Submission #958212

#TimeUsernameProblemLanguageResultExecution timeMemory
958212pragmatistPermutation (APIO22_perm)C++17
98.67 / 100
53 ms600 KiB
#include "perm.h"
#include<bits/stdc++.h>
 
using namespace std;
 
mt19937 rng(time(NULL));
 
long long dp[120], a[120];
int mn;
vector<int> ans;

void go(long long k, int p[]) {
	for(int i = 1; i <= 3; ++i) {
		a[i] = p[i-1];
	}
	int n = 3;
	long long cur = 1;
	for(int i = 1; i <= 3; ++i) {
		dp[i] = 1;
		for(int j = 1; j < i; ++j) {
			if(a[j]<a[i]) {
				dp[i] += dp[j];
			}
		}
		cur += dp[i];
	}
	while(cur<k) {
		vector<pair<int, long long> > b;
		for(int i = 1; i <= n; ++i) {
			b.push_back({a[i], dp[i]});
		}
		sort(b.begin(), b.end());
		long long add = 1, need = k-cur;
		int nxt = 0;
		for(auto [x, y] : b) {
			if(add+y<=need) {
				nxt = x+1;
				add += y;								
			}
		}
		for(int i = 0; i <= n; ++i) {
			if(a[i] >= nxt) {
				a[i]++;
			}
		}			
		a[++n] = nxt;
		dp[n] = add;
		cur += add;
	}
	vector<int> res;
	for(int i = 1; i <= n; ++i) {
		res.push_back(a[i]);
	}
	if(n<mn) {
		mn = n;
		ans = res;
	}
}

std::vector<int> construct_permutation(long long k) {
	if(k <= 7) {
		vector<int> ans(k-1);
		for(int i = 0; i < k-1; ++i) {
			ans[i]=k-i-2;
		}
		return ans;
	}
	mn = 1e9;    
	int p[] = {0, 1, 2};
	do {
		go(k, p);	
	} while(next_permutation(p, p+3));
    return ans;
}
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