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#include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<int> arr(n); for (int i = 0; i < n; ++i) { cin >> arr[i]; } int k; cin >> k; bool all_positive = true; for (int x : arr) { if (x < 0) { all_positive = false; break; } } if (all_positive) { cout << endl; return 0; } vector<int> steps; vector<int> tmp = arr; for (int i = 0; i < n - 1; ++i) { if (tmp[i] < 0) { tmp[i] *= -1; tmp[i + 1] *= -1; steps.push_back(i + 1); // Convert to 1-based index } } if (tmp.back() < 0) { tmp.back() *= -1; steps.push_back(n); } if (steps.size() > k) { cout << -1 << endl; } else { for (size_t i = 0; i < steps.size(); ++i) { if (i > 0) cout << " "; cout << steps[i]; } cout << endl; } return 0; }

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#include <iostream> #include <vector> using namespace std; int main() { int sender_size, receiver_size; cin >> sender_size; vector<int> senders(sender_size); for (int i = 0; i < sender_size; ++i) { cin >> senders[i]; } // Read receiver antennas cin >> receiver_size; vector<int> receivers(receiver_size); for (int i = 0; i < receiver_size; ++i) { cin >> receivers[i]; } int n = sender_size; int m = receiver_size; vector<vector<int>> dp(n + 1, vector<int>(m + 1, 0)); for (int i = 1; i <= n; ++i) { for (int j = 1; j <= m; ++j) { if (senders[i-1] == receivers[j-1]) { dp[i][j] = dp[i-1][j-1] + 1; } else { dp[i][j] = max(dp[i-1][j], dp[i][j-1]); } } } cout << dp[n][m] << endl; return 0; }

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#include <iostream> #include <vector> using namespace std; int main() { int n; cin >> n; vector<int> arr(n); for (int i = 0; i < n; ++i) { cin >> arr[i]; } int k; cin >> k; bool all_positive = true; for (int x : arr) { if (x < 0) { all_positive = false; break; } } if (all_positive) { cout << endl; return 0; } vector<int> steps; vector<int> tmp = arr; for (int i = 0; i < n - 1; ++i) { if (tmp[i] < 0) { tmp[i] *= -1; tmp[i + 1] *= -1; steps.push_back(i + 1); // Convert to 1-based index } } if (tmp.back() < 0) { tmp.back() *= -1; steps.push_back(n); } if (steps.size() > k) { cout << -1 << endl; } else { for (size_t i = 0; i < steps.size(); ++i) { if (i > 0) cout << " "; cout << steps[i]; } cout << endl; } return 0; }

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