Submission #980740

#	Time	Username	Problem	Language	Result	Execution time	Memory
980740		Malix	Permutation (APIO22_perm)	C++17	71.22 / 100	11 ms	1456 KiB

perm

#include "perm.h"
#include <bits/stdc++.h>
using namespace std;

typedef unsigned long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;

#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair

ll INF=1e18+10;

std::vector<int> construct_permutation(long long k)
{
	if(k==1)return {};
	//k--;
	vi ans;
	int pos=-1;
	vector<ll> a(70,INF);
	REP(i,0,64)a[i]=pow(2,i);
	bool flag=1;
	while(k){
		int it=lower_bound(a.begin(),a.end(),k)-a.begin();
		if(a[it]!=k)it--;
		k-=a[it];
		pos+=it;
		int pos2=pos;
		while(it){
			ans.PB(pos);
			pos--;
			it--;
		}
		pos=pos2;
		if(flag){
			REP(i,0,64)a[i]--;
			flag=0;
		}
	}
	reverse(ans.begin(),ans.end());
	//REP(i,0,ans.size())cout<<ans[i]<<" ";
	return ans;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:30:11: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<long long unsigned int>, long long unsigned int>::value_type' {aka 'long long unsigned int'} and 'long long int' [-Wsign-compare]
   30 |   if(a[it]!=k)it--;

• Subtask 1: 10 / 10
• Subtask 2: 61.215384618 / 90