Submission #433451

#	Time	Username	Problem	Language	Result	Execution time	Memory
433451		MilosMilutinovic	Divide and conquer (IZhO14_divide)	C++14	17 / 100	1 ms	260 KiB

divide

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;
    vector<int> X(N), G(N), D(N);

    for (int i = 0; i < N; i++)
        cin >> X[i] >> G[i] >> D[i];

    vector<int64_t> pref_gold(N);
    for (int i = 0; i < N; i++)
        pref_gold[i] = G[i] + (i > 0 ? pref_gold[i - 1] : 0);

    vector<int64_t> pref_energy(N);
    for (int i = 0; i < N; i++)
        pref_energy[i] = D[i] + (i > 0 ? pref_energy[i - 1] : 0);

    auto Check = [&](long long val) -> bool {
        for (int i = 0; i < N; i++) {
            int bot = i, top = N - 1, pos = N;
            while (bot <= top) {
                int mid = (bot + top) / 2;
                if (pref_gold[mid] - (i == 0 ? 0 : pref_gold[i - 1]) >= val)
                    pos = mid, top = mid - 1;
                else
                    bot = mid + 1;
            }

            if (pos == N)
                continue;

            if (pref_energy[pos] - (i == 0 ? 0 : pref_energy[i - 1]) >= X[pos] - X[i])
                return true;
        }

        return false;
    };

    int64_t bot = 0, top = 1e18, ans = 0;
    while (bot <= top) {
        int64_t mid = (bot + top) / 2;
        if (Check(mid))
            ans = mid, bot = mid + 1;
        else
            top = mid - 1;
    }

    cout << ans << "\n";
}

• Subtask 1: 17 / 17
• Subtask 2: 0 / 31
• Subtask 3: 0 / 52