Submission #953680

#	Time	Username	Problem	Language	Result	Execution time	Memory
953680		De3b0o	Permutation (APIO22_perm)	C++17	10 / 100	14 ms	348 KiB

perm

#include "perm.h"
#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define in insert
#define pb push_back
#define ppb pop_back()
#define d3 ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define cans cout << ans << "\n";
#define yes cout << "Yes" << "\n";
#define no cout << "No" << "\n";
#define pll pair<ll,ll>
#define lin cout << "\n";
#define sqr 340
#define mod 1000000007
#define mid ((l+r)/2)
//#define lc (2*n)
//#define rc (2*n+1)

using namespace std;


ll fp(ll x , ll y)
{
    if(y==0)
        return 1;
    ll z = fp(x,y/2);
    if(y&1)
        return z*z*x;
    else
        return z*z;
}

string tb(ll x)
{
    string s = "";
    while(x>0)
    {
        if(x&1)
            s+='1';
        else
            s+='0';
        x/=2;
    }
    while(s.size()<60)
        s+='0';
    return s;
}

std::vector<int> construct_permutation(long long k)
{
    vector<ll> v;
    for(int sz = 1 ; 90>=sz ; sz++)
    {
        v.clear();
        ll x = k-sz-1;
        string s = tb(x);
        for(int i = 0 ; sz>i ; i++)
        {
            if(s[i]=='1')
                v.pb(i);
            else
                v.pb(0);
        }
        ll y = 0;
        for(int i = 0 ; v.size()>i ; i++)
        {
            y+=fp(2,v[i]);
        }
        if(y==k-1)
            break;
    }
    ll n = v.size();
    vector<int> ans(n,0);
    map<ll,ll> mp;
    for(int i = n-1 ; i>=0 ; i--)
    {
        ll y;
        for(int j = 0 ; n>j ; j++)
        {
            if(mp[j]==1)
                continue;
            ll x = j;
            for(auto it : mp)
            {
                if(it.S==1)
                {
                    if(it.F<j)
                        x--;
                }
            }
            if(x==v[i])
            {
                y=j;
                break;
            }
        }
        ans[i]=y;
        mp[y]=1;
    }
    return ans;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:67:33: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   67 |         for(int i = 0 ; v.size()>i ; i++)
      |                         ~~~~~~~~^~
perm.cpp:99:15: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   99 |         ans[i]=y;

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