Submission #740917

#	Time	Username	Problem	Language	Result	Execution time	Memory
740917		enerelt14	Permutation (APIO22_perm)	C++17	0 / 100	1 ms	212 KiB

perm

#include "perm.h"
#include<bits/stdc++.h>
#define ll long long
#define pb push_back
using namespace std;
vector<int> x;
int n;
vector<int> construct_permutation(ll k){
	if (k == 1)return {};
	if (k == 2)return {0};
	if (k == 3)return {1, 0};
	if (k % 4 == 0){
		x = construct_permutation(k / 4);
		n = x.size();
		x.pb(n);
		x.pb(n + 1);
		return x;
	}
	if (k % 4 == 1){
		x = construct_permutation(k / 4);
		n = x.size();
		for (int i = 0; i < n; i++)x[i]++;
		x.pb(n + 1);
		x.pb(n + 2);
		x.pb(0);
		return x;
	}
	if (k % 4 == 2){
		x = construct_permutation(k / 4);
		n = x.size();
		for (int i = 0; i < n; i++)x[i]++;
		x.pb(n + 1);
		x.pb(0);
		x.pb(n + 2);
		return x;
	}
	x = construct_permutation(k / 4);
	n = x.size();
	int z, o;
	for (int i = 0; i < n; i++){
		if (x[i] == 0)z = i;
		if (x[i] == 1)o = i;
	}
	if (z > o){
		for (int i = 0; i < n; i++)if (x[i] > 1)x[i]++;
		x.pb(n + 1);
		x.pb(n + 2);
		x.pb(2);
		return x;
	}
	for (int i = 0; i < n; i++)x[i] += 2;
	x.pb(n + 2);
	x.pb(1);
	x.pb(n + 3);
	x.pb(0);
	return x;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:44:2: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized]
   44 |  if (z > o){
      |  ^~
perm.cpp:44:2: warning: 'o' may be used uninitialized in this function [-Wmaybe-uninitialized]

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