Submission #708480

#	Time	Username	Problem	Language	Result	Execution time	Memory
708480		Essa2006	Permutation (APIO22_perm)	C++17	91.33 / 100	5 ms	380 KiB

perm

#include<bits/stdc++.h>
#include "perm.h"
using namespace std;
#define ll long long 
#define endl '\n'
#define FF first
#define SS second
#define aint(a) a.begin(), a.end()
#define mod (int)(1000000007)
ll pw(ll a, ll b){
    ll res=1;
    while(b){
        if(b&1)
            res*=a;
        a*=a, b/=2;
    }
    return res;
}
int gr(ll n){
    ll pr=64;
    ll l=0, r=64;
    while(l<=r){
        ll md=(l+r)/2;
        if(pw(2, md)>n){
            pr=md, r=md-1;
        }
        else
            l=md+1;
    }
    return pr-1;
}
vector<int> construct_permutation(ll k){
    ll j=k;
    k--;
    vector<int>Base, Ans;
    map<int, stack<int>>mp;
    int las=0, cur=0;
    Base.push_back(-1);
    while(k>0){
        int mx=min(gr(k), las);
        k-=pw(2, mx);
        if(mx==las)
            Base.push_back(cur++), las++;
        else
            mp[Base[mx]].push(cur++);
    }
    for(int i=0;i<Base.size();i++){
        if(i)
            Ans.push_back(Base[i]);
        while(!mp[Base[i]].empty()){
            Ans.push_back(mp[Base[i]].top());
            mp[Base[i]].pop();
        }
    }
    return Ans;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     for(int i=0;i<Base.size();i++){
      |                 ~^~~~~~~~~~~~
perm.cpp:33:8: warning: unused variable 'j' [-Wunused-variable]
   33 |     ll j=k;
      |        ^

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