CF 1424G - Years

The traceback reveals that the program is not actually failing on the algorithm. It is failing before any meaningful computation starts. The key line is: This means the code is doing: and the first line of the input is: which is clearly not a single integer.

codeforcescompetitive-programmingdata-structuressortings

CF 1424G - Years

Rating: 1300
Tags: data structures, sortings
Solve time: 6m 51s
Verified: no

Solution

The traceback reveals that the program is not actually failing on the algorithm. It is failing before any meaningful computation starts.

The key line is:

ValueError: invalid literal for int() with base 10: '5 6\n'

This means the code is doing:

t = int(input())

and the first line of the input is:

5 6

which is clearly not a single integer.

That tells us the submitted solution is written for a completely different problem format, one that expects a test count t on the first line. The input you provided:

5 6
1 2
2 3
3 4
4 1
1 5
5 1

looks like a graph problem with n = 5, m = 6 and then 6 edges.

So there are two separate issues:

  1. The current code is solving the wrong problem.
  2. Because it expects a test count, it immediately crashes when reading "5 6" as an integer.

I cannot provide a corrected solution yet because the actual problem statement is missing.

The input alone is not enough to determine the intended algorithm. Many different Codeforces graph problems begin with:

n m
u1 v1
u2 v2
...

and the expected answer 8 is not sufficient to uniquely identify which problem it is.

Please provide one of:

  • the Codeforces problem number/name, or
  • the full problem statement, or
  • at least the title of the problem.

Once you provide that, I can trace the algorithmic bug and give a complete corrected Python solution.