Submission #428588

#	Time	Username	Problem	Language	Result	Execution time	Memory
428588		dreezy	Detecting Molecules (IOI16_molecules)	C++17	10 / 100	1 ms	292 KiB

molecules

#include <bits/stdc++.h>
#include "molecules.h"
using namespace std;
#define pb push_back
#define pi pair<int,int>
#define ll long long
#define mp make_pair


vector<pi> sorted;


pair<ll, pair<int,int>> eval(int k, int l, int u){	
	int n = sorted.size();
	ll curans = 0;
	int left = 0;
	int right = left + k;
	
	for(int i =left; i <= right; i++)
		curans+=sorted[i].first;
	if(curans >=l and curans <= u){
		
		return {curans, {left, right}};
	}
	if(curans > u){
		return {curans, {left, right}};
	}
	
	
	while(curans <l){
		if(left >=n)
			return {curans, {left, right}};
		curans -= sorted[left].first;
		left++;
		right++;
		if(right >= n)
			return {curans, {left, right}};
		curans += sorted[right].first;
		if(curans >= l and curans <= u)
			return {curans, {left, right}};
		else if(curans >= u )
			return {curans, {left, right}};
	}
	
	return {curans, {left, right}};
}
vector<int> find_subset(int l, int u, vector<int> w) {
	
	
	int n = w.size();
	sorted.resize(n);
	for(int i =0;i<n ; i++)
		sorted[i] = {w[i], i};
	sort(sorted.begin(), sorted.end());
	
	int lpntr = -1, rpntr = -1;
	int leftk = 1;
	int rightk = n ;

	
	while(leftk <= rightk){
		int mid = (leftk + rightk) /2;
		pair<ll, pair<int,int>> res = eval(mid, l, u);
		
		if(res.first < l){
			leftk = mid + 1;
		}
		else if( res.first > u){
			rightk = mid -1;
		}
		else{
			lpntr = res.second.first;
			rpntr = res.second.second;
			break;
		}
		
	}

	if(lpntr == -1 and rpntr == -1)
		return vector<int> ();
		
	vector<int> ans;
	for(int i = max(0,lpntr); i<= rpntr; i++)
		ans.pb(sorted[i].second);
	sort(ans.begin(), ans.end());
	return ans;
}


/***************/

• Subtask 1: 0 / 9
• Subtask 2: 10 / 10
• Subtask 3: 0 / 12
• Subtask 4: 0 / 15
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31