Submission #435992

#	Time	Username	Problem	Language	Result	Execution time	Memory
435992		qwerasdfzxcl	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	76 ms	10184 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

vector<int> find_subset(int l, int u, vector<int> w) {
    int n = w.size();
    vector<pair<int, int>> a;
    for (int i=0;i<n;i++) a.emplace_back(w[i], i);
    sort(a.begin(), a.end());
    vector<ll> prf, suf;
    prf.push_back(a[0].first); suf.push_back(a[n-1].first);
    for (int i=1;i<n;i++) prf.push_back(prf.back()+a[i].first);
    for (int i=n-2;i>=0;i--) suf.push_back(suf.back()+a[i].first);

    vector<int> ans;
    int idxr = lower_bound(suf.begin(), suf.end(), l) - suf.begin();
    if (idxr<n && suf[idxr]<=u){
        for (int i=0;i<=idxr;i++) ans.push_back(a[n-1-i].second);
        return ans;
    }
    if (idxr==n) return ans;
    for (int i=0;i<n;i++){
        if (prf[i]>u) break;
        if (l<=prf[i] && prf[i]<=u){
            for (int j=0;j<=i;j++) ans.push_back(a[j].second);
            break;
        }
        idxr = lower_bound(suf.begin(), suf.end(), l-prf[i]) - suf.begin();
        if (prf[i]+suf[idxr]<=u){
            for (int j=0;j<=i;j++) ans.push_back(a[j].second);
            for (int j=0;j<=idxr;j++) ans.push_back(a[n-1-j].second);
            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