Submission #915206

#	Time	Username	Problem	Language	Result	Execution time	Memory
915206		a_l_i_r_e_z_a	Permutation (APIO22_perm)	C++17	0 / 100	3 ms	604 KiB

perm

// In the name of God
// Hope is last to die

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

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

#define pb push_back
#define S second
#define F first
#define mp make_pair
#define smax(x, y) (x) = max((x), (y))
#define smin(x, y) (x) = min((x), (y))
#define all(x) (x).begin(), (x).end()
#define len(x) ((int)(x).size())

const int maxn = 200 + 5; 
const int inf = 1e9 + 7;

vector<int> construct_permutation(ll k){
    vector<int> vec;
    if(k == 1) return vec;
    if(k == 2){
        vec.pb(0);
        return vec;
    }
    if(k == 3){
        vec.pb(1);
        vec.pb(0);
        return vec;
    }
    ll r = k % 4;
    vec = construct_permutation(k / 4);
    int n = len(vec);
    if(r == 0){
        vec.pb(n);
        vec.pb(n + 1);
    }
    else if(r == 1){
        for(auto &u: vec) u++;
        vec.pb(n + 1);
        vec.pb(n + 2);
        vec.pb(0);
    }
    else if(r == 2){
        for(auto &u: vec) u++;
        vec.pb(n + 1);
        vec.pb(0);
        vec.pb(n + 2);
    }
    else{
        bool flag;
        for(auto u: vec) if(u < 2){
            flag = u; 
            break;
        }
        if(flag){
            for(auto &u: vec) if(u > 1) u++;
            vec.pb(n + 1);
            vec.pb(n + 2);
            vec.pb(2);
        }
        else{
            for(auto &u: vec) u += 2;
            vec.pb(n + 2);
            vec.pb(1);
            vec.pb(n + 3);
            vec.pb(0);
        }
    }
}

// int32_t main()
// {
//     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//     return 0;
// }

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(ll)':
perm.cpp:75:1: warning: control reaches end of non-void function [-Wreturn-type]
   75 | }
      | ^
perm.cpp:61:9: warning: 'flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
   61 |         if(flag){
      |         ^~

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