Submission #658336

#	Time	Username	Problem	Language	Result	Execution time	Memory
658336		Zena_Hossam	Permutation (APIO22_perm)	C++17	10 / 100	1082 ms	852 KiB

perm

#include<bits/stdc++.h>
#include "perm.h"
//#include "grader.cpp"
#define  ll long long
using namespace std;
std::vector<int> construct_permutation(long long k)
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    vector<pair<ll,ll>>v;
    vector<int>s,x;
    long long l=1;
    for(ll i=0;i<100;i++)
    {
        v.push_back({l-1,i});
        l*=2;
        if(l-1>1e18)break;
    }
    ll p=k-2;k--;
    while(1)
    {
        pair<ll,ll>h={k,0};
        ll o=upper_bound(v.begin(),v.end(),h)-v.begin();
        while(v[o].first>k&&k)o--;
        while(k>=v[o].first){
        for(ll i=p-v[o].second+1;i<=p;i++){
            s.push_back(i);
        }
        p-=v[o].second;
        k-=v[o].first;}
        if(k<=0)break;
    }
    for(ll i=0;i<s.size();i++)
    {
        s[i]-=(p+1);
    }
    return s;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:32:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(ll i=0;i<s.size();i++)
      |                ~^~~~~~~~~

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