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답안 #1105014

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1105014 2024-10-25T07:43:06 Z alexander707070 고대 책들 (IOI17_books) C++14
50 / 100
 125 ms 28744 KB 
#include<bits/stdc++.h>
#define MAXN 1000007
using namespace std;

int n,s,p[MAXN],fr,last,mins,maxs,pref[MAXN],curr;
bool li[MAXN];
long long ans;

int k,cycle[MAXN];
pair<int,int> where[MAXN];

void dfs(int x){
	li[x]=true;
	cycle[x]=k;

	ans+=abs(x-p[x]);
	mins=min(mins,x);
	maxs=max(maxs,x);

	if(!li[p[x]])dfs(p[x]);
}

long long minimum_walk(vector<int> P, int S){
	n=int(P.size()); s=S+1;

	for(int i=1;i<=n;i++){
		p[i]=P[i-1]+1;
		li[i]=false; pref[i]=0;
	}
	last=0; fr=n+1; k=0; ans=0;

	for(int i=1;i<=n;i++){
		if(!li[i]){
			if(p[i]!=i)last=i;
			dfs(i);
		}
	}

	for(int i=1;i<=n;i++)li[i]=false;

	for(int i=n;i>=1;i--){
		if(!li[i]){
			k++;
			if(p[i]!=i)fr=i;

			mins=n; maxs=1;
			dfs(i);

			where[k]={mins,maxs};
			pref[mins]++; pref[maxs]--;
		}
	}
	ans/=2;

	for(int i=1;i<=n-1;i++){
		curr+=pref[i];
		if(i<s)continue;

		if(curr==0 and last>i)ans+=2;
	}

	curr=0;
	for(int i=n;i>=2;i--){
		curr+=pref[i];
		if(i>s)continue;

		if(curr==0 and fr<i)ans+=2;
	}

	/// more steps inside initial cycle

	vector<int> l={0},r={0};
	int from=s,to=s,ll=s,rr=s;
	
	while(true){
		while(ll>=from){
			if(where[cycle[ll]].second>=s and l.back()>0){
				l.push_back(0);
			}

			from=min(from,where[cycle[ll]].first);
			to=max(to,where[cycle[ll]].second);
			ll--;
		}

		while(rr<=to){
			if(where[cycle[rr]].first<=s and r.back()>0){
				r.push_back(0);
			}

			from=min(from,where[cycle[rr]].first);
			to=max(to,where[cycle[rr]].second);
			rr++;
		}

		if(ll<from and rr>to){
			if(from==1 or to==n)break;

			if(where[cycle[ll]].second>=s and where[cycle[rr]].first<=s){
				l[l.size()-1]++; r[r.size()-1]++;
				l.push_back(0); r.push_back(0);
				from--; to++;
			}else if(where[cycle[ll]].second>=s){
				r[r.size()-1]++; to++;
			}else{
				l[l.size()-1]++; from--;
			}
		}
	}

	assert(l.size()==r.size());

	for(int i=0;i<l.size();i++){
		ans+=2*min(l[i],r[i]);
	}
	
	return ans;
}

/*int main(){

	cout<<minimum_walk({12,1,9,3,7,5,6,4,8,2,11,10,0},6)<<"\n";

	vector<int> perm;
	for(int i=0;i<20;i++){
		perm.push_back(i);
	}

	while(true){
		random_shuffle(perm.begin(),perm.end());
		for(int i=0;i<20;i++){
			cout<<perm[i]<<" ";
		}
		cout<<"\n";

		int z=rand()%20;

		cout<<z<<"\n";
		minimum_walk(perm,z);
	}

	return 0;
}*/

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:113:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |  for(int i=0;i<l.size();i++){
      |              ~^~~~~~~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8528 KB Output is correct
2 Correct 1 ms 8528 KB Output is correct
3 Correct 1 ms 8528 KB Output is correct
4 Correct 1 ms 8528 KB Output is correct
5 Correct 1 ms 8528 KB Output is correct
6 Correct 1 ms 8528 KB Output is correct
7 Correct 2 ms 8528 KB Output is correct
8 Correct 2 ms 8528 KB Output is correct
9 Correct 2 ms 8528 KB Output is correct
10 Correct 2 ms 8528 KB Output is correct
11 Correct 2 ms 8528 KB Output is correct
12 Correct 1 ms 8528 KB Output is correct
13 Correct 2 ms 8528 KB Output is correct
14 Correct 2 ms 8528 KB Output is correct
15 Correct 1 ms 8528 KB Output is correct
16 Correct 2 ms 8528 KB Output is correct
17 Correct 2 ms 8528 KB Output is correct
18 Correct 1 ms 8528 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8528 KB Output is correct
2 Correct 1 ms 8528 KB Output is correct
3 Correct 1 ms 8528 KB Output is correct
4 Correct 1 ms 8528 KB Output is correct
5 Correct 1 ms 8528 KB Output is correct
6 Correct 1 ms 8528 KB Output is correct
7 Correct 2 ms 8528 KB Output is correct
8 Correct 2 ms 8528 KB Output is correct
9 Correct 2 ms 8528 KB Output is correct
10 Correct 2 ms 8528 KB Output is correct
11 Correct 2 ms 8528 KB Output is correct
12 Correct 1 ms 8528 KB Output is correct
13 Correct 2 ms 8528 KB Output is correct
14 Correct 2 ms 8528 KB Output is correct
15 Correct 1 ms 8528 KB Output is correct
16 Correct 2 ms 8528 KB Output is correct
17 Correct 2 ms 8528 KB Output is correct
18 Correct 1 ms 8528 KB Output is correct
19 Correct 2 ms 8528 KB Output is correct
20 Correct 1 ms 8528 KB Output is correct
21 Correct 1 ms 8528 KB Output is correct
22 Correct 1 ms 8528 KB Output is correct
23 Correct 1 ms 8528 KB Output is correct
24 Correct 1 ms 8528 KB Output is correct
25 Correct 1 ms 8696 KB Output is correct
26 Correct 2 ms 8528 KB Output is correct
27 Correct 2 ms 8696 KB Output is correct
28 Correct 2 ms 8528 KB Output is correct
29 Correct 2 ms 8528 KB Output is correct

Subtask #3
28.0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8528 KB Output is correct
2 Correct 1 ms 8528 KB Output is correct
3 Correct 1 ms 8528 KB Output is correct
4 Correct 1 ms 8528 KB Output is correct
5 Correct 1 ms 8528 KB Output is correct
6 Correct 1 ms 8528 KB Output is correct
7 Correct 2 ms 8528 KB Output is correct
8 Correct 2 ms 8528 KB Output is correct
9 Correct 2 ms 8528 KB Output is correct
10 Correct 2 ms 8528 KB Output is correct
11 Correct 2 ms 8528 KB Output is correct
12 Correct 1 ms 8528 KB Output is correct
13 Correct 2 ms 8528 KB Output is correct
14 Correct 2 ms 8528 KB Output is correct
15 Correct 1 ms 8528 KB Output is correct
16 Correct 2 ms 8528 KB Output is correct
17 Correct 2 ms 8528 KB Output is correct
18 Correct 1 ms 8528 KB Output is correct
19 Correct 2 ms 8528 KB Output is correct
20 Correct 1 ms 8528 KB Output is correct
21 Correct 1 ms 8528 KB Output is correct
22 Correct 1 ms 8528 KB Output is correct
23 Correct 1 ms 8528 KB Output is correct
24 Correct 1 ms 8528 KB Output is correct
25 Correct 1 ms 8696 KB Output is correct
26 Correct 2 ms 8528 KB Output is correct
27 Correct 2 ms 8696 KB Output is correct
28 Correct 2 ms 8528 KB Output is correct
29 Correct 2 ms 8528 KB Output is correct
30 Correct 125 ms 22348 KB Output is correct
31 Correct 121 ms 22272 KB Output is correct
32 Correct 86 ms 28668 KB Output is correct
33 Correct 95 ms 28744 KB Output is correct
34 Correct 102 ms 28668 KB Output is correct
35 Correct 93 ms 28744 KB Output is correct
36 Correct 90 ms 24596 KB Output is correct
37 Correct 84 ms 24648 KB Output is correct
38 Correct 77 ms 22268 KB Output is correct
39 Correct 91 ms 22268 KB Output is correct
40 Correct 101 ms 22268 KB Output is correct
41 Correct 104 ms 22344 KB Output is correct
42 Correct 98 ms 22344 KB Output is correct
43 Correct 83 ms 28668 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8700 KB Output is correct
2 Correct 1 ms 8528 KB Output is correct
3 Runtime error 12 ms 17232 KB Execution killed with signal 6
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 8528 KB Output is correct
2 Correct 1 ms 8528 KB Output is correct
3 Correct 1 ms 8528 KB Output is correct
4 Correct 1 ms 8528 KB Output is correct
5 Correct 1 ms 8528 KB Output is correct
6 Correct 1 ms 8528 KB Output is correct
7 Correct 2 ms 8528 KB Output is correct
8 Correct 2 ms 8528 KB Output is correct
9 Correct 2 ms 8528 KB Output is correct
10 Correct 2 ms 8528 KB Output is correct
11 Correct 2 ms 8528 KB Output is correct
12 Correct 1 ms 8528 KB Output is correct
13 Correct 2 ms 8528 KB Output is correct
14 Correct 2 ms 8528 KB Output is correct
15 Correct 1 ms 8528 KB Output is correct
16 Correct 2 ms 8528 KB Output is correct
17 Correct 2 ms 8528 KB Output is correct
18 Correct 1 ms 8528 KB Output is correct
19 Correct 2 ms 8528 KB Output is correct
20 Correct 1 ms 8528 KB Output is correct
21 Correct 1 ms 8528 KB Output is correct
22 Correct 1 ms 8528 KB Output is correct
23 Correct 1 ms 8528 KB Output is correct
24 Correct 1 ms 8528 KB Output is correct
25 Correct 1 ms 8696 KB Output is correct
26 Correct 2 ms 8528 KB Output is correct
27 Correct 2 ms 8696 KB Output is correct
28 Correct 2 ms 8528 KB Output is correct
29 Correct 2 ms 8528 KB Output is correct
30 Correct 125 ms 22348 KB Output is correct
31 Correct 121 ms 22272 KB Output is correct
32 Correct 86 ms 28668 KB Output is correct
33 Correct 95 ms 28744 KB Output is correct
34 Correct 102 ms 28668 KB Output is correct
35 Correct 93 ms 28744 KB Output is correct
36 Correct 90 ms 24596 KB Output is correct
37 Correct 84 ms 24648 KB Output is correct
38 Correct 77 ms 22268 KB Output is correct
39 Correct 91 ms 22268 KB Output is correct
40 Correct 101 ms 22268 KB Output is correct
41 Correct 104 ms 22344 KB Output is correct
42 Correct 98 ms 22344 KB Output is correct
43 Correct 83 ms 28668 KB Output is correct
44 Correct 2 ms 8700 KB Output is correct
45 Correct 1 ms 8528 KB Output is correct
46 Runtime error 12 ms 17232 KB Execution killed with signal 6
47 Halted 0 ms 0 KB -