Submission #578358

#	Time	Username	Problem	Language	Result	Execution time	Memory
578358		islingr	Detecting Molecules (IOI16_molecules)	C++17	100 / 100	77 ms	2644 KiB

molecules

#include "molecules.h"

#include <algorithm>
#include <cassert>
#include <numeric>

using i64 = int64_t;

std::vector<int> find_subset(int l, int u, std::vector<int> w) {
    int n = w.size();

    std::vector<int> ord(n);
    std::iota(ord.begin(), ord.end(), 0);
    std::sort(ord.begin(), ord.end(), [&](int x, int y) { return w[x] < w[y]; });
    std::sort(w.begin(), w.end());

    int k = 1;
    for (i64 mn = 0, mx = 0; k <= n; ++k) {
        mn += w[k - 1];
        mx += w[n - k];
        if (l <= mx && mn <= u) break;
    }
    if (k > n) return {};

    auto cur = std::accumulate(w.begin(), w.begin() + k, i64(0));
    for (int i = 0; i <= n - k; ++i) {
        if (l <= cur && cur <= u) return {ord.begin() + i, ord.begin() + i + k};
        cur -= w[i];
        cur += w[i + k];
    }
    assert(false);
    return {};
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 23 / 23
• Subtask 6: 31 / 31