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Submission #433454

# Submission time Handle Problem Language Result Execution time Memory
433454 2021-06-19T20:29:53 Z MilosMilutinovic Divide and conquer (IZhO14_divide) C++14
0 / 100
 1 ms 204 KB 
#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 = accumulate(G.begin(), G.end(), 0), 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
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Incorrect 1 ms 204 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Incorrect 1 ms 204 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Incorrect 1 ms 204 KB Output isn't correct
7 Halted 0 ms 0 KB -