Submission #974333

#	Time	Username	Problem	Language	Result	Execution time	Memory
974333		IUA_Hasin	Permutation (APIO22_perm)	C++17	10 / 100	4 ms	604 KiB

perm

#include "perm.h"

#include <bits/stdc++.h>

#define endl 								"\n"
#define ll									long long

using namespace std;

ll close_pow(ll n){
	ll a = 1;
	ll b = pow(2, a)-1;
	ll ans = 1;
	while(n>b){
		// cout<<b<<endl;
		ans++;
        b = pow(2, ans)-1;
        if(b>n){
            ans--;
            break;
        } else if(b==n){
            break;
        }
        // cout<<b<<endl;
	}
	return ans;
}


std::vector<int> dunno(ll n){
	std::vector<int> x;
	while(n>0){
		ll a = close_pow(n);
		// cout<<a<<endl;
		x.push_back(a);
		n = n-pow(2,a)+1;
	}
	return x;
}


std::vector<int> construct_permutation(long long k)
{
	std::vector<int> v = dunno(k-1);
	ll sum = 0;
	ll pref[v.size()+1];
	pref[0] = 0;
	for(int i=0; i<v.size(); i++){
		sum = sum+v[i];
		pref[i+1] = pref[i]+v[i];
	}
	std::vector<int> ans;

	ll ins = sum-1;
	ll tempp = 0;
	ll temp = v[tempp];
	ll cnt = 0;
	while(cnt<=sum-1){
		for(int i=1; i<=temp; i++){
			ll a = ins-temp+i;
			ans.push_back(a);
			cnt++;
		}
		ins = ins-temp;
		tempp++;
		temp = v[tempp];
	}

	// for(int i=0; i<ans.size(); i++){
	// 	cout << ans[i] << " ";
	// }
	// cout<<endl;

	return ans;


}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:48:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  for(int i=0; i<v.size(); i++){
      |               ~^~~~~~~~~

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