Ask AI
Open a hint-first prompt in a new AI chat. Grok may ask you to confirm before sending.
Open Claude Desktopbinary-search · prefix-sums · sorting
The organizer’s problem statement is available at the official source link.
sample trace
Painting Fence Posts: binary search walkthrough
Painting Fence Posts: use the linked editorial?s binary search, prefix sums idea on the published sample, then verify the displayed output.
Published input5 4
3 1
1 5
3 5
1 1
2 1 1 5
1 5 3 4
3 1 3 5
2 1 2 1
3 2 3 3
2 8
1 1
1 2
0 2
0 3
0 0
0 1
2 3
2 0
1 1 2 1
1 0 1 3
1 12
0 0
2 0
2 1
1 1
1 2
3 2
3 3
1 3
1 4
2 4
2 5
0 5
2 2 0 2modelAlgorithm ideaSearch a monotone boundary by repeatedly testing a midpoint with the editorial?s feasibility condition.task resultExpected output1
2
2
1
1
0
0
0
1
1
1
2
1
1
1
1
1
0
0
0
0
0
0
0
- 1
Range
Set the candidate interval for the quantity the task asks to minimize or maximize. - 2
Test
Evaluate the task?s feasibility condition at the midpoint. - 3
Narrow
Keep the half containing the true boundary until the answer is determined. - 4
Verify the sample
Use the published sample output to check the result of this idea on the displayed input.
Tools
1
2
3
4
5
6
7
8
9
10
11
12
Draft saved locally
|12 lines, 156 charsRun output
Run your code to see output.