Submission #1114186

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114186		PieArmy	Permutation (APIO22_perm)	C++17	100 / 100	2 ms	508 KiB

perm

typedef long long ll;
ll pie(ll army){return (1ll<<army);}
#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define endl '\n'
#define mid ((left+right)>>1)
const ll inf=2000000000000000005;
const int sonsuz=2000000005;
using namespace std;
ll fpow(ll x,ll y,ll m=0){if(y<0){cout<<"powError";return -1;}if(m)x%=m;ll res=1;while(y>0){if(y&1)res*=x;x*=x;if(m){x%=m;res%=m;}y>>=1;}return res;}

vector<int> construct_permutation(ll k){
	vector<int>four;
	while(k){
		four.pb(k&3);
		k>>=2;
	}
	reverse(four.begin(),four.end());
	vector<int>res;
	int cnt=0;
	for(int i=0;i<four[0]-1;i++){
		res.pb(-1);
		cnt++;
	}
	for(int i=1;i<four.size();i++){
		if(four[i]==0){
			res.pb(1);
			res.pb(1);
		}
		else if(four[i]==1){
			res.pb(1);
			res.pb(1);
			res.pb(-1);
			cnt++;
		}
		else if(four[i]==2){
			res.pb(1);
			res.pb(-1);
			res.pb(1);
			cnt++;
		}
		else if(cnt>=2){
			res.pb(1);
			res.pb(1);
			res.pb(0);
		}
		else{
			res.pb(1);
			res.pb(-1);
			res.pb(1);
			res.pb(-1);
			cnt+=2;
		}
	}
	vector<int>ans(res.size(),-1);
	int las=int(res.size())-1;
	for(int i=int(res.size())-1;i>=0;i--){
		if(res[i]==1){
			ans[i]=las--;
		}
	}
	if(res.size()){
		las=0;
		vector<int>zero,one;
		for(int i=res.size()-1;i>=0;i--){
			if(res[i]==-1){
				ans[i]=las++;
				for(int x:one){
					ans[x]=las++;
				}
				one=zero;
				zero.clear();
			}
			else if(res[i]==0){
				zero.pb(i);
			}
		}
	}
	return ans;
}
/*
int main(){
	ll n;cin>>n;
	vector<int>ans=construct_permutation(n);
	cout<<ans.size()<<endl;
	for(int x:ans)cout<<x<<" ";
}*/

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(ll)':
perm.cpp:27:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |  for(int i=1;i<four.size();i++){
      |              ~^~~~~~~~~~~~

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