Submission #800328

#	Time	Username	Problem	Language	Result	Execution time	Memory
800328		LIF	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	39 ms	10288 KiB

molecules

#include "molecules.h"
#include<bits/stdc++.h>
//some tricks :
//if we want to check if the sum of set can reach : [l,r], we can find it maxn, it minn , 
//sometimes it will useful , but sometimes not.
//in this cases : it is useful since the max element of the set subtract the min element of the set is less than r-l, so it will not skip the range. 
using namespace std;
pair<long long int,int> a[300005];
long long int suf[300005];
long long int pre[300005];
std::vector<int> find_subset(int l, int u, std::vector<int> w) {
    for(int i=0;i<w.size();i++)
    {
    	a[i+1].first = w[i];
    	a[i+1].second = i;
	}
	sort(a+1,a+w.size()+1);
    int n = w.size();
    for(int i=1;i<=n;i++)pre[i] = pre[i-1] + a[i].first;
    for(int i=n;i>=1;i--)suf[i] = suf[i+1] + a[i].first;
    bool flag = false;
    int k = 0;
    for(int i=1;i<=n;i++)
    {
    	if(pre[i] <= u && suf[n-i+1] >= l)
    	{
    		k = i;
    		flag = true;
		}
	}
	vector<int> ans;
	if(flag == false)return ans;
	for(int i=k;i<=n;i++)
	{
		if(pre[i] - pre[i-k] >= l && pre[i] - pre[i-k] <= u)
		{
			for(int j=i-k+1;j<=i;j++)ans.push_back(a[j].second);
			break;
		}
	}
	return ans;
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int i=0;i<w.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