Submission #241704

#	Time	Username	Problem	Language	Result	Execution time	Memory
241704		godwind	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	76 ms	6252 KiB

molecules

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <cstring>
#include <cmath>
#include <functional>
#include "molecules.h"

using namespace std;

#define left left228
#define right right228
#define all(v) v.begin(), v.end()

vector<int> find_subset(int l, int u, vector<int> w) {
	int n = (int)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());
	long long left = 0, right = 0;
	for (int k = 1; k <= n; ++k) {
		left += a[k - 1].first;
		right += a[n - k].first;
		if (l <= left && left <= u) {
			vector<int> answer;
			for (int i = 0; i < k; ++i) {
				answer.emplace_back(a[i].second);
			}
			sort(all(answer));
			return answer;
		}
		if (l <= right && right <= u) {
			vector<int> answer;
			for (int i = n - 1; i > n - 1 - k; --i) {
				answer.emplace_back(a[i].second);
			}
			sort(all(answer));
			return answer;
		}
		if (left < l && right > u) {
			vector<int> answer;
			for (int i = 0; i < k; ++i) {
				answer.emplace_back(a[i].second);
			}
			vector<int> ind;
			for (int i = n - 1; i > n - 1 - k; --i) {
				ind.emplace_back(a[i].second);
			}
			for (int i = 0; i < k; ++i) {
				left -= w[ answer[i] ];
				left += w[ ind[i] ];
				answer[i] = ind[i];
				if (l <= left && left <= u) {
					break;
				}
			}
			return answer;
		}
	}
	return vector<int>(0);
}

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