Säähavainnot

#include <iostream>
#include <vector>
#include <iomanip>
#include <cmath>

using namespace std;

// Function to calculate the predicted temperature based on previous hours
vector<string> predictTemperatures(const vector<double>& temperatures) {
    vector<string> predictions(12, "?"); // Initialize with "?"
    
    // Calculate predictions for the next 12 hours (hours 12-23)
    for (int hour = 0; hour < 12; ++hour) {
        double sum = 0.0;
        double sum_sq = 0.0;
        int count = 0;

        // Collect data from the previous 12 hours to predict the next hours
        for (int j = hour + 12 - 12; j < hour + 12; ++j) { // Use last 12 hours before prediction
            if (j >= 0 && j < 24) {
                sum += temperatures[j];
                sum_sq += temperatures[j] * temperatures[j];
                count++;
            }
        }

        // Calculate mean and standard deviation
        double mean = (count > 0) ? sum / count : 0.0;
        double stddev = (count > 1) ? sqrt((sum_sq - sum * sum / count) / (count - 1)) : 0.0;

        // Predict the temperature with a simple rule
        if (count > 0) {
            // Use a more refined prediction method
            predictions[hour] = to_string(mean);
            // If the standard deviation is high, output "?"
            if (stddev > 1.0) {
                predictions[hour] = "?";
            }
            predictions[hour].erase(predictions[hour].find('.') + 2); // Keep one decimal
        }
    }

    return predictions;
}

int main() {
    int n; // Number of days
    cin >> n;

    for (int i = 0; i < n; i++) {
        vector<double> temperatures(24);
        for (int j = 0; j < 24; j++) {
            cin >> temperatures[j];
        }

        // Predict the next 12 hours (hours 12–23)
        vector<string> predictions = predictTemperatures(temperatures);

        // Print predictions
        for (int j = 0; j < 12; j++) {
            cout << fixed << setprecision(1) << predictions[j] << " ";
        }
        cout << endl;
    }

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED