oj.uz

Submission #152576

# Submission time Handle Problem Language Result Execution time Memory
152576 2019-09-08T13:29:08 Z Myldero Arranging Shoes (IOI19_shoes) Java 11
100 / 100
 409 ms 36380 KB 
import java.io.*;
import java.util.*;
import java.math.*;

class shoes {

    int[] s;
    int n, m;

    int[] positions, pairs;
    boolean[] visited;
    Fenwick tree;

    public long count_swaps(int[] S) {
        s = S;
        m = s.length;
        n = m / 2;

        positions = new int[m];
        pairs = new int[m];
        visited = new boolean[m];

        tree = new Fenwick(m);
        for (int i = 1; i <= m; i++) {
            tree.update(i, 1);
        }

        matchPairs();

        long sum = 0;

        for (int i = m-1; i >= 1; i--) {
            if (visited[i]) continue;
            int a = pairs[i];
            int posA = tree.get(a+1);
            int posB = tree.get(i+1);

            sum += posB - posA - 1;
            tree.update(a+1, -1);

            visited[a] = true;

            if (s[a] > s[i]) sum++;
        }

        return sum;
    }

    void matchPairs () {
        ArrayList<Integer>[] a = new ArrayList[n+1];
        ArrayList<Integer>[] b = new ArrayList[n+1];
        for (int i = 1; i <= n; i++) {
            a[i] = new ArrayList<Integer>();
            b[i] = new ArrayList<Integer>();
        }

        for (int i = 0; i < m; i++) {
            if (s[i] < 0) {
                a[-s[i]].add(i);
            } else {
                b[s[i]].add(i);
            }
        }

        for (int i = 1; i <= n; i++) {
            for (int j = 0; j < a[i].size(); j++) {
                pairs[a[i].get(j)] = b[i].get(j);
                pairs[b[i].get(j)] = a[i].get(j);
            }
        }

    }
}

class Fenwick {
    int n;
    int[] arr;

    public Fenwick (int n) {
        this.n = n;
        arr = new int[n+1];
    }

    public int lsb (int a) {
        return a & -a;
    }

    public void update (int idx, int value) {
        while (idx <= n) {
            arr[idx] += value;
            idx += lsb(idx);
        }
    }

    public int get (int idx) {
        int sum = 0;

        while (idx > 0) {
            sum += arr[idx];
            idx -= lsb(idx);
        }
        return sum;
    }

}

Compilation message

Note: shoes.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 9596 KB Output is correct
2 Correct 87 ms 9692 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 9596 KB Output is correct
2 Correct 87 ms 9692 KB Output is correct
3 Correct 86 ms 9464 KB Output is correct
4 Correct 87 ms 9588 KB Output is correct
5 Correct 93 ms 9728 KB Output is correct
6 Correct 89 ms 9608 KB Output is correct
7 Correct 88 ms 9480 KB Output is correct
8 Correct 96 ms 9708 KB Output is correct
9 Correct 94 ms 9672 KB Output is correct
10 Correct 107 ms 9732 KB Output is correct
11 Correct 91 ms 9620 KB Output is correct
12 Correct 94 ms 9744 KB Output is correct
13 Correct 87 ms 9600 KB Output is correct
14 Correct 88 ms 9392 KB Output is correct
15 Correct 95 ms 9368 KB Output is correct
16 Correct 88 ms 9884 KB Output is correct
17 Correct 85 ms 9588 KB Output is correct
18 Correct 88 ms 9760 KB Output is correct
19 Correct 85 ms 9628 KB Output is correct
20 Correct 86 ms 9740 KB Output is correct
21 Correct 86 ms 9732 KB Output is correct
22 Correct 88 ms 9572 KB Output is correct
23 Correct 88 ms 9640 KB Output is correct
24 Correct 86 ms 9540 KB Output is correct
25 Correct 89 ms 9652 KB Output is correct
26 Correct 87 ms 9720 KB Output is correct
27 Correct 85 ms 9640 KB Output is correct
28 Correct 91 ms 9740 KB Output is correct
29 Correct 85 ms 9532 KB Output is correct
30 Correct 88 ms 9536 KB Output is correct
31 Correct 88 ms 9492 KB Output is correct
32 Correct 90 ms 9584 KB Output is correct
33 Correct 88 ms 9668 KB Output is correct
34 Correct 91 ms 9756 KB Output is correct
35 Correct 87 ms 9704 KB Output is correct
36 Correct 91 ms 9736 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 9596 KB Output is correct
2 Correct 87 ms 9692 KB Output is correct
3 Correct 92 ms 9572 KB Output is correct
4 Correct 88 ms 9580 KB Output is correct
5 Correct 87 ms 9588 KB Output is correct
6 Correct 88 ms 9540 KB Output is correct
7 Correct 89 ms 9540 KB Output is correct
8 Correct 94 ms 9632 KB Output is correct
9 Correct 94 ms 9480 KB Output is correct
10 Correct 91 ms 9612 KB Output is correct
11 Correct 87 ms 9412 KB Output is correct
12 Correct 88 ms 9584 KB Output is correct
13 Correct 88 ms 9508 KB Output is correct
14 Correct 87 ms 9724 KB Output is correct
15 Correct 86 ms 9612 KB Output is correct
16 Correct 90 ms 9744 KB Output is correct
17 Correct 93 ms 9708 KB Output is correct
18 Correct 100 ms 9928 KB Output is correct
19 Correct 101 ms 9832 KB Output is correct
20 Correct 134 ms 12288 KB Output is correct
21 Correct 140 ms 12268 KB Output is correct
22 Correct 299 ms 27124 KB Output is correct
23 Correct 262 ms 27308 KB Output is correct
24 Correct 284 ms 27248 KB Output is correct
25 Correct 287 ms 27360 KB Output is correct
26 Correct 266 ms 27124 KB Output is correct
27 Correct 250 ms 26896 KB Output is correct
28 Correct 282 ms 27892 KB Output is correct
29 Correct 307 ms 27512 KB Output is correct
30 Correct 286 ms 27872 KB Output is correct
31 Correct 257 ms 27108 KB Output is correct
32 Correct 299 ms 27844 KB Output is correct
33 Correct 297 ms 27524 KB Output is correct
34 Correct 320 ms 27872 KB Output is correct
35 Correct 84 ms 9620 KB Output is correct
36 Correct 88 ms 9556 KB Output is correct
37 Correct 293 ms 27932 KB Output is correct
38 Correct 277 ms 27544 KB Output is correct
39 Correct 289 ms 27812 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 9600 KB Output is correct
2 Correct 88 ms 9608 KB Output is correct
3 Correct 87 ms 9696 KB Output is correct
4 Correct 87 ms 9584 KB Output is correct
5 Correct 375 ms 36048 KB Output is correct
6 Correct 319 ms 27712 KB Output is correct
7 Correct 400 ms 36324 KB Output is correct
8 Correct 291 ms 28168 KB Output is correct
9 Correct 383 ms 36220 KB Output is correct
10 Correct 345 ms 30900 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 9596 KB Output is correct
2 Correct 87 ms 9692 KB Output is correct
3 Correct 86 ms 9464 KB Output is correct
4 Correct 87 ms 9588 KB Output is correct
5 Correct 93 ms 9728 KB Output is correct
6 Correct 89 ms 9608 KB Output is correct
7 Correct 88 ms 9480 KB Output is correct
8 Correct 96 ms 9708 KB Output is correct
9 Correct 94 ms 9672 KB Output is correct
10 Correct 107 ms 9732 KB Output is correct
11 Correct 91 ms 9620 KB Output is correct
12 Correct 94 ms 9744 KB Output is correct
13 Correct 87 ms 9600 KB Output is correct
14 Correct 88 ms 9392 KB Output is correct
15 Correct 95 ms 9368 KB Output is correct
16 Correct 88 ms 9884 KB Output is correct
17 Correct 85 ms 9588 KB Output is correct
18 Correct 88 ms 9760 KB Output is correct
19 Correct 85 ms 9628 KB Output is correct
20 Correct 86 ms 9740 KB Output is correct
21 Correct 86 ms 9732 KB Output is correct
22 Correct 88 ms 9572 KB Output is correct
23 Correct 88 ms 9640 KB Output is correct
24 Correct 86 ms 9540 KB Output is correct
25 Correct 89 ms 9652 KB Output is correct
26 Correct 87 ms 9720 KB Output is correct
27 Correct 85 ms 9640 KB Output is correct
28 Correct 91 ms 9740 KB Output is correct
29 Correct 85 ms 9532 KB Output is correct
30 Correct 88 ms 9536 KB Output is correct
31 Correct 88 ms 9492 KB Output is correct
32 Correct 90 ms 9584 KB Output is correct
33 Correct 88 ms 9668 KB Output is correct
34 Correct 91 ms 9756 KB Output is correct
35 Correct 87 ms 9704 KB Output is correct
36 Correct 91 ms 9736 KB Output is correct
37 Correct 87 ms 9636 KB Output is correct
38 Correct 87 ms 9792 KB Output is correct
39 Correct 93 ms 9636 KB Output is correct
40 Correct 108 ms 9700 KB Output is correct
41 Correct 106 ms 9860 KB Output is correct
42 Correct 102 ms 10136 KB Output is correct
43 Correct 106 ms 10144 KB Output is correct
44 Correct 103 ms 10004 KB Output is correct
45 Correct 108 ms 9876 KB Output is correct
46 Correct 103 ms 10192 KB Output is correct
47 Correct 101 ms 9848 KB Output is correct
48 Correct 99 ms 9896 KB Output is correct
49 Correct 106 ms 10152 KB Output is correct
50 Correct 101 ms 10044 KB Output is correct
51 Correct 99 ms 9944 KB Output is correct
52 Correct 103 ms 10140 KB Output is correct

Subtask #6
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 9596 KB Output is correct
2 Correct 87 ms 9692 KB Output is correct
3 Correct 86 ms 9464 KB Output is correct
4 Correct 87 ms 9588 KB Output is correct
5 Correct 93 ms 9728 KB Output is correct
6 Correct 89 ms 9608 KB Output is correct
7 Correct 88 ms 9480 KB Output is correct
8 Correct 96 ms 9708 KB Output is correct
9 Correct 94 ms 9672 KB Output is correct
10 Correct 107 ms 9732 KB Output is correct
11 Correct 91 ms 9620 KB Output is correct
12 Correct 94 ms 9744 KB Output is correct
13 Correct 87 ms 9600 KB Output is correct
14 Correct 88 ms 9392 KB Output is correct
15 Correct 95 ms 9368 KB Output is correct
16 Correct 88 ms 9884 KB Output is correct
17 Correct 85 ms 9588 KB Output is correct
18 Correct 88 ms 9760 KB Output is correct
19 Correct 85 ms 9628 KB Output is correct
20 Correct 86 ms 9740 KB Output is correct
21 Correct 86 ms 9732 KB Output is correct
22 Correct 88 ms 9572 KB Output is correct
23 Correct 88 ms 9640 KB Output is correct
24 Correct 86 ms 9540 KB Output is correct
25 Correct 89 ms 9652 KB Output is correct
26 Correct 87 ms 9720 KB Output is correct
27 Correct 85 ms 9640 KB Output is correct
28 Correct 91 ms 9740 KB Output is correct
29 Correct 85 ms 9532 KB Output is correct
30 Correct 88 ms 9536 KB Output is correct
31 Correct 88 ms 9492 KB Output is correct
32 Correct 90 ms 9584 KB Output is correct
33 Correct 88 ms 9668 KB Output is correct
34 Correct 91 ms 9756 KB Output is correct
35 Correct 87 ms 9704 KB Output is correct
36 Correct 91 ms 9736 KB Output is correct
37 Correct 92 ms 9572 KB Output is correct
38 Correct 88 ms 9580 KB Output is correct
39 Correct 87 ms 9588 KB Output is correct
40 Correct 88 ms 9540 KB Output is correct
41 Correct 89 ms 9540 KB Output is correct
42 Correct 94 ms 9632 KB Output is correct
43 Correct 94 ms 9480 KB Output is correct
44 Correct 91 ms 9612 KB Output is correct
45 Correct 87 ms 9412 KB Output is correct
46 Correct 88 ms 9584 KB Output is correct
47 Correct 88 ms 9508 KB Output is correct
48 Correct 87 ms 9724 KB Output is correct
49 Correct 86 ms 9612 KB Output is correct
50 Correct 90 ms 9744 KB Output is correct
51 Correct 93 ms 9708 KB Output is correct
52 Correct 100 ms 9928 KB Output is correct
53 Correct 101 ms 9832 KB Output is correct
54 Correct 134 ms 12288 KB Output is correct
55 Correct 140 ms 12268 KB Output is correct
56 Correct 299 ms 27124 KB Output is correct
57 Correct 262 ms 27308 KB Output is correct
58 Correct 284 ms 27248 KB Output is correct
59 Correct 287 ms 27360 KB Output is correct
60 Correct 266 ms 27124 KB Output is correct
61 Correct 250 ms 26896 KB Output is correct
62 Correct 282 ms 27892 KB Output is correct
63 Correct 307 ms 27512 KB Output is correct
64 Correct 286 ms 27872 KB Output is correct
65 Correct 257 ms 27108 KB Output is correct
66 Correct 299 ms 27844 KB Output is correct
67 Correct 297 ms 27524 KB Output is correct
68 Correct 320 ms 27872 KB Output is correct
69 Correct 84 ms 9620 KB Output is correct
70 Correct 88 ms 9556 KB Output is correct
71 Correct 293 ms 27932 KB Output is correct
72 Correct 277 ms 27544 KB Output is correct
73 Correct 289 ms 27812 KB Output is correct
74 Correct 87 ms 9600 KB Output is correct
75 Correct 88 ms 9608 KB Output is correct
76 Correct 87 ms 9696 KB Output is correct
77 Correct 87 ms 9584 KB Output is correct
78 Correct 375 ms 36048 KB Output is correct
79 Correct 319 ms 27712 KB Output is correct
80 Correct 400 ms 36324 KB Output is correct
81 Correct 291 ms 28168 KB Output is correct
82 Correct 383 ms 36220 KB Output is correct
83 Correct 345 ms 30900 KB Output is correct
84 Correct 87 ms 9636 KB Output is correct
85 Correct 87 ms 9792 KB Output is correct
86 Correct 93 ms 9636 KB Output is correct
87 Correct 108 ms 9700 KB Output is correct
88 Correct 106 ms 9860 KB Output is correct
89 Correct 102 ms 10136 KB Output is correct
90 Correct 106 ms 10144 KB Output is correct
91 Correct 103 ms 10004 KB Output is correct
92 Correct 108 ms 9876 KB Output is correct
93 Correct 103 ms 10192 KB Output is correct
94 Correct 101 ms 9848 KB Output is correct
95 Correct 99 ms 9896 KB Output is correct
96 Correct 106 ms 10152 KB Output is correct
97 Correct 101 ms 10044 KB Output is correct
98 Correct 99 ms 9944 KB Output is correct
99 Correct 103 ms 10140 KB Output is correct
100 Correct 107 ms 10248 KB Output is correct
101 Correct 157 ms 13020 KB Output is correct
102 Correct 152 ms 12100 KB Output is correct
103 Correct 409 ms 35576 KB Output is correct
104 Correct 323 ms 35960 KB Output is correct
105 Correct 339 ms 31172 KB Output is correct
106 Correct 360 ms 36168 KB Output is correct
107 Correct 303 ms 27100 KB Output is correct
108 Correct 295 ms 27784 KB Output is correct
109 Correct 286 ms 27976 KB Output is correct
110 Correct 283 ms 27592 KB Output is correct
111 Correct 353 ms 35008 KB Output is correct
112 Correct 334 ms 33048 KB Output is correct
113 Correct 338 ms 27800 KB Output is correct
114 Correct 383 ms 36380 KB Output is correct
115 Correct 360 ms 36076 KB Output is correct