답안 #299048

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
299048	2020-09-14T12:44:06 Z	keko37	고대 책들 (IOI17_books)	C++14	50 / 100	252 ms	29688 KB

books

#include<bits/stdc++.h>
#include "books.h"

using namespace std;

typedef long long llint;
typedef vector <int> vi;
typedef pair <int, int> pi;

const int MAXN = 1000005;

llint n, s, sol, cnt;
int curr_lef, curr_rig, lim_lef, lim_rig, edge_lef = -1, edge_rig = -1;
int p[MAXN], ok_pref[MAXN], ok_suf[MAXN];
int bio[MAXN], lo[MAXN], hi[MAXN];

void precompute_ok () {
	for (int i = 0; i < n; i++) {
		if (i > 0) ok_pref[i] |= ok_pref[i - 1];
		if (i != p[i]) ok_pref[i] = 1;
		if (ok_pref[i] == 1 && edge_lef == -1) edge_lef = i;
	}
	for (int i = n-1; i >= 0; i--) {
		if (i + 1 < n) ok_suf[i] |= ok_suf[i + 1];
		if (i != p[i]) ok_suf[i] = 1;
		if (ok_suf[i] == 1 && edge_rig == -1) edge_rig = i;
	}
	while (ok_pref[s] == 0) s++, sol += 2;
	while (ok_suf[s] == 0) s--, sol += 2;	
}

void dfs (int x) {
	bio[x] = cnt;
	lo[cnt] = min(lo[cnt], x);
	hi[cnt] = max(hi[cnt], x);
	if (bio[p[x]] == 0) dfs(p[x]);
}

void find_cycles () {
	for (int i = 0; i < n; i++) {
		if (bio[i] == 0) {
			cnt++;
			lo[cnt] = 1e9; hi[cnt] = -1e9;
			dfs(i);
		}
	}
}

void update () {
	while (curr_lef != lim_lef || curr_rig != lim_rig) {
		if (curr_lef != lim_lef) {
			curr_lef--;
			lim_lef = min(lim_lef, lo[bio[curr_lef]]);
			lim_rig = max(lim_rig, hi[bio[curr_lef]]);
		} else if (curr_rig != lim_rig) {
			curr_rig++;
			lim_lef = min(lim_lef, lo[bio[curr_rig]]);
			lim_rig = max(lim_rig, hi[bio[curr_rig]]);
		}
	}
}

pi cost_lef (int lef, int rig) {
	int res = 0;
	int lim = lef;
	while (1) {
		if (lef == lim) {
			if (lef == edge_lef) return {edge_lef - 1, res};
			lef--; res++;
			if (hi[bio[lef]] > rig) return {lef, res};
			lim = min(lim, lo[bio[lef]]);
		} else {
			lef--;
			if (hi[bio[lef]] > rig) return {lef, res};
			lim = min(lim, lo[bio[lef]]);
		}
	}
}

pi cost_rig (int lef, int rig) {
	int res = 0;
	int lim = rig;
	while (1) {
		if (rig == lim) {
			if (rig == edge_rig) return {edge_rig + 1, res};
			rig++; res++;
			if (lo[bio[rig]] < lef) return {rig, res};
			lim = max(lim, hi[bio[rig]]);
		} else {
			rig++;
			if (lo[bio[rig]] < lef) return {rig, res};
			lim = max(lim, hi[bio[rig]]);
		}
	}
}

void solve () {
	while (1) {
		pi clef = cost_lef(curr_lef, curr_rig);
		pi crig = cost_rig(curr_lef, curr_rig);
		if (clef.first < edge_lef || crig.first > edge_rig) {
			sol += 2 * (clef.second + crig.second);
			break;
		}
		if (clef.second < crig.second) {
			sol += 2 * clef.second;
			lim_lef = clef.first;
			update();
		} else {
			sol += crig.second;
			lim_rig = 2 * crig.first;
			update();
		}
	}
}

llint minimum_walk (vi P, int S) {
	n = P.size(); s = S;
	bool same = 1;
	for (int i = 0; i < n; i++) {
		p[i] = P[i];
		if (p[i] != i) same = 0;
		sol += abs(i - p[i]);
	}
	if (same) return 0;
	precompute_ok();
	find_cycles();
	curr_lef = curr_rig = s;
	lim_lef = lo[bio[s]], lim_rig = hi[bio[s]];
	update();
	solve();
	return sol;
}

Subtask #1

12.0 / 12.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	0 ms	384 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	384 KB	Output is correct
7	Correct	1 ms	384 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	0 ms	384 KB	Output is correct
11	Correct	0 ms	256 KB	Output is correct
12	Correct	0 ms	384 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	0 ms	384 KB	Output is correct
15	Correct	0 ms	384 KB	Output is correct
16	Correct	0 ms	384 KB	Output is correct
17	Correct	0 ms	384 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct

Subtask #2

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	0 ms	384 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	384 KB	Output is correct
7	Correct	1 ms	384 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	0 ms	384 KB	Output is correct
11	Correct	0 ms	256 KB	Output is correct
12	Correct	0 ms	384 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	0 ms	384 KB	Output is correct
15	Correct	0 ms	384 KB	Output is correct
16	Correct	0 ms	384 KB	Output is correct
17	Correct	0 ms	384 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	1 ms	384 KB	Output is correct
20	Correct	1 ms	384 KB	Output is correct
21	Correct	1 ms	384 KB	Output is correct
22	Correct	1 ms	384 KB	Output is correct
23	Correct	1 ms	384 KB	Output is correct
24	Correct	1 ms	384 KB	Output is correct
25	Correct	1 ms	384 KB	Output is correct
26	Correct	1 ms	384 KB	Output is correct
27	Correct	1 ms	384 KB	Output is correct
28	Correct	1 ms	384 KB	Output is correct
29	Correct	1 ms	384 KB	Output is correct

Subtask #3

28.0 / 28.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	0 ms	384 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	384 KB	Output is correct
7	Correct	1 ms	384 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	0 ms	384 KB	Output is correct
11	Correct	0 ms	256 KB	Output is correct
12	Correct	0 ms	384 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	0 ms	384 KB	Output is correct
15	Correct	0 ms	384 KB	Output is correct
16	Correct	0 ms	384 KB	Output is correct
17	Correct	0 ms	384 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	1 ms	384 KB	Output is correct
20	Correct	1 ms	384 KB	Output is correct
21	Correct	1 ms	384 KB	Output is correct
22	Correct	1 ms	384 KB	Output is correct
23	Correct	1 ms	384 KB	Output is correct
24	Correct	1 ms	384 KB	Output is correct
25	Correct	1 ms	384 KB	Output is correct
26	Correct	1 ms	384 KB	Output is correct
27	Correct	1 ms	384 KB	Output is correct
28	Correct	1 ms	384 KB	Output is correct
29	Correct	1 ms	384 KB	Output is correct
30	Correct	252 ms	23868 KB	Output is correct
31	Correct	252 ms	23800 KB	Output is correct
32	Correct	153 ms	12024 KB	Output is correct
33	Correct	192 ms	29176 KB	Output is correct
34	Correct	197 ms	29176 KB	Output is correct
35	Correct	203 ms	28152 KB	Output is correct
36	Correct	188 ms	25848 KB	Output is correct
37	Correct	179 ms	24184 KB	Output is correct
38	Correct	192 ms	23928 KB	Output is correct
39	Correct	181 ms	23800 KB	Output is correct
40	Correct	191 ms	23800 KB	Output is correct
41	Correct	211 ms	23800 KB	Output is correct
42	Correct	210 ms	23800 KB	Output is correct
43	Correct	194 ms	29688 KB	Output is correct

Subtask #4

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	1 ms	384 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Incorrect	1 ms	384 KB	3rd lines differ - on the 1st token, expected: '22140', found: '22127'
7	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	384 KB	Output is correct
2	Correct	1 ms	384 KB	Output is correct
3	Correct	0 ms	384 KB	Output is correct
4	Correct	1 ms	384 KB	Output is correct
5	Correct	1 ms	384 KB	Output is correct
6	Correct	1 ms	384 KB	Output is correct
7	Correct	1 ms	384 KB	Output is correct
8	Correct	1 ms	384 KB	Output is correct
9	Correct	0 ms	384 KB	Output is correct
10	Correct	0 ms	384 KB	Output is correct
11	Correct	0 ms	256 KB	Output is correct
12	Correct	0 ms	384 KB	Output is correct
13	Correct	1 ms	384 KB	Output is correct
14	Correct	0 ms	384 KB	Output is correct
15	Correct	0 ms	384 KB	Output is correct
16	Correct	0 ms	384 KB	Output is correct
17	Correct	0 ms	384 KB	Output is correct
18	Correct	1 ms	384 KB	Output is correct
19	Correct	1 ms	384 KB	Output is correct
20	Correct	1 ms	384 KB	Output is correct
21	Correct	1 ms	384 KB	Output is correct
22	Correct	1 ms	384 KB	Output is correct
23	Correct	1 ms	384 KB	Output is correct
24	Correct	1 ms	384 KB	Output is correct
25	Correct	1 ms	384 KB	Output is correct
26	Correct	1 ms	384 KB	Output is correct
27	Correct	1 ms	384 KB	Output is correct
28	Correct	1 ms	384 KB	Output is correct
29	Correct	1 ms	384 KB	Output is correct
30	Correct	252 ms	23868 KB	Output is correct
31	Correct	252 ms	23800 KB	Output is correct
32	Correct	153 ms	12024 KB	Output is correct
33	Correct	192 ms	29176 KB	Output is correct
34	Correct	197 ms	29176 KB	Output is correct
35	Correct	203 ms	28152 KB	Output is correct
36	Correct	188 ms	25848 KB	Output is correct
37	Correct	179 ms	24184 KB	Output is correct
38	Correct	192 ms	23928 KB	Output is correct
39	Correct	181 ms	23800 KB	Output is correct
40	Correct	191 ms	23800 KB	Output is correct
41	Correct	211 ms	23800 KB	Output is correct
42	Correct	210 ms	23800 KB	Output is correct
43	Correct	194 ms	29688 KB	Output is correct
44	Correct	1 ms	384 KB	Output is correct
45	Correct	1 ms	384 KB	Output is correct
46	Correct	1 ms	384 KB	Output is correct
47	Correct	1 ms	384 KB	Output is correct
48	Correct	1 ms	384 KB	Output is correct
49	Incorrect	1 ms	384 KB	3rd lines differ - on the 1st token, expected: '22140', found: '22127'
50	Halted	0 ms	0 KB	-