Submission #577314

#	Time	Username	Problem	Language	Result	Execution time	Memory
577314		handlename	Permutation (APIO22_perm)	C++17	0 / 100	0 ms	212 KiB

perm

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
const int MOD=1e9+7;
long long num[63];
int lol(vector<int> arr){
	int n=arr.size(),res=0;
	for (int i=0;i<(1<<n);i++){
		bool works=true;
		int cur=-1;
		for (int j=0;j<n;j++){
			if (i&(1<<j)){
				if (arr[j]<cur){
					works=false;
					break;
				}
				cur=arr[j];
			}
		}
		if (works) res++;
	}
	return res;
}
vector<int> construct_permutation(long long k){
	num[0]=1;
	for (int i=1;i<63;i++){
		num[i]=num[i-1]*2;
	}
	vector<int> ans;
	for (int whack=0;whack<3;whack++){
		vector<int> arr;
		for (int i=0;i<whack;i++) arr.pb(i);
		do{
			vector<int> res;
			for (auto i:arr) res.pb(i);
			int cur=whack;
			long long tempk=k;
			tempk-=lol(res);
			if (tempk<0) continue;
			while (tempk>0){
				int pos=min((int)res.size(),62);
				while (tempk<num[pos]) pos--;
				res.insert(res.begin()+pos,cur);
				tempk-=num[pos];
				cur++;
			}
			if (ans.empty() || ans.size()>res.size()){
				ans=res;
			}
		} while (next_permutation(arr.begin(),arr.end()));
	}
	return ans;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 90