Submission #260546

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
260546	2020-08-10T13:57:06 Z	idk321	Arranging Shoes (IOI19_shoes)	Java 11	100 / 100	634 ms	81436 KB

shoes

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;

public class shoes {
	private int[] tree;

	private void add(int from, int to, int a, int b, int node) {
		if (from <= a && b <= to) {
			tree[node]++;
			return;
		}

		int mid = (a + b) / 2;
		if (from <= mid) {
			add(from, to, a, mid, node * 2);
		}
		if (to > mid) {
			add(from, to, mid + 1, b, node * 2 + 1);
		}
	}

	private int getSum(int i, int a, int b, int node) {
		if (a == b) {
			return tree[node];
		}


		int mid = (a + b) / 2;
		if (i <= mid) return getSum(i, a, mid, node * 2) + tree[node];
		return getSum(i, mid + 1, b, node * 2 + 1) + tree[node];
	}

	public long count_swaps(int[] s) {
		int n = s.length;
		ArrayDeque<Integer>[] shoes = new ArrayDeque[2 * n + 1];
		for (int i = 0; i <= 2 * n; i++) shoes[i] = new ArrayDeque<Integer>();

		for (int i = 0; i < n; i++) {
			shoes[s[i] + n].addLast(i);
		}

		tree = new int[4 * n];

		long swaps = 0;
		for (int i = 0; i < n; i++) {
			if (shoes[n + s[i]].isEmpty()  || shoes[n + s[i]].peekFirst() != i) continue;
			//System.out.println(i);
			int index1 = getSum(i, 0, n - 1, 1) + i;
			shoes[n + s[i]].removeFirst();
			int orgIndex2 = shoes[n - s[i]].removeFirst();
			int index2 = getSum(orgIndex2, 0, n - 1, 1) + orgIndex2;
			swaps += index2 - index1;
			if (s[i] < 0) swaps--;
			add(0, orgIndex2, 0, n - 1, 1);
		}

		return swaps;
	}
}

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	81 ms	10316 KB	Output is correct
2	Correct	80 ms	10020 KB	Output is correct

Subtask #2

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	10316 KB	Output is correct
2	Correct	80 ms	10020 KB	Output is correct
3	Correct	88 ms	10092 KB	Output is correct
4	Correct	84 ms	10080 KB	Output is correct
5	Correct	80 ms	10200 KB	Output is correct
6	Correct	91 ms	9948 KB	Output is correct
7	Correct	84 ms	9976 KB	Output is correct
8	Correct	78 ms	10228 KB	Output is correct
9	Correct	85 ms	10040 KB	Output is correct
10	Correct	84 ms	10036 KB	Output is correct
11	Correct	90 ms	10036 KB	Output is correct
12	Correct	100 ms	10200 KB	Output is correct
13	Correct	81 ms	10092 KB	Output is correct
14	Correct	94 ms	10232 KB	Output is correct
15	Correct	101 ms	10192 KB	Output is correct
16	Correct	90 ms	9996 KB	Output is correct
17	Correct	82 ms	10192 KB	Output is correct
18	Correct	82 ms	10084 KB	Output is correct
19	Correct	83 ms	10104 KB	Output is correct
20	Correct	82 ms	10344 KB	Output is correct
21	Correct	104 ms	10172 KB	Output is correct
22	Correct	78 ms	10232 KB	Output is correct
23	Correct	82 ms	10216 KB	Output is correct
24	Correct	76 ms	10232 KB	Output is correct
25	Correct	75 ms	10104 KB	Output is correct
26	Correct	78 ms	10124 KB	Output is correct
27	Correct	75 ms	10088 KB	Output is correct
28	Correct	77 ms	9976 KB	Output is correct
29	Correct	74 ms	10092 KB	Output is correct
30	Correct	74 ms	10020 KB	Output is correct
31	Correct	79 ms	10232 KB	Output is correct
32	Correct	74 ms	10100 KB	Output is correct
33	Correct	83 ms	10356 KB	Output is correct
34	Correct	84 ms	10032 KB	Output is correct
35	Correct	82 ms	10192 KB	Output is correct
36	Correct	78 ms	10088 KB	Output is correct

Subtask #3

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	10316 KB	Output is correct
2	Correct	80 ms	10020 KB	Output is correct
3	Correct	78 ms	10264 KB	Output is correct
4	Correct	75 ms	10088 KB	Output is correct
5	Correct	96 ms	10132 KB	Output is correct
6	Correct	78 ms	10008 KB	Output is correct
7	Correct	77 ms	10216 KB	Output is correct
8	Correct	84 ms	10232 KB	Output is correct
9	Correct	77 ms	10188 KB	Output is correct
10	Correct	74 ms	10232 KB	Output is correct
11	Correct	77 ms	10104 KB	Output is correct
12	Correct	77 ms	10104 KB	Output is correct
13	Correct	83 ms	10216 KB	Output is correct
14	Correct	87 ms	10220 KB	Output is correct
15	Correct	78 ms	10148 KB	Output is correct
16	Correct	83 ms	10104 KB	Output is correct
17	Correct	83 ms	10488 KB	Output is correct
18	Correct	97 ms	11248 KB	Output is correct
19	Correct	92 ms	10856 KB	Output is correct
20	Correct	143 ms	17396 KB	Output is correct
21	Correct	137 ms	16500 KB	Output is correct
22	Correct	431 ms	79796 KB	Output is correct
23	Correct	464 ms	79920 KB	Output is correct
24	Correct	512 ms	80176 KB	Output is correct
25	Correct	539 ms	80324 KB	Output is correct
26	Correct	452 ms	80104 KB	Output is correct
27	Correct	458 ms	80032 KB	Output is correct
28	Correct	451 ms	80648 KB	Output is correct
29	Correct	447 ms	80876 KB	Output is correct
30	Correct	459 ms	81188 KB	Output is correct
31	Correct	437 ms	80052 KB	Output is correct
32	Correct	513 ms	80980 KB	Output is correct
33	Correct	499 ms	80956 KB	Output is correct
34	Correct	479 ms	81324 KB	Output is correct
35	Correct	80 ms	10088 KB	Output is correct
36	Correct	80 ms	10100 KB	Output is correct
37	Correct	429 ms	81004 KB	Output is correct
38	Correct	438 ms	81436 KB	Output is correct
39	Correct	502 ms	81008 KB	Output is correct

Subtask #4

15.0 / 15.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	76 ms	10088 KB	Output is correct
2	Correct	77 ms	10276 KB	Output is correct
3	Correct	78 ms	10232 KB	Output is correct
4	Correct	75 ms	10088 KB	Output is correct
5	Correct	508 ms	80804 KB	Output is correct
6	Correct	454 ms	80616 KB	Output is correct
7	Correct	531 ms	81436 KB	Output is correct
8	Correct	479 ms	81136 KB	Output is correct
9	Correct	523 ms	81392 KB	Output is correct
10	Correct	533 ms	80920 KB	Output is correct

Subtask #5

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	10316 KB	Output is correct
2	Correct	80 ms	10020 KB	Output is correct
3	Correct	88 ms	10092 KB	Output is correct
4	Correct	84 ms	10080 KB	Output is correct
5	Correct	80 ms	10200 KB	Output is correct
6	Correct	91 ms	9948 KB	Output is correct
7	Correct	84 ms	9976 KB	Output is correct
8	Correct	78 ms	10228 KB	Output is correct
9	Correct	85 ms	10040 KB	Output is correct
10	Correct	84 ms	10036 KB	Output is correct
11	Correct	90 ms	10036 KB	Output is correct
12	Correct	100 ms	10200 KB	Output is correct
13	Correct	81 ms	10092 KB	Output is correct
14	Correct	94 ms	10232 KB	Output is correct
15	Correct	101 ms	10192 KB	Output is correct
16	Correct	90 ms	9996 KB	Output is correct
17	Correct	82 ms	10192 KB	Output is correct
18	Correct	82 ms	10084 KB	Output is correct
19	Correct	83 ms	10104 KB	Output is correct
20	Correct	82 ms	10344 KB	Output is correct
21	Correct	104 ms	10172 KB	Output is correct
22	Correct	78 ms	10232 KB	Output is correct
23	Correct	82 ms	10216 KB	Output is correct
24	Correct	76 ms	10232 KB	Output is correct
25	Correct	75 ms	10104 KB	Output is correct
26	Correct	78 ms	10124 KB	Output is correct
27	Correct	75 ms	10088 KB	Output is correct
28	Correct	77 ms	9976 KB	Output is correct
29	Correct	74 ms	10092 KB	Output is correct
30	Correct	74 ms	10020 KB	Output is correct
31	Correct	79 ms	10232 KB	Output is correct
32	Correct	74 ms	10100 KB	Output is correct
33	Correct	83 ms	10356 KB	Output is correct
34	Correct	84 ms	10032 KB	Output is correct
35	Correct	82 ms	10192 KB	Output is correct
36	Correct	78 ms	10088 KB	Output is correct
37	Correct	81 ms	10092 KB	Output is correct
38	Correct	90 ms	10088 KB	Output is correct
39	Correct	80 ms	10304 KB	Output is correct
40	Correct	88 ms	10664 KB	Output is correct
41	Correct	98 ms	11264 KB	Output is correct
42	Correct	98 ms	11548 KB	Output is correct
43	Correct	94 ms	10980 KB	Output is correct
44	Correct	102 ms	11356 KB	Output is correct
45	Correct	105 ms	10848 KB	Output is correct
46	Correct	106 ms	11388 KB	Output is correct
47	Correct	97 ms	10852 KB	Output is correct
48	Correct	104 ms	11596 KB	Output is correct
49	Correct	101 ms	11368 KB	Output is correct
50	Correct	99 ms	11368 KB	Output is correct
51	Correct	94 ms	10872 KB	Output is correct
52	Correct	102 ms	11412 KB	Output is correct

Subtask #6

15.0 / 15.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	81 ms	10316 KB	Output is correct
2	Correct	80 ms	10020 KB	Output is correct
3	Correct	88 ms	10092 KB	Output is correct
4	Correct	84 ms	10080 KB	Output is correct
5	Correct	80 ms	10200 KB	Output is correct
6	Correct	91 ms	9948 KB	Output is correct
7	Correct	84 ms	9976 KB	Output is correct
8	Correct	78 ms	10228 KB	Output is correct
9	Correct	85 ms	10040 KB	Output is correct
10	Correct	84 ms	10036 KB	Output is correct
11	Correct	90 ms	10036 KB	Output is correct
12	Correct	100 ms	10200 KB	Output is correct
13	Correct	81 ms	10092 KB	Output is correct
14	Correct	94 ms	10232 KB	Output is correct
15	Correct	101 ms	10192 KB	Output is correct
16	Correct	90 ms	9996 KB	Output is correct
17	Correct	82 ms	10192 KB	Output is correct
18	Correct	82 ms	10084 KB	Output is correct
19	Correct	83 ms	10104 KB	Output is correct
20	Correct	82 ms	10344 KB	Output is correct
21	Correct	104 ms	10172 KB	Output is correct
22	Correct	78 ms	10232 KB	Output is correct
23	Correct	82 ms	10216 KB	Output is correct
24	Correct	76 ms	10232 KB	Output is correct
25	Correct	75 ms	10104 KB	Output is correct
26	Correct	78 ms	10124 KB	Output is correct
27	Correct	75 ms	10088 KB	Output is correct
28	Correct	77 ms	9976 KB	Output is correct
29	Correct	74 ms	10092 KB	Output is correct
30	Correct	74 ms	10020 KB	Output is correct
31	Correct	79 ms	10232 KB	Output is correct
32	Correct	74 ms	10100 KB	Output is correct
33	Correct	83 ms	10356 KB	Output is correct
34	Correct	84 ms	10032 KB	Output is correct
35	Correct	82 ms	10192 KB	Output is correct
36	Correct	78 ms	10088 KB	Output is correct
37	Correct	78 ms	10264 KB	Output is correct
38	Correct	75 ms	10088 KB	Output is correct
39	Correct	96 ms	10132 KB	Output is correct
40	Correct	78 ms	10008 KB	Output is correct
41	Correct	77 ms	10216 KB	Output is correct
42	Correct	84 ms	10232 KB	Output is correct
43	Correct	77 ms	10188 KB	Output is correct
44	Correct	74 ms	10232 KB	Output is correct
45	Correct	77 ms	10104 KB	Output is correct
46	Correct	77 ms	10104 KB	Output is correct
47	Correct	83 ms	10216 KB	Output is correct
48	Correct	87 ms	10220 KB	Output is correct
49	Correct	78 ms	10148 KB	Output is correct
50	Correct	83 ms	10104 KB	Output is correct
51	Correct	83 ms	10488 KB	Output is correct
52	Correct	97 ms	11248 KB	Output is correct
53	Correct	92 ms	10856 KB	Output is correct
54	Correct	143 ms	17396 KB	Output is correct
55	Correct	137 ms	16500 KB	Output is correct
56	Correct	431 ms	79796 KB	Output is correct
57	Correct	464 ms	79920 KB	Output is correct
58	Correct	512 ms	80176 KB	Output is correct
59	Correct	539 ms	80324 KB	Output is correct
60	Correct	452 ms	80104 KB	Output is correct
61	Correct	458 ms	80032 KB	Output is correct
62	Correct	451 ms	80648 KB	Output is correct
63	Correct	447 ms	80876 KB	Output is correct
64	Correct	459 ms	81188 KB	Output is correct
65	Correct	437 ms	80052 KB	Output is correct
66	Correct	513 ms	80980 KB	Output is correct
67	Correct	499 ms	80956 KB	Output is correct
68	Correct	479 ms	81324 KB	Output is correct
69	Correct	80 ms	10088 KB	Output is correct
70	Correct	80 ms	10100 KB	Output is correct
71	Correct	429 ms	81004 KB	Output is correct
72	Correct	438 ms	81436 KB	Output is correct
73	Correct	502 ms	81008 KB	Output is correct
74	Correct	76 ms	10088 KB	Output is correct
75	Correct	77 ms	10276 KB	Output is correct
76	Correct	78 ms	10232 KB	Output is correct
77	Correct	75 ms	10088 KB	Output is correct
78	Correct	508 ms	80804 KB	Output is correct
79	Correct	454 ms	80616 KB	Output is correct
80	Correct	531 ms	81436 KB	Output is correct
81	Correct	479 ms	81136 KB	Output is correct
82	Correct	523 ms	81392 KB	Output is correct
83	Correct	533 ms	80920 KB	Output is correct
84	Correct	81 ms	10092 KB	Output is correct
85	Correct	90 ms	10088 KB	Output is correct
86	Correct	80 ms	10304 KB	Output is correct
87	Correct	88 ms	10664 KB	Output is correct
88	Correct	98 ms	11264 KB	Output is correct
89	Correct	98 ms	11548 KB	Output is correct
90	Correct	94 ms	10980 KB	Output is correct
91	Correct	102 ms	11356 KB	Output is correct
92	Correct	105 ms	10848 KB	Output is correct
93	Correct	106 ms	11388 KB	Output is correct
94	Correct	97 ms	10852 KB	Output is correct
95	Correct	104 ms	11596 KB	Output is correct
96	Correct	101 ms	11368 KB	Output is correct
97	Correct	99 ms	11368 KB	Output is correct
98	Correct	94 ms	10872 KB	Output is correct
99	Correct	102 ms	11412 KB	Output is correct
100	Correct	94 ms	10848 KB	Output is correct
101	Correct	144 ms	16480 KB	Output is correct
102	Correct	150 ms	16248 KB	Output is correct
103	Correct	537 ms	79792 KB	Output is correct
104	Correct	506 ms	80052 KB	Output is correct
105	Correct	481 ms	79812 KB	Output is correct
106	Correct	533 ms	80792 KB	Output is correct
107	Correct	475 ms	80020 KB	Output is correct
108	Correct	547 ms	80052 KB	Output is correct
109	Correct	540 ms	80736 KB	Output is correct
110	Correct	576 ms	80444 KB	Output is correct
111	Correct	538 ms	81136 KB	Output is correct
112	Correct	460 ms	80512 KB	Output is correct
113	Correct	634 ms	81260 KB	Output is correct
114	Correct	517 ms	80816 KB	Output is correct
115	Correct	540 ms	81044 KB	Output is correct