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Submission #290444

# Submission time Handle Problem Language Result Execution time Memory
290444 2020-09-03T20:00:05 Z A02 Ancient Books (IOI17_books) C++14
100 / 100
 163 ms 19200 KB 
#include <bits/stdc++.h>
#include "books.h"

using namespace std;

long long minimum_walk(vector<int> p, int s) {

    vector<int> np;
    long long book_total = 0;

    int left_start = p.size();
    int right_start = 0;
    for (int i = 0; i < p.size(); i++){
        if (p[i] != i){
            left_start = min(left_start, i);
        }
    }
    for (int i = p.size() - 1; i >= 0; i--){
        if (p[i] != i){
            right_start = max(right_start, i);
        }
    }



    if (left_start == p.size()){
        return 0;
    }

    if (s < left_start){
        s = 0;
        book_total += 2 * (left_start - s);
    } else {
        s -= left_start;
    }

    right_start -= left_start;

    if (s > right_start){
        s = right_start;
        book_total += 2 * (s - (right_start));

    }

    for (int i = left_start; i <= right_start + left_start; i++){
        np.push_back(p[i] - left_start);
        //cout << np[i - left_start] << 'a' << endl;
    }

    p = np;

	int n = p.size();

	for (int i = 0; i < n; i++){
        book_total += max(p[i] - i, i - p[i]);
	}

//	if (s == 0){
//        int current_region_max = 0;
//        int prev_visited = 0;
//        for (int i = 0; i < n; i++){
//            if (current_region_max < i && p[i] != i){
//                book_total += 2 * (i - current_region_max);
//            }
//            if (p[i] != i){
//                current_region_max = max(current_region_max, i);
//                current_region_max = max(current_region_max, p[i]);
//            }
//        }
//	}

    int left_frontier = s;
    int right_frontier = s;
    long long left_cost = 0;
    long long right_cost = 0;

    bool is_joined = true;

    int v_l_frontier = s;
    int v_r_frontier = s;

    if (p[s] < s){
        left_frontier = p[s];
    }
    if (p[s] > s){
        right_frontier = p[s];
    }
    //cout << left_frontier << ' ' << right_frontier << endl;
    while(left_frontier < v_l_frontier || right_frontier > v_r_frontier){
        if (right_frontier > v_r_frontier){

            for (int i = v_r_frontier + 1; i <= right_frontier; i++){
                v_r_frontier++;
                if (p[i] > right_frontier){
                    right_frontier = p[i];
                }
                if (p[i] < left_frontier){
                    left_frontier = p[i];
                }
            }
        }

        if (left_frontier < v_l_frontier){
            for (int i = v_l_frontier - 1; i >= left_frontier; i--){
                v_l_frontier--;
                if (p[i] > right_frontier){
                    right_frontier = p[i];
                }
                if (p[i] < left_frontier){
                    left_frontier = p[i];
                }
            }

        }
    }


    while (left_frontier > 0 || right_frontier < n - 1){
        //cout << left_frontier << 'x' << right_frontier << endl;
        is_joined = false;

        if (right_frontier < n - 1){
            int original_left_frontier = left_frontier;
            right_frontier++;
            right_cost++;

            int left_visited_frontier = left_frontier;
            int right_visited_frontier = right_frontier - 1;
            //cout << left_frontier << 'r' << right_frontier << endl;
            while(left_frontier < left_visited_frontier || right_frontier > right_visited_frontier){
                //cout << left_frontier << 's' << right_frontier << endl;
                if (right_frontier > right_visited_frontier){

                    for (int i = right_visited_frontier + 1; i <= right_frontier; i++){
                        right_visited_frontier++;
                        if (p[i] > right_frontier){
                            right_frontier = p[i];
                        }
                        if (p[i] < left_frontier){
                            left_frontier = p[i];
                        }
                    }
                }

                if (left_frontier < left_visited_frontier){
                    for (int i = left_visited_frontier - 1; i >= left_frontier; i--){
                        left_visited_frontier--;
                        if (p[i] > right_frontier){
                            right_frontier = p[i];
                        }
                        if (p[i] < left_frontier){
                            left_frontier = p[i];
                        }
                    }

                }
            }

            if (original_left_frontier != left_frontier){
                is_joined = true;
            }
        }
        //cout << 'a' << endl;
        if (!is_joined && left_frontier > 0){

            int original_right_frontier = right_frontier;
            left_frontier--;
            left_cost++;

            int left_visited_frontier = left_frontier + 1;
            int right_visited_frontier = right_frontier;
            //cout << 'c' << endl;
            while(left_frontier < left_visited_frontier || right_frontier > right_visited_frontier){
                //cout << left_frontier << 'f' << right_frontier << endl;
                //cout << left_visited_frontier << ' ' << right_visited_frontier << endl;
                if (right_frontier > right_visited_frontier){
                    //right_visited_frontier++;
                    for (int i = right_visited_frontier + 1; i <= right_frontier; i++){
                        right_visited_frontier++;
                        if (p[i] > right_frontier){
                            right_frontier = p[i];
                        }
                        if (p[i] < left_frontier){
                            left_frontier = p[i];
                        }
                    }
                }

                if (left_frontier < left_visited_frontier){
                    for (int i = left_visited_frontier - 1; i >= left_frontier; i--){
                        left_visited_frontier--;
                        if (p[i] > right_frontier){
                            right_frontier = p[i];
                        }
                        if (p[i] < left_frontier){
                            left_frontier = p[i];
                        }
                    }

                }
            }

            if (original_right_frontier != right_frontier){
                is_joined = true;
            }

        }
        //cout << 'b' << endl;
        if (is_joined){
            book_total += 2 * right_cost;
            left_cost = 0;
            right_cost = 0;
        }

    }

    book_total += 2 * (left_cost + right_cost);

	return book_total;

}

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for (int i = 0; i < p.size(); i++){
      |                     ~~^~~~~~~~~~
books.cpp:26:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     if (left_start == p.size()){
      |         ~~~~~~~~~~~^~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 0 ms 288 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 0 ms 256 KB Output is correct
13 Correct 0 ms 256 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 1 ms 256 KB Output is correct
17 Correct 0 ms 256 KB Output is correct
18 Correct 0 ms 384 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 0 ms 288 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 0 ms 256 KB Output is correct
13 Correct 0 ms 256 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 1 ms 256 KB Output is correct
17 Correct 0 ms 256 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 256 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 0 ms 384 KB Output is correct
24 Correct 0 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 0 ms 256 KB Output is correct
27 Correct 1 ms 256 KB Output is correct
28 Correct 1 ms 256 KB Output is correct
29 Correct 0 ms 384 KB Output is correct

Subtask #3
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 0 ms 288 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 0 ms 256 KB Output is correct
13 Correct 0 ms 256 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 1 ms 256 KB Output is correct
17 Correct 0 ms 256 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 256 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 0 ms 384 KB Output is correct
24 Correct 0 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 0 ms 256 KB Output is correct
27 Correct 1 ms 256 KB Output is correct
28 Correct 1 ms 256 KB Output is correct
29 Correct 0 ms 384 KB Output is correct
30 Correct 163 ms 12336 KB Output is correct
31 Correct 161 ms 12392 KB Output is correct
32 Correct 126 ms 8128 KB Output is correct
33 Correct 149 ms 12392 KB Output is correct
34 Correct 148 ms 12392 KB Output is correct
35 Correct 151 ms 12336 KB Output is correct
36 Correct 140 ms 12396 KB Output is correct
37 Correct 144 ms 12396 KB Output is correct
38 Correct 143 ms 12392 KB Output is correct
39 Correct 146 ms 12332 KB Output is correct
40 Correct 153 ms 12392 KB Output is correct
41 Correct 161 ms 12336 KB Output is correct
42 Correct 158 ms 12332 KB Output is correct
43 Correct 146 ms 12392 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 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 256 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 256 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 256 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 0 ms 384 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 256 KB Output is correct
6 Correct 0 ms 256 KB Output is correct
7 Correct 0 ms 288 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 0 ms 256 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 0 ms 256 KB Output is correct
12 Correct 0 ms 256 KB Output is correct
13 Correct 0 ms 256 KB Output is correct
14 Correct 0 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 1 ms 256 KB Output is correct
17 Correct 0 ms 256 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 0 ms 256 KB Output is correct
20 Correct 1 ms 384 KB Output is correct
21 Correct 1 ms 256 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 0 ms 384 KB Output is correct
24 Correct 0 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 0 ms 256 KB Output is correct
27 Correct 1 ms 256 KB Output is correct
28 Correct 1 ms 256 KB Output is correct
29 Correct 0 ms 384 KB Output is correct
30 Correct 163 ms 12336 KB Output is correct
31 Correct 161 ms 12392 KB Output is correct
32 Correct 126 ms 8128 KB Output is correct
33 Correct 149 ms 12392 KB Output is correct
34 Correct 148 ms 12392 KB Output is correct
35 Correct 151 ms 12336 KB Output is correct
36 Correct 140 ms 12396 KB Output is correct
37 Correct 144 ms 12396 KB Output is correct
38 Correct 143 ms 12392 KB Output is correct
39 Correct 146 ms 12332 KB Output is correct
40 Correct 153 ms 12392 KB Output is correct
41 Correct 161 ms 12336 KB Output is correct
42 Correct 158 ms 12332 KB Output is correct
43 Correct 146 ms 12392 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 256 KB Output is correct
47 Correct 1 ms 256 KB Output is correct
48 Correct 1 ms 384 KB Output is correct
49 Correct 1 ms 384 KB Output is correct
50 Correct 1 ms 256 KB Output is correct
51 Correct 1 ms 384 KB Output is correct
52 Correct 1 ms 256 KB Output is correct
53 Correct 1 ms 256 KB Output is correct
54 Correct 1 ms 384 KB Output is correct
55 Correct 1 ms 384 KB Output is correct
56 Correct 1 ms 256 KB Output is correct
57 Correct 1 ms 384 KB Output is correct
58 Correct 1 ms 384 KB Output is correct
59 Correct 1 ms 384 KB Output is correct
60 Correct 1 ms 256 KB Output is correct
61 Correct 0 ms 256 KB Output is correct
62 Correct 1 ms 384 KB Output is correct
63 Correct 0 ms 384 KB Output is correct
64 Correct 142 ms 12392 KB Output is correct
65 Correct 143 ms 19176 KB Output is correct
66 Correct 144 ms 19176 KB Output is correct
67 Correct 146 ms 19176 KB Output is correct
68 Correct 15 ms 2300 KB Output is correct
69 Correct 14 ms 2300 KB Output is correct
70 Correct 16 ms 2300 KB Output is correct
71 Correct 14 ms 2300 KB Output is correct
72 Correct 15 ms 2300 KB Output is correct
73 Correct 15 ms 2300 KB Output is correct
74 Correct 160 ms 19176 KB Output is correct
75 Correct 159 ms 19176 KB Output is correct
76 Correct 149 ms 19176 KB Output is correct
77 Correct 151 ms 19048 KB Output is correct
78 Correct 145 ms 19176 KB Output is correct
79 Correct 145 ms 19048 KB Output is correct
80 Correct 128 ms 14844 KB Output is correct
81 Correct 147 ms 19176 KB Output is correct
82 Correct 142 ms 19048 KB Output is correct
83 Correct 148 ms 19176 KB Output is correct
84 Correct 143 ms 19176 KB Output is correct
85 Correct 142 ms 19176 KB Output is correct
86 Correct 143 ms 19176 KB Output is correct
87 Correct 161 ms 19116 KB Output is correct
88 Correct 161 ms 19176 KB Output is correct
89 Correct 145 ms 19176 KB Output is correct
90 Correct 144 ms 19176 KB Output is correct
91 Correct 149 ms 19176 KB Output is correct
92 Correct 153 ms 19200 KB Output is correct