Snakeless path

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdint>
#include <stack>
#include <functional>

std::vector<int> find_path(int start, int end, std::vector<std::vector<bool>> &snakes) {
    std::vector<bool> visited(end+1, false);

    std::function<std::vector<int>(int, int)> recurse = [&snakes, &visited, &recurse](int start, int end) -> std::vector<int> {
        if (start == end) return {end};
        
        visited[start] = true;
        std::vector<int> path;
        path.push_back(start);
        //std::cout << "Adding " << start+1 << std::endl;
        for (int i = 0; i <= end; ++i) {
            if (visited[i]) continue;
            if (snakes[start][i]) continue;
            
            //std::cout << "Checking edge " << start+1 << " " << edge+1 << std::endl;
            std::vector<int> rescursed_path = recurse(i, end);
            if (rescursed_path.size() > 0) {
                path.insert(path.end(), rescursed_path.begin(), rescursed_path.end());
                break;
            }
            //std::cout << "No valid path with " << edge+1 << std::endl;
        }

        if (path.size() == 1) {
            //std::cout << "Removing " << start+1 << std::endl;
            visited[start] = false;
            return {};
        };
        //std::cout << "Found path" << std::endl;
        return path;
    };

    return recurse(start, end);
}

int main() {
    int n, m;
    std::cin >> n >> m;

    std::vector<std::vector<bool>> snakes(n, std::vector<bool>(n, false));
    for (int i = 0; i < m; ++i) {
        int a, b;
        std::cin >> a >> b;
        snakes[a-1][b-1] = true;
        snakes[b-1][a-1] = true;
    }

    std::vector<int> path = find_path(0, n-1, snakes);

    std::cout << path.size() << std::endl;
    for (auto &node : path) {
        std::cout << node+1 << " ";
    }
    std::cout << std::endl;
}

Test 1

Verdict: ACCEPTED

Test 2

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Test 3

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Test 4

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Test 5

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Test 6

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Test 7

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Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

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Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

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Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

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Test 30

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

Test 46

Verdict: ACCEPTED

Test 47

Verdict: ACCEPTED

Test 48

Verdict: ACCEPTED

Test 49

Verdict: ACCEPTED

Test 50

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Test 65

Verdict: ACCEPTED

Test 66

Verdict: ACCEPTED

Test 67

Verdict: ACCEPTED

Test 68

Verdict: ACCEPTED

Test 69

Verdict: ACCEPTED

Test 70

Verdict: RUNTIME ERROR

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Verdict: RUNTIME ERROR

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Verdict: RUNTIME ERROR

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Test 87

Verdict: RUNTIME ERROR

Test 88

Verdict: RUNTIME ERROR

Test 89

Verdict: RUNTIME ERROR