답안 #464895

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
464895	2021-08-14T11:53:01 Z	blue	고대 책들 (IOI17_books)	C++17	50 / 100	207 ms	23780 KB

books

#include "books.h"
#include <vector>
#include <cstdlib>
#include <algorithm>
#include <iostream>
using namespace std;

const int maxN = 1'000'000;

const int ind_R = 1'000'005;
const int ind_L = -1;

const long long INF = 1'000'000'000'000'000'000LL;

int N;
vector<int> P;

int S;

int cycle_ind = -1;
vector<int> cycle(maxN, -1);
vector<int> L(maxN, ind_R);
vector<int> R(maxN, ind_L);

long long essential_cost = 0;

void extend(int& l, int& r) //[l, r] is extended fully except for the cycles of l and r
{
	int l_new = min(L[cycle[l]], L[cycle[r]]);
	int r_new = max(R[cycle[l]], R[cycle[r]]);

	// cerr << "ln = " << l_new << ", rn = " << r_new << '\n';

	while(l_new <= l-1 || r+1 <= r_new)
	{
		if(l_new <= l-1)
		{
			l--;
			l_new = min(l_new, L[cycle[l]]);
			r_new = max(r_new, R[cycle[l]]);
		}

		if(r+1 <= r_new)
		{
			r++;
			l_new = min(l_new, L[cycle[r]]);
			r_new = max(r_new, R[cycle[r]]);
		}
	}
}

long long minimum_walk(vector<int> p, int s)
{
	N = p.size();
	P = p;
	S = s;

	int solve_L = S;
	int solve_R = S;

	for(int i = 0; i < N; i++)
	{
		essential_cost += abs(P[i] - i);

		if(P[i] != i)
		{
			solve_L = min(solve_L, i);
			solve_R = max(solve_R, i);
		}

		if(cycle[i] != -1) continue;

		cycle_ind++;

		int j = i;
		do
		{
			cycle[j] = cycle_ind;

			L[ cycle[j] ] = min(L[ cycle[j] ], j);
			R[ cycle[j] ] = max(R[ cycle[j] ], j);

			j = P[j];
		} while(j != i);
	}

	if(solve_L == S && solve_R == S) return 0;

	// for(int i = 0; i < N; i++) cerr << cycle[i] << ' ';
	// cerr << '\n';
	//
	// cerr << "solve range = " <<  solve_L << ' ' << solve_R << '\n';


	long long extra_cost = 0;

	int l = S;
	int r = S;
	// cerr << "l = " << l << ", r = " << r << '\n';
	extend(l, r);
	// cerr << "l = " << l << ", r = " << r << '\n';

	while(l != solve_L || r != solve_R)
	{
		extend(l, r);

		int new_l = -1, new_r = -1;
		for(int i = l-1; i >= solve_L; i--)
		{
			if(P[i] != i)
			{
				new_l = i;
				break;
			}
		}
		for(int i = r+1; i <= solve_R; i++)
		{
			if(P[i] != i)
			{
				new_r = i;
				break;
			}
		}

		if(new_l != -1 && new_r != -1)
		{
			if(S <= R[ cycle[new_l] ]) //&& L[ cycle[new_r] ] <= S
			{
				extra_cost += min(2*(new_r - r), 2*(l - new_l));
			}
			else
			{
				extra_cost += 2*(new_r - r) + 2*(l - new_l);
			}

			l = new_l;
			r = new_r;
			extend(l, r);
		}
		else if(new_l != -1)
		{
			extra_cost += 2*(l - new_l);
			l = new_l;
			extend(l, r);
		}
		else if(new_r != -1)
		{
			extra_cost += 2*(new_r - r);
			r = new_r;
			extend(l, r);
		}
		else break;
	}

	return essential_cost + extra_cost;
}

Subtask #1

12.0 / 12.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	11980 KB	Output is correct
2	Correct	7 ms	11980 KB	Output is correct
3	Correct	7 ms	11980 KB	Output is correct
4	Correct	7 ms	11980 KB	Output is correct
5	Correct	6 ms	11980 KB	Output is correct
6	Correct	7 ms	11980 KB	Output is correct
7	Correct	7 ms	11980 KB	Output is correct
8	Correct	7 ms	11968 KB	Output is correct
9	Correct	7 ms	12004 KB	Output is correct
10	Correct	7 ms	11980 KB	Output is correct
11	Correct	7 ms	11980 KB	Output is correct
12	Correct	7 ms	11936 KB	Output is correct
13	Correct	7 ms	12020 KB	Output is correct
14	Correct	7 ms	11980 KB	Output is correct
15	Correct	6 ms	11980 KB	Output is correct
16	Correct	7 ms	11980 KB	Output is correct
17	Correct	7 ms	11980 KB	Output is correct
18	Correct	6 ms	11980 KB	Output is correct

Subtask #2

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	11980 KB	Output is correct
2	Correct	7 ms	11980 KB	Output is correct
3	Correct	7 ms	11980 KB	Output is correct
4	Correct	7 ms	11980 KB	Output is correct
5	Correct	6 ms	11980 KB	Output is correct
6	Correct	7 ms	11980 KB	Output is correct
7	Correct	7 ms	11980 KB	Output is correct
8	Correct	7 ms	11968 KB	Output is correct
9	Correct	7 ms	12004 KB	Output is correct
10	Correct	7 ms	11980 KB	Output is correct
11	Correct	7 ms	11980 KB	Output is correct
12	Correct	7 ms	11936 KB	Output is correct
13	Correct	7 ms	12020 KB	Output is correct
14	Correct	7 ms	11980 KB	Output is correct
15	Correct	6 ms	11980 KB	Output is correct
16	Correct	7 ms	11980 KB	Output is correct
17	Correct	7 ms	11980 KB	Output is correct
18	Correct	6 ms	11980 KB	Output is correct
19	Correct	7 ms	12028 KB	Output is correct
20	Correct	7 ms	12088 KB	Output is correct
21	Correct	7 ms	12040 KB	Output is correct
22	Correct	7 ms	12060 KB	Output is correct
23	Correct	7 ms	11980 KB	Output is correct
24	Correct	7 ms	11976 KB	Output is correct
25	Correct	7 ms	11984 KB	Output is correct
26	Correct	7 ms	12144 KB	Output is correct
27	Correct	8 ms	12044 KB	Output is correct
28	Correct	7 ms	11980 KB	Output is correct
29	Correct	7 ms	11988 KB	Output is correct

Subtask #3

28.0 / 28.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	11980 KB	Output is correct
2	Correct	7 ms	11980 KB	Output is correct
3	Correct	7 ms	11980 KB	Output is correct
4	Correct	7 ms	11980 KB	Output is correct
5	Correct	6 ms	11980 KB	Output is correct
6	Correct	7 ms	11980 KB	Output is correct
7	Correct	7 ms	11980 KB	Output is correct
8	Correct	7 ms	11968 KB	Output is correct
9	Correct	7 ms	12004 KB	Output is correct
10	Correct	7 ms	11980 KB	Output is correct
11	Correct	7 ms	11980 KB	Output is correct
12	Correct	7 ms	11936 KB	Output is correct
13	Correct	7 ms	12020 KB	Output is correct
14	Correct	7 ms	11980 KB	Output is correct
15	Correct	6 ms	11980 KB	Output is correct
16	Correct	7 ms	11980 KB	Output is correct
17	Correct	7 ms	11980 KB	Output is correct
18	Correct	6 ms	11980 KB	Output is correct
19	Correct	7 ms	12028 KB	Output is correct
20	Correct	7 ms	12088 KB	Output is correct
21	Correct	7 ms	12040 KB	Output is correct
22	Correct	7 ms	12060 KB	Output is correct
23	Correct	7 ms	11980 KB	Output is correct
24	Correct	7 ms	11976 KB	Output is correct
25	Correct	7 ms	11984 KB	Output is correct
26	Correct	7 ms	12144 KB	Output is correct
27	Correct	8 ms	12044 KB	Output is correct
28	Correct	7 ms	11980 KB	Output is correct
29	Correct	7 ms	11988 KB	Output is correct
30	Correct	192 ms	23772 KB	Output is correct
31	Correct	207 ms	23780 KB	Output is correct
32	Correct	143 ms	23744 KB	Output is correct
33	Correct	145 ms	23764 KB	Output is correct
34	Correct	146 ms	23752 KB	Output is correct
35	Correct	154 ms	23776 KB	Output is correct
36	Correct	152 ms	23752 KB	Output is correct
37	Correct	146 ms	23768 KB	Output is correct
38	Correct	142 ms	23748 KB	Output is correct
39	Correct	162 ms	23744 KB	Output is correct
40	Correct	149 ms	23752 KB	Output is correct
41	Correct	159 ms	23748 KB	Output is correct
42	Correct	159 ms	23748 KB	Output is correct
43	Correct	148 ms	23764 KB	Output is correct

Subtask #4

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	6 ms	11980 KB	3rd lines differ - on the 1st token, expected: '3304', found: '3974'
2	Halted	0 ms	0 KB	-

Subtask #5

0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	11980 KB	Output is correct
2	Correct	7 ms	11980 KB	Output is correct
3	Correct	7 ms	11980 KB	Output is correct
4	Correct	7 ms	11980 KB	Output is correct
5	Correct	6 ms	11980 KB	Output is correct
6	Correct	7 ms	11980 KB	Output is correct
7	Correct	7 ms	11980 KB	Output is correct
8	Correct	7 ms	11968 KB	Output is correct
9	Correct	7 ms	12004 KB	Output is correct
10	Correct	7 ms	11980 KB	Output is correct
11	Correct	7 ms	11980 KB	Output is correct
12	Correct	7 ms	11936 KB	Output is correct
13	Correct	7 ms	12020 KB	Output is correct
14	Correct	7 ms	11980 KB	Output is correct
15	Correct	6 ms	11980 KB	Output is correct
16	Correct	7 ms	11980 KB	Output is correct
17	Correct	7 ms	11980 KB	Output is correct
18	Correct	6 ms	11980 KB	Output is correct
19	Correct	7 ms	12028 KB	Output is correct
20	Correct	7 ms	12088 KB	Output is correct
21	Correct	7 ms	12040 KB	Output is correct
22	Correct	7 ms	12060 KB	Output is correct
23	Correct	7 ms	11980 KB	Output is correct
24	Correct	7 ms	11976 KB	Output is correct
25	Correct	7 ms	11984 KB	Output is correct
26	Correct	7 ms	12144 KB	Output is correct
27	Correct	8 ms	12044 KB	Output is correct
28	Correct	7 ms	11980 KB	Output is correct
29	Correct	7 ms	11988 KB	Output is correct
30	Correct	192 ms	23772 KB	Output is correct
31	Correct	207 ms	23780 KB	Output is correct
32	Correct	143 ms	23744 KB	Output is correct
33	Correct	145 ms	23764 KB	Output is correct
34	Correct	146 ms	23752 KB	Output is correct
35	Correct	154 ms	23776 KB	Output is correct
36	Correct	152 ms	23752 KB	Output is correct
37	Correct	146 ms	23768 KB	Output is correct
38	Correct	142 ms	23748 KB	Output is correct
39	Correct	162 ms	23744 KB	Output is correct
40	Correct	149 ms	23752 KB	Output is correct
41	Correct	159 ms	23748 KB	Output is correct
42	Correct	159 ms	23748 KB	Output is correct
43	Correct	148 ms	23764 KB	Output is correct
44	Incorrect	6 ms	11980 KB	3rd lines differ - on the 1st token, expected: '3304', found: '3974'
45	Halted	0 ms	0 KB	-