Submission #391964

#	Time	Username	Problem	Language	Result	Execution time	Memory
391964		kshitij_sodani	Swap (BOI16_swap)	C++14	0 / 100	1 ms	332 KiB

swap

//#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second

llo n;
llo it[200001];
llo ind[200001];
vector<llo> ans;
vector<pair<llo,llo>> kk;
void brute(llo ind){
	if(ind*2>n){
		vector<llo> ss;
		for(llo i=1;i<=n;i++){
			ss.pb(it[i]);
		}
		ans=min(ans,ss);
	}
	else if(ind*2==n){
		llo x=it[ind];
		llo y=it[ind*2];
		
		llo xx=min(x,y);
		if(xx==x){
			brute(ind+1);
		}
		else{
			swap(it[ind],it[ind*2]);
			brute(ind+1);	
		}
		it[ind]=x;
		it[ind*2]=y;
	}
	else{
		llo x=it[ind];
		llo y=it[ind*2];
		llo z=it[ind*2+1];
		llo xx=min(x,y);
		xx=min(xx,z);
		if(xx==x){
			brute(ind+1);
		}
		else if(xx==y){
			swap(it[ind],it[ind*2]);
			brute(ind+1);	
		}
		else{
			//if(x>y){
				kk.pb({y,z});
				swap(it[ind],it[ind*2+1]);
				brute(ind+1);
				it[ind]=x;
				it[ind*2]=y;
				it[ind*2+1]=z;
			//}	
			/*else{
				swap(it[ind],it[ind*2]);
				swap(it[ind],it[ind*2+1]);
				brute(ind+1);
			}*/
		}
		it[ind]=x;
		it[ind*2]=y;
		it[ind*2+1]=z;
	}

}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	for(llo i=0;i<n;i++){
		cin>>it[i+1];
		ans.pb(it[i+1]);
	}
	brute(1);
	vector<llo> ans2=ans;
	for(llo j=0;j<(1<<kk.size());j++){
		vector<llo> cur=ans;
		for(llo i=0;i<n;i++){
			ind[ans[i]]=i;
		}
		for(llo i=0;i<kk.size();i++){
			if((1LL<<i)&j){
				swap(cur[ind[kk[i].a]],cur[ind[kk[i].b]]);
				swap(ind[kk[i].a],ind[kk[i].b]);
			}
			else{
			}
		}
		ans2=min(ans2,cur);
	}	
	/*for(auto j:kk){
		cout<<j.a<<":"<<j.b<<endl;
	}*/
	for(auto j:ans2){
		cout<<j<<" ";
	}
	cout<<endl;
	//cout<<ans<<endl;



 
 
	return 0;
}
 

Compilation message (stderr)

swap.cpp: In function 'int main()':
swap.cpp:87:16: warning: comparison of integer expressions of different signedness: 'llo' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |   for(llo i=0;i<kk.size();i++){
      |               ~^~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 11
• Subtask 3: 0 / 27
• Subtask 4: 0 / 20
• Subtask 5: 0 / 32