Submission #560321

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
560321	2022-05-11T09:40:53 Z	jamezzz	Ancient Books (IOI17_books)	C++17	50 / 100	2000 ms	26572 KB

books

#include "books.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> ii;

#define maxn 1000005

int n,cl[maxn],cr[maxn],c[maxn];

void extend(int &l,int &r){
	//printf("extend: %d %d\n",l,r);
	int farl=min(cl[c[l]],cl[c[r]]);
	int farr=max(cr[c[l]],cr[c[r]]);
	while(true){
		if(farl<l){
			--l;
			farl=min(farl,cl[c[l]]);
			farr=max(farr,cr[c[l]]);
		}
		else if(r<farr){
			++r;
			farl=min(farl,cl[c[r]]);
			farr=max(farr,cr[c[r]]);
		}
		else break;
	}
	//printf("res: %d %d\n",l,r);
}

ll minimum_walk(vector<int> p,int s){
	n=p.size();
	int lbound=s,rbound=s;
	ll ans=0;int cnt=1;
	for(int i=0;i<n;++i){
		if(c[i]!=0)continue;
		int x=i;
		cl[cnt]=cr[cnt]=i;
		while(true){
			c[x]=cnt;
			cl[cnt]=min(cl[cnt],x);
			cr[cnt]=max(cr[cnt],x);
			ans+=abs(x-p[x]);
			x=p[x];
			if(x==i)break;
		}
		if(x!=p[x]){
			lbound=min(lbound,cl[cnt]);
			rbound=max(rbound,cr[cnt]);
		}
		++cnt;
	}
	
	int l=s,r=s;
	while(l!=lbound||r!=rbound){
		//printf("%d %d\n",l,r);
		extend(l,r);
		bool can=false;
		int newl=n,newr=0;
		
		int tmpl=l,tmpr=r;
		int lcost=0;
		while(true){
			if(tmpl<=lbound)break;//done
			--tmpl;lcost+=2;
			extend(tmpl,tmpr);
			if(tmpr>r){
				can=true;
				break;
			}
		}
		tmpl=l,tmpr=r;
		int rcost=0;
		while(true){
			if(tmpr>=rbound)break;//done
			++tmpr;rcost+=2;
			extend(tmpl,tmpr);
			if(tmpl<l){
				can=true;
				break;
			}
		}
		
		if(can)ans+=min(lcost,rcost);
		else ans+=lcost+rcost;
		
		l=tmpl,r=tmpr;
	}
	return ans;
}

Compilation message

books.cpp: In function 'll minimum_walk(std::vector<int>, int)':
books.cpp:60:7: warning: unused variable 'newl' [-Wunused-variable]
   60 |   int newl=n,newr=0;
      |       ^~~~
books.cpp:60:14: warning: unused variable 'newr' [-Wunused-variable]
   60 |   int newl=n,newr=0;
      |              ^~~~

Subtask #1

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	308 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	1 ms	304 KB	Output is correct
6	Correct	1 ms	312 KB	Output is correct
7	Correct	1 ms	308 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	308 KB	Output is correct
10	Correct	1 ms	308 KB	Output is correct
11	Correct	1 ms	308 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	312 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	1 ms	304 KB	Output is correct
18	Correct	1 ms	308 KB	Output is correct

Subtask #2

10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	308 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	1 ms	304 KB	Output is correct
6	Correct	1 ms	312 KB	Output is correct
7	Correct	1 ms	308 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	308 KB	Output is correct
10	Correct	1 ms	308 KB	Output is correct
11	Correct	1 ms	308 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	312 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	1 ms	304 KB	Output is correct
18	Correct	1 ms	308 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	1 ms	336 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	304 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	340 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct

Subtask #3

28.0 / 28.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	308 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	1 ms	304 KB	Output is correct
6	Correct	1 ms	312 KB	Output is correct
7	Correct	1 ms	308 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	308 KB	Output is correct
10	Correct	1 ms	308 KB	Output is correct
11	Correct	1 ms	308 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	312 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	1 ms	304 KB	Output is correct
18	Correct	1 ms	308 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	1 ms	336 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	304 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	340 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct
30	Correct	173 ms	18660 KB	Output is correct
31	Correct	150 ms	18660 KB	Output is correct
32	Correct	124 ms	26572 KB	Output is correct
33	Correct	155 ms	24160 KB	Output is correct
34	Correct	134 ms	24208 KB	Output is correct
35	Correct	138 ms	23008 KB	Output is correct
36	Correct	134 ms	20704 KB	Output is correct
37	Correct	127 ms	18916 KB	Output is correct
38	Correct	153 ms	18788 KB	Output is correct
39	Correct	133 ms	18800 KB	Output is correct
40	Correct	135 ms	18660 KB	Output is correct
41	Correct	161 ms	18664 KB	Output is correct
42	Correct	151 ms	18852 KB	Output is correct
43	Correct	132 ms	24512 KB	Output is correct

Subtask #4

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	340 KB	Output is correct
2	Correct	1 ms	340 KB	Output is correct
3	Correct	1 ms	304 KB	Output is correct
4	Execution timed out	2087 ms	340 KB	Time limit exceeded
5	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	308 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	1 ms	256 KB	Output is correct
5	Correct	1 ms	304 KB	Output is correct
6	Correct	1 ms	312 KB	Output is correct
7	Correct	1 ms	308 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	308 KB	Output is correct
10	Correct	1 ms	308 KB	Output is correct
11	Correct	1 ms	308 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	312 KB	Output is correct
15	Correct	1 ms	212 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	1 ms	304 KB	Output is correct
18	Correct	1 ms	308 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	1 ms	336 KB	Output is correct
23	Correct	1 ms	340 KB	Output is correct
24	Correct	1 ms	304 KB	Output is correct
25	Correct	1 ms	212 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	340 KB	Output is correct
29	Correct	1 ms	304 KB	Output is correct
30	Correct	173 ms	18660 KB	Output is correct
31	Correct	150 ms	18660 KB	Output is correct
32	Correct	124 ms	26572 KB	Output is correct
33	Correct	155 ms	24160 KB	Output is correct
34	Correct	134 ms	24208 KB	Output is correct
35	Correct	138 ms	23008 KB	Output is correct
36	Correct	134 ms	20704 KB	Output is correct
37	Correct	127 ms	18916 KB	Output is correct
38	Correct	153 ms	18788 KB	Output is correct
39	Correct	133 ms	18800 KB	Output is correct
40	Correct	135 ms	18660 KB	Output is correct
41	Correct	161 ms	18664 KB	Output is correct
42	Correct	151 ms	18852 KB	Output is correct
43	Correct	132 ms	24512 KB	Output is correct
44	Correct	1 ms	340 KB	Output is correct
45	Correct	1 ms	340 KB	Output is correct
46	Correct	1 ms	304 KB	Output is correct
47	Execution timed out	2087 ms	340 KB	Time limit exceeded
48	Halted	0 ms	0 KB	-