Submission #296052

#	Time	Username	Problem	Language	Result	Execution time	Memory
296052		RealSuperman1	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	517 ms	17376 KiB

molecules

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define fi first
#define se second
#define pll pair<long long, long long>
#define pii pair<int, int>

#include "molecules.h"

using namespace std;

int n;

vector <int> case1234(int l, int u, vector <int> w) {
	vector <bool> dp[2];
	vector <int> take;
	dp[0].assign(u + 1, false);
	dp[1].assign(u + 1, false);
	take.assign(u + 1, -1);
	dp[1][0] = true;
	for (int i = 0; i < w.size(); i++) {
		int md = i % 2;
		for (int j = w[i]; j <= u; j++) {
			if (dp[1 - md][j])
				continue;
			if (dp[1 - md][j - w[i]]) {
				dp[md][j] = true;
				take[j] = i;
			}
		}
		for (int j = 0; j <= u; j++)
			dp[md][j] = (dp[md][j] | dp[1 - md][j]);
	}
	vector <int> ans = {};
	int md = 1 - n % 2;
	for (int i = l; i <= u; i++)
		if (dp[md][i]) {
			int cur = i;
			while (cur != 0) {
				ans.pb(take[cur]);
				cur -= w[take[cur]];
			}
			break;
		}
	
	sort(ans.begin(), ans.end());
	return ans;
}

vector <int> case56(int l, int u, vector <int> w) {
	ll sm = 0;
	vector <pair<ll, int> > x;
	set <int> ans = {};
	for (int i = 0; i < w.size(); i++)
		x.pb({w[i] * 1ll, i});
	sort(x.begin(), x.end());
	bool flag = false;
	int cur = 0;
	for (int i = 0; i < x.size(); i++) {
		if (x[i].fi + sm <= u) {
			sm += x[i].fi;
			ans.insert(x[i].se);
		} else {
			sm += x[i].fi - x[cur].fi;
			ans.erase(x[cur].se);
			ans.insert(x[i].se);
			cur++;
		}
		if (l <= sm) {
			flag = true;
			break;
		}
	}
	if (!flag)
		return {};
	vector <int> anss = {};
	for (set <int>::iterator it = ans.begin(); it != ans.end(); it++)
		anss.pb(*it);
	sort(anss.begin(), anss.end());
	return anss;
}

vector <int> find_subset(int l, int u, vector <int> w) {
	n = w.size();
	int maxw = 0;
	for (int to : w)
		maxw = max(maxw, to);
	if (n <= 10000 && maxw <= 10000 && u <= 10000)
		return case1234(l, u, w);
	return case56(l, u, w);
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> case1234(int, int, std::vector<int>)':
molecules.cpp:22:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for (int i = 0; i < w.size(); i++) {
      |                  ~~^~~~~~~~~~
molecules.cpp: In function 'std::vector<int> case56(int, int, std::vector<int>)':
molecules.cpp:55:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |  for (int i = 0; i < w.size(); i++)
      |                  ~~^~~~~~~~~~
molecules.cpp:60:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |  for (int i = 0; i < x.size(); i++) {
      |                  ~~^~~~~~~~~~

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