate the value of \$\sum_{l=1}^n \sum_{r=l}^n f(l,r)\cdot (r - l + 1)\$ where \...
5
votes
3
answers
320
views
Largest contiguous sub-array sum
Challenge
Determine the largest contiguous sum of integers in a list.
Specifications
The first argument is a path to a file.
The file contains multiple lines.
Each line is a test case represented by ...
- 9,919
8
votes
2
answers
2k
views
Counting Increasing Subsequences of size K recursive
The original description of the problem can be found here, its input here and its expected output here.
The problem:
Given a integer sequence a1 ... an (-10000
\$\leq\$ ai \$\leq\$ 10000). Where ...
user70000
6
votes
1
answer
121
views
Optimal way to annihilate a list by removing items from the ends
I'm stuck with a contest problem.
Description:
What is the minimum number of moves to annihilate an int array where the possible moves are:
Remove both the first and last elements if they are equal ...
- 63
4
votes
1
answer
242
views
NGON (many polygons) on SPOJ
I am trying to solve NGON problem. I am using bottom up dynamic programming here. Recurrence function is:
$$\begin{array}{rl}
f(a,b) &= f(a-1,b) + f(a-1,b-1)\,a_i +\frac{f(a-1,b-2)\,a_i(a_i-1)...
- 183
4
votes
2
answers
5k
views
Project Euler #15 -- count possible lattice paths
I'm not a C programmer, just wanted to make a fast solution to the problem.
Starting in the top left corner of a 2×2 grid, and only being able to move to the right and down, there are exactly 6 ...
- 626