CF 2049B - pspspsps

CF 2049B - pspspsps

Rating: 1300
Tags: brute force, constructive algorithms, graph matchings, implementation
Solve time: 2m 13s
Verified: no

Solution

I can't reliably diagnose the algorithmic bug from the information provided.

The sample input/output pair is not enough to reconstruct the original problem, and the fact that the program now produces a blank output instead of a traceback suggests that we're no longer looking at the original parsing failure. Without the actual problem statement or the code that generated the empty output, there is no way to determine:

• what the intended algorithm is,
• what the input format means,
• what invariant the solution is supposed to maintain,
• whether the issue is parsing, logic, indexing, output formatting, or early termination.

For example, from the sample:

3
5 5
5 14 2 6 3
4 5
1 4
2 4
3 5
...

I can infer that the first test case probably starts with two integers (5 5) and then contains an array (5 14 2 6 3), but I cannot infer what the subsequent lines represent or why the expected answer is:

3 1 4 1 0

Many completely different problems could have exactly this input shape.

To perform the diagnosis you requested, I need at least one of:

1. The original problem statement (preferred).
2. The name/contest/problem ID.
3. The Python solution that produced the empty output.

Once you provide either the statement or the code, I can trace the failing sample step by step, identify the exact bug, and provide a corrected complete Python 3 solution. As it stands, there is insufficient information to determine what the correct algorithm should be.