Submission #1003478

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003478		mispertion	Permutation (APIO22_perm)	C++17	91.33 / 100	391 ms	596 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define sz(x) (int)x.size()
#define pb(x) push_back(x)

ll calcperm(vector<int> a){
    vector<ll> dp(sz(a));
    ll ans = 1;
    for(int i = 0; i < sz(a); i++){
        dp[i] = 1;
        for(int j = i - 1; j >= 0; j--){
            if(a[i] > a[j])
                dp[i] += dp[j];
        }
        ans = ans + dp[i];
    }
    return ans;
}

vector<int> construct_permutation(long long k){
    vector<int> ans = {};
    ll cur = 0;
    while(cur < k){
        ans.insert(ans.begin(), sz(ans));
        int rem = 0;
        for(; rem < sz(ans); rem++){
            vector<int> ch = {};
            ch.pb(sz(ans) - rem - 1);
            for(int i = 1; i < sz(ans); i++){
                if(ans[i] >= sz(ans) - rem - 1)
                    ch.pb(ans[i] + 1);
                else
                    ch.pb(ans[i]);
            }
            if(calcperm(ch) > k)
                break;
        }
        rem--;
        ans[0] -= rem;
        for(int i = 1; i < sz(ans); i++)
            if(ans[i] >= ans[0])
                ans[i]++;
        cur = calcperm(ans);
    }
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 81.333333333 / 90