Submission #1104937

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1104937	2024-10-24T19:19:39 Z	alexander707070	Ancient Books (IOI17_books)	C++14	50 / 100	122 ms	28760 KB

books

#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;
	}
	last=0; fr=n+1;

	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,r;

	int pt=s;
	while(pt<n){
		int t=0;
		
		pt=where[cycle[pt]].second+1;
		t++;

		while(pt<=n and where[cycle[pt]].first>=s){
			if(where[cycle[pt]].second==pt){
				pt++; t++;
			}else{
				pt=where[cycle[pt]].second;
			}
		}

		if(pt<=n)r.push_back(t);
	}

	pt=s;
	while(pt>1){
		int t=0;
		
		pt=where[cycle[pt]].first-1;
		t++;

		while(pt>=1 and where[cycle[pt]].second<=s){
			if(where[cycle[pt]].first==pt){
				pt--; t++;
			}else{
				pt=where[cycle[pt]].first;
			}
		}

		if(pt>=1)l.push_back(t);
	}

	if(s!=1)cout<<1/0;

	for(int i=0;i<l.size();i++){
		ans+=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";

	return 0;
}*/

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:109:17: warning: division by zero [-Wdiv-by-zero]
  109 |  if(s!=1)cout<<1/0;
      |                ~^~
books.cpp:111:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |  for(int i=0;i<l.size();i++){
      |              ~^~~~~~~~~

Subtask #1
12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	6480 KB	Output is correct
2	Correct	2 ms	6648 KB	Output is correct
3	Correct	2 ms	6480 KB	Output is correct
4	Correct	1 ms	6480 KB	Output is correct
5	Correct	1 ms	6732 KB	Output is correct
6	Correct	2 ms	6480 KB	Output is correct
7	Correct	2 ms	6480 KB	Output is correct
8	Correct	2 ms	6480 KB	Output is correct
9	Correct	2 ms	6480 KB	Output is correct
10	Correct	1 ms	6480 KB	Output is correct
11	Correct	1 ms	6480 KB	Output is correct
12	Correct	1 ms	6480 KB	Output is correct
13	Correct	1 ms	6480 KB	Output is correct
14	Correct	1 ms	6652 KB	Output is correct
15	Correct	1 ms	6480 KB	Output is correct
16	Correct	1 ms	6480 KB	Output is correct
17	Correct	1 ms	6648 KB	Output is correct
18	Correct	1 ms	6480 KB	Output is correct

Subtask #2
10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	6480 KB	Output is correct
2	Correct	2 ms	6648 KB	Output is correct
3	Correct	2 ms	6480 KB	Output is correct
4	Correct	1 ms	6480 KB	Output is correct
5	Correct	1 ms	6732 KB	Output is correct
6	Correct	2 ms	6480 KB	Output is correct
7	Correct	2 ms	6480 KB	Output is correct
8	Correct	2 ms	6480 KB	Output is correct
9	Correct	2 ms	6480 KB	Output is correct
10	Correct	1 ms	6480 KB	Output is correct
11	Correct	1 ms	6480 KB	Output is correct
12	Correct	1 ms	6480 KB	Output is correct
13	Correct	1 ms	6480 KB	Output is correct
14	Correct	1 ms	6652 KB	Output is correct
15	Correct	1 ms	6480 KB	Output is correct
16	Correct	1 ms	6480 KB	Output is correct
17	Correct	1 ms	6648 KB	Output is correct
18	Correct	1 ms	6480 KB	Output is correct
19	Correct	1 ms	6480 KB	Output is correct
20	Correct	1 ms	6480 KB	Output is correct
21	Correct	2 ms	6480 KB	Output is correct
22	Correct	2 ms	6480 KB	Output is correct
23	Correct	2 ms	6652 KB	Output is correct
24	Correct	1 ms	6480 KB	Output is correct
25	Correct	1 ms	6480 KB	Output is correct
26	Correct	1 ms	6480 KB	Output is correct
27	Correct	1 ms	6480 KB	Output is correct
28	Correct	2 ms	6480 KB	Output is correct
29	Correct	1 ms	6480 KB	Output is correct

Subtask #3
28.0 / 28.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	6480 KB	Output is correct
2	Correct	2 ms	6648 KB	Output is correct
3	Correct	2 ms	6480 KB	Output is correct
4	Correct	1 ms	6480 KB	Output is correct
5	Correct	1 ms	6732 KB	Output is correct
6	Correct	2 ms	6480 KB	Output is correct
7	Correct	2 ms	6480 KB	Output is correct
8	Correct	2 ms	6480 KB	Output is correct
9	Correct	2 ms	6480 KB	Output is correct
10	Correct	1 ms	6480 KB	Output is correct
11	Correct	1 ms	6480 KB	Output is correct
12	Correct	1 ms	6480 KB	Output is correct
13	Correct	1 ms	6480 KB	Output is correct
14	Correct	1 ms	6652 KB	Output is correct
15	Correct	1 ms	6480 KB	Output is correct
16	Correct	1 ms	6480 KB	Output is correct
17	Correct	1 ms	6648 KB	Output is correct
18	Correct	1 ms	6480 KB	Output is correct
19	Correct	1 ms	6480 KB	Output is correct
20	Correct	1 ms	6480 KB	Output is correct
21	Correct	2 ms	6480 KB	Output is correct
22	Correct	2 ms	6480 KB	Output is correct
23	Correct	2 ms	6652 KB	Output is correct
24	Correct	1 ms	6480 KB	Output is correct
25	Correct	1 ms	6480 KB	Output is correct
26	Correct	1 ms	6480 KB	Output is correct
27	Correct	1 ms	6480 KB	Output is correct
28	Correct	2 ms	6480 KB	Output is correct
29	Correct	1 ms	6480 KB	Output is correct
30	Correct	115 ms	20552 KB	Output is correct
31	Correct	122 ms	20480 KB	Output is correct
32	Correct	88 ms	28672 KB	Output is correct
33	Correct	98 ms	28760 KB	Output is correct
34	Correct	95 ms	28744 KB	Output is correct
35	Correct	106 ms	28672 KB	Output is correct
36	Correct	95 ms	24576 KB	Output is correct
37	Correct	87 ms	24656 KB	Output is correct
38	Correct	85 ms	22344 KB	Output is correct
39	Correct	80 ms	22088 KB	Output is correct
40	Correct	92 ms	21324 KB	Output is correct
41	Correct	110 ms	20552 KB	Output is correct
42	Correct	100 ms	20552 KB	Output is correct
43	Correct	91 ms	28744 KB	Output is correct

Subtask #4
0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Runtime error	11 ms	12880 KB	Execution killed with signal 8
2	Halted	0 ms	0 KB	-

Subtask #5
0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	6480 KB	Output is correct
2	Correct	2 ms	6648 KB	Output is correct
3	Correct	2 ms	6480 KB	Output is correct
4	Correct	1 ms	6480 KB	Output is correct
5	Correct	1 ms	6732 KB	Output is correct
6	Correct	2 ms	6480 KB	Output is correct
7	Correct	2 ms	6480 KB	Output is correct
8	Correct	2 ms	6480 KB	Output is correct
9	Correct	2 ms	6480 KB	Output is correct
10	Correct	1 ms	6480 KB	Output is correct
11	Correct	1 ms	6480 KB	Output is correct
12	Correct	1 ms	6480 KB	Output is correct
13	Correct	1 ms	6480 KB	Output is correct
14	Correct	1 ms	6652 KB	Output is correct
15	Correct	1 ms	6480 KB	Output is correct
16	Correct	1 ms	6480 KB	Output is correct
17	Correct	1 ms	6648 KB	Output is correct
18	Correct	1 ms	6480 KB	Output is correct
19	Correct	1 ms	6480 KB	Output is correct
20	Correct	1 ms	6480 KB	Output is correct
21	Correct	2 ms	6480 KB	Output is correct
22	Correct	2 ms	6480 KB	Output is correct
23	Correct	2 ms	6652 KB	Output is correct
24	Correct	1 ms	6480 KB	Output is correct
25	Correct	1 ms	6480 KB	Output is correct
26	Correct	1 ms	6480 KB	Output is correct
27	Correct	1 ms	6480 KB	Output is correct
28	Correct	2 ms	6480 KB	Output is correct
29	Correct	1 ms	6480 KB	Output is correct
30	Correct	115 ms	20552 KB	Output is correct
31	Correct	122 ms	20480 KB	Output is correct
32	Correct	88 ms	28672 KB	Output is correct
33	Correct	98 ms	28760 KB	Output is correct
34	Correct	95 ms	28744 KB	Output is correct
35	Correct	106 ms	28672 KB	Output is correct
36	Correct	95 ms	24576 KB	Output is correct
37	Correct	87 ms	24656 KB	Output is correct
38	Correct	85 ms	22344 KB	Output is correct
39	Correct	80 ms	22088 KB	Output is correct
40	Correct	92 ms	21324 KB	Output is correct
41	Correct	110 ms	20552 KB	Output is correct
42	Correct	100 ms	20552 KB	Output is correct
43	Correct	91 ms	28744 KB	Output is correct
44	Runtime error	11 ms	12880 KB	Execution killed with signal 8
45	Halted	0 ms	0 KB	-

Submission #1104937

Compilation message

Subtask #1 12.0 / 12.0

Subtask #2 10.0 / 10.0

Subtask #3 28.0 / 28.0

Subtask #4 0 / 20.0

Subtask #5 0 / 30.0

Subtask #1
12.0 / 12.0

Subtask #2
10.0 / 10.0

Subtask #3
28.0 / 28.0

Subtask #4
0 / 20.0

Subtask #5
0 / 30.0