Submission #404107

#	Time	Username	Problem	Language	Result	Execution time	Memory
404107		luisgalan	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	59 ms	7108 KiB

molecules

#include<bits/stdc++.h>
#include "molecules.h"
using namespace std;
typedef long long int ll;
#define debug(x) cerr << #x << " = " << (x) << endl

vector<int> find_subset(int l, int u, vector<int> w) {
    int n = w.size();
    vector<pair<int, int>> arr(n);
    for (int i = 0; i < n; i++) {
        arr[i] = { w[i], i };
    }
    sort(arr.begin(), arr.end());
    vector<ll> presum(n+1);
    for (int i = 0; i < n; i++) {
        presum[i + 1] = presum[i] + arr[i].first;
    }
    vector<int> ans;
    for (int k = 1; k <= n; k++) {
        int L = 0;
        int R = n - k + 1;
        while (L < R) {
            int m = (L + R) / 2;
            ll sum = presum[m + k] - presum[m];
            if (sum < l) {
                L = m + 1;
            } else if (sum > u) {
                R = m;
            } else {
                debug(sum);
                for (int j = m; j < m + k; j++) {
                    ans.push_back(arr[j].second);
                }
                break;
            }
        }
        if (!ans.empty()) break;
    }

    return ans;
}

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