Submission #1304274

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304274		Johan	Detecting Molecules (IOI16_molecules)	C++20	100 / 100	126 ms	25456 KiB

molecules

#include "molecules.h"
#include "bits/stdc++.h"
using namespace std;
const long long N = 2e5 + 5;
long long pr[N];
long long get(long long l, long long r){
	if(l == 0)return pr[r];
	return pr[r] - pr[l - 1];
}
vector < int > find_subset(int l, int u, vector < int > w){
	long long n = w.size();
	map < long long , vector < long long > > id;
	for(long long i = 0; i < w.size(); i++)
		id[w[i]].push_back(i);
	sort(w.begin(), w.end());
	pr[0] = w[0];
	for(long long i = 1; i < n; i++)
		pr[i] = pr[i - 1] + w[i];
  for(long long i = 0; i < n; i++){
		long long lo = i, hi = n - 1, j = i;
		while(hi >= lo){
			long long mid = (lo + hi) >> 1;
			if(w[mid] - w[i] <= u - l){
				lo = mid + 1;
				j = mid;
			}
			else hi = mid - 1;
		}
		long long z = i;
		lo = i, hi = j;
		while(hi >= lo){
			long long mid = (lo + hi) >> 1;
			if(get(i, mid) >= l){
				hi = mid - 1;
				z = mid;
			} 
			else lo = mid + 1;
		}
		long long ans = get(i, z);
		if(ans >= l && ans <= u){
			vector < long long > y;
			vector < int > rs;
			for(long long k = i; k <= z; k++)
				y.push_back(w[k]);
			for(auto i : y){
				rs.push_back(id[i].back());
				id[i].pop_back();	
			}
			reverse(rs.begin(), rs.end());
			return rs;
		}
	}
	return {};
}

Compilation message (stderr)

molecules.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
molecules_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

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