Säähavainnot

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

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<vector<double>> measurements(n, vector<double>(24));
    vector<vector<double>> predictions(n, vector<double>(12, -1.0));

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

    for (int i = 0; i < n; ++i) {
        for (int hour = 0; hour < 12; ++hour) {
            int count = 0;
            double sum = 0.0;

            for (int day = 0; day < n; ++day) {
                if (measurements[day][hour] != -1.0) {
                    count++;
                    sum += measurements[day][hour];
                }
            }

            if (count > 0) {
                predictions[i][hour] = sum / count;
            }
        }
    }

    for (int i = 0; i < n; ++i) {
        for (int hour = 12; hour < 24; ++hour) {
            if (predictions[i][hour - 12] != -1.0) {
                cout << fixed << setprecision(1) << predictions[i][hour - 12] << " ";
            } else {
                cout << "? ";
            }
        }
        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