Submission #1094562

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094562		stefdasca	Self Study (JOI22_ho_t2)	C++14	100 / 100	129 ms	8024 KiB

Main

// https://stefdasca.ro -> for tutoring
 
#include <iostream>
#include <vector>
 
using namespace std;
 
int solve(long long target, int n, int m, vector<int> &classes, vector<int> &study) {
    long long hours = 1LL * n * m; // how many hours of study i have left
    
    // find out classes for which it's better to go to the courses
    for (int i = 0; i < n; i++) {
        long long required = target;
        if (classes[i] > study[i]) {
            long long needed = required / classes[i];
            if (required % classes[i] > 0) {
                needed++;
            }
            
            if (needed > m) {
                needed = m;
            }
            required = max(0LL, required - needed * classes[i]);
            hours -= needed;
        }
        // subtract comprehension value based on remaining time
        long long needed = required / study[i];
        if (required % study[i] > 0) {
            needed++;
        }
        hours -= needed;
        if (hours < 0) {
            return 0;
        }
    }
    
    return 1;
}
 
int main() {
    
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int n, m;
    cin >> n >> m;
    
    vector <int> classes(n), study(n);
    for (int i = 0; i < n; i++) {
        cin >> classes[i];
    }
    for (int i = 0; i < n; i++) {
        cin >> study[i];
    }
    
    long long L = 0;
    long long R = 1e18;
    long long ans = 0;
    
    while (L <= R) {
        long long mid = (L + R) / 2;
        if (solve(mid, n, m, classes, study)) {
            ans = mid;
            L = mid + 1;
        }
        else {
            R = mid - 1;
        }
    }
    
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29
• Subtask 5: 9 / 9