Submission #783329

#	Time	Username	Problem	Language	Result	Execution time	Memory
783329		thimote75	Self Study (JOI22_ho_t2)	C++14	100 / 100	317 ms	11432 KiB

Main

#include <bits/stdc++.h>
#define int long long

using namespace std;

using idata = vector<int>;

int N, M;

idata As, Bs;

int ceilDiv (int x, int y) {
    return (x + y - 1) / y;
}

int solve (int A, int B, int target) {
    if (A < B) A = B;

    if (A * M >= target)
        return M - ceilDiv(target, A);
    
    int local = target - A * M;

    return - ceilDiv(local, B);
}

bool check (int target) {
    int res = 0;
    for (int i = 0; i < N; i ++)  {
        res += solve(As[i], Bs[i], target);
        if (res < - M * N)
            return false;
    }
    
    return res >= 0;
}

signed main () {
    cin >> N >> M;

    if (N < 0) {
        N *= -1;
        int a, b;
        cin >> a >> b;
        As.resize(N, a);
        Bs.resize(N, b);
    } else {
        As.resize(N); Bs.resize(N);
        for (int i = 0; i < N; i ++) cin >> As[i];
        for (int i = 0; i < N; i ++) cin >> Bs[i];
    }

    int a = 0;
    int b = 2e18;
    while (b - a > 1) {
        int c = (a + b) >> 1;

        if (check(c)) a = c;
        else b = c;
    }

    cout << a << endl;
}

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