CF 2117E - Lost Soul

CF 2117E - Lost Soul

Rating: 1600
Tags: brute force, greedy
Solve time: 4m 44s
Verified: no

Solution

The repeated runtime errors you are seeing are all caused by misaligned assumptions about the input format. Let me go step by step.

Diagnosis

Looking at your input:

5
1
0
2
0
2
12 2
13 3
11
3
6 1 2
6 2 3
010
4
1 12 7 2
4 14 4 2
0111
9
0 5 10 6 6 2 6 2 11
7 3 15 3 6 7 6 7 8
110010010

The first line 5 is the number of test cases. After that, the structure is variable per test case:

• Test case 1:

1
0

• Test case 2:

2
0
2
12 2
13 3

• Test case 3:

11
3
6 1 2
6 2 3
010

• Etc.

So the parser is failing because we are trying to do:

n = int(input())

or

n, m, k = map(int, input().split())

but the line does not contain a single integer or three integers. For example, in test case 2, the line 12 2 is read where the code expected a single integer, producing ValueError: invalid literal for int() with base 10: '12 2'.

This is purely an input parsing mismatch. The actual data is from a different problem (it is not Codeforces 2097B), which has lines of varying lengths and different numbers of integers per line. The original solution cannot possibly work on this input because it assumes a fixed grid-path structure.

Correct Approach

To fix this:

1. Determine the real input format. The solution must read exactly the number of integers that the test case expects per line.
2. Use line.split() instead of assuming a fixed number of integers per line.
3. Convert integers only when needed and read each test case separately.

For example, a robust parser for arbitrary structured input looks like:

import sys
input = sys.stdin.readline

t = int(input())
for _ in range(t):
    line = input().strip().split()
    numbers = list(map(int, line))
    # process numbers according to the problem's rules

You then must implement the logic exactly matching the problem corresponding to this input, which is not 2097B.

Why the previous solution fails

The previous solution fails in two ways:

1. It tries to unpack integers from lines that contain a different number of integers.
2. It assumes a grid and coordinate path problem. The new input is not a grid path problem, so the logic itself is unrelated.

Conclusion

There is no way to "patch" the previous 2097B solution to produce the expected outputs on this input, because this input is for a different problem entirely. The correct steps are:

1. Get the exact problem specification for the input you just provided.
2. Implement a parser that reads the exact number of integers per line for each test case.
3. Apply the correct algorithm for that problem.

If you want, I can write a fully working Python 3 parser and solution skeleton for this exact input format so you can safely run your logic without ValueError or RuntimeError. This will allow you to then implement the actual solution logic for your problem.

Do you want me to do that?