Submission #286902

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
286902	2020-08-31T06:52:59 Z	tmwilliamlin168	Ancient Books (IOI17_books)	C++14	12 / 100	45 ms	71032 KB

books

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

#define ll long long
#define ar array

const int mxN=1e6;
int n, a, b, who[mxN];
vector<int> adj[mxN], adj2[mxN], st, adj3[mxN];
bool vis[mxN];
ar<int, 3> dp[mxN];

void dfs1(int u) {
	vis[u]=1;
	for(int v : adj[u])
		if(!vis[v])
			dfs1(v);
	st.push_back(u);
}

void dfs2(int u, int r) {
	vis[u]=0;
	who[u]=r;
	for(int v : adj2[u])
		if(vis[v])
			dfs2(v, r);
}

ll minimum_walk(vector<int> p, int s) {
	n=p.size();
	ll ans=0;
	for(; a<s&&p[a]==a; ++a);
	for(b=n-1; b>s&&p[b]==b; --b);
	for(int i=a; i<s; ++i)
		adj[i].push_back(i+1);
	for(int i=b; i>s; --i)
		adj[i].push_back(i-1);
	for(int i=a; i<=b; ++i) {
		ans+=abs(i-p[i]);
		adj[i].push_back(p[i]);
	}
	for(int i=a; i<=b; ++i)
		if(!vis[i])
			dfs1(i);
	for(int i=a; i<=b; ++i)
		for(int j : adj[i])
			adj2[j].push_back(i);
	for(int i=st.size()-1; ~i; --i) {
		if(!vis[st[i]])
			continue;
		dfs2(st[i], st[i]);
		dp[st[i]]={n, n, n};
		if(!vis[a]&&st[i]==who[a])
			dp[st[i]][0]=0;
		if(!vis[b]&&st[i]==who[b])
			dp[st[i]][1]=0;
		for(int j : adj2[st[i]])
			if(who[j]!=st[i])
				for(int k : {0, 1, 2})
					dp[st[i]][k]=min(dp[who[j]][k]+1, dp[st[i]][k]);
		dp[st[i]][2]=min(dp[st[i]][0]+dp[st[i]][1], dp[st[i]][2]);
	}
	return ans+2*dp[who[s]][2];
}

Subtask #1

12.0 / 12.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	43 ms	70776 KB	Output is correct
2	Correct	45 ms	70824 KB	Output is correct
3	Correct	43 ms	70784 KB	Output is correct
4	Correct	43 ms	70776 KB	Output is correct
5	Correct	42 ms	70776 KB	Output is correct
6	Correct	44 ms	70776 KB	Output is correct
7	Correct	42 ms	70776 KB	Output is correct
8	Correct	42 ms	70776 KB	Output is correct
9	Correct	42 ms	70776 KB	Output is correct
10	Correct	42 ms	70780 KB	Output is correct
11	Correct	42 ms	70776 KB	Output is correct
12	Correct	43 ms	70776 KB	Output is correct
13	Correct	43 ms	70776 KB	Output is correct
14	Correct	42 ms	70784 KB	Output is correct
15	Correct	43 ms	70776 KB	Output is correct
16	Correct	43 ms	70776 KB	Output is correct
17	Correct	42 ms	70784 KB	Output is correct
18	Correct	42 ms	70780 KB	Output is correct

Subtask #2

0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	43 ms	70776 KB	Output is correct
2	Correct	45 ms	70824 KB	Output is correct
3	Correct	43 ms	70784 KB	Output is correct
4	Correct	43 ms	70776 KB	Output is correct
5	Correct	42 ms	70776 KB	Output is correct
6	Correct	44 ms	70776 KB	Output is correct
7	Correct	42 ms	70776 KB	Output is correct
8	Correct	42 ms	70776 KB	Output is correct
9	Correct	42 ms	70776 KB	Output is correct
10	Correct	42 ms	70780 KB	Output is correct
11	Correct	42 ms	70776 KB	Output is correct
12	Correct	43 ms	70776 KB	Output is correct
13	Correct	43 ms	70776 KB	Output is correct
14	Correct	42 ms	70784 KB	Output is correct
15	Correct	43 ms	70776 KB	Output is correct
16	Correct	43 ms	70776 KB	Output is correct
17	Correct	42 ms	70784 KB	Output is correct
18	Correct	42 ms	70780 KB	Output is correct
19	Correct	44 ms	70904 KB	Output is correct
20	Correct	43 ms	71032 KB	Output is correct
21	Correct	43 ms	70776 KB	Output is correct
22	Incorrect	43 ms	70904 KB	3rd lines differ - on the 1st token, expected: '2082', found: '2788'
23	Halted	0 ms	0 KB	-

Subtask #3

0 / 28.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	43 ms	70776 KB	Output is correct
2	Correct	45 ms	70824 KB	Output is correct
3	Correct	43 ms	70784 KB	Output is correct
4	Correct	43 ms	70776 KB	Output is correct
5	Correct	42 ms	70776 KB	Output is correct
6	Correct	44 ms	70776 KB	Output is correct
7	Correct	42 ms	70776 KB	Output is correct
8	Correct	42 ms	70776 KB	Output is correct
9	Correct	42 ms	70776 KB	Output is correct
10	Correct	42 ms	70780 KB	Output is correct
11	Correct	42 ms	70776 KB	Output is correct
12	Correct	43 ms	70776 KB	Output is correct
13	Correct	43 ms	70776 KB	Output is correct
14	Correct	42 ms	70784 KB	Output is correct
15	Correct	43 ms	70776 KB	Output is correct
16	Correct	43 ms	70776 KB	Output is correct
17	Correct	42 ms	70784 KB	Output is correct
18	Correct	42 ms	70780 KB	Output is correct
19	Correct	44 ms	70904 KB	Output is correct
20	Correct	43 ms	71032 KB	Output is correct
21	Correct	43 ms	70776 KB	Output is correct
22	Incorrect	43 ms	70904 KB	3rd lines differ - on the 1st token, expected: '2082', found: '2788'
23	Halted	0 ms	0 KB	-

Subtask #4

0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	44 ms	70876 KB	Output is correct
2	Correct	43 ms	70912 KB	Output is correct
3	Correct	44 ms	70904 KB	Output is correct
4	Incorrect	43 ms	70904 KB	3rd lines differ - on the 1st token, expected: '2094', found: '2818'
5	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	43 ms	70776 KB	Output is correct
2	Correct	45 ms	70824 KB	Output is correct
3	Correct	43 ms	70784 KB	Output is correct
4	Correct	43 ms	70776 KB	Output is correct
5	Correct	42 ms	70776 KB	Output is correct
6	Correct	44 ms	70776 KB	Output is correct
7	Correct	42 ms	70776 KB	Output is correct
8	Correct	42 ms	70776 KB	Output is correct
9	Correct	42 ms	70776 KB	Output is correct
10	Correct	42 ms	70780 KB	Output is correct
11	Correct	42 ms	70776 KB	Output is correct
12	Correct	43 ms	70776 KB	Output is correct
13	Correct	43 ms	70776 KB	Output is correct
14	Correct	42 ms	70784 KB	Output is correct
15	Correct	43 ms	70776 KB	Output is correct
16	Correct	43 ms	70776 KB	Output is correct
17	Correct	42 ms	70784 KB	Output is correct
18	Correct	42 ms	70780 KB	Output is correct
19	Correct	44 ms	70904 KB	Output is correct
20	Correct	43 ms	71032 KB	Output is correct
21	Correct	43 ms	70776 KB	Output is correct
22	Incorrect	43 ms	70904 KB	3rd lines differ - on the 1st token, expected: '2082', found: '2788'
23	Halted	0 ms	0 KB	-