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Datatähti 2024 alku

Käännöt

  • Start: 2023-10-30 00:00:00
  • End: 2023-11-13 00:00:00
CSES - Datatähti 2024 alku - Results
Submission details
Task:Käännöt
Sender:andreibe
Submission time:2023-11-06 20:01:32 +0200
Language:Java
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED13
#2ACCEPTED19
#3ACCEPTED33
#4ACCEPTED35
Test results
testverdicttimegroup
#1ACCEPTED0.13 s1details
#2ACCEPTED0.13 s1details
#3ACCEPTED0.13 s1details
#4ACCEPTED0.14 s1details
#5ACCEPTED0.15 s1details
#6ACCEPTED0.13 s2details
#7ACCEPTED0.13 s2details
#8ACCEPTED0.13 s2details
#9ACCEPTED0.13 s2details
#10ACCEPTED0.13 s2details
#11ACCEPTED0.20 s2details
#12ACCEPTED0.20 s2details
#13ACCEPTED0.20 s2details
#14ACCEPTED0.20 s2details
#15ACCEPTED0.16 s2details
#16ACCEPTED0.22 s2details
#17ACCEPTED0.13 s3details
#18ACCEPTED0.13 s3details
#19ACCEPTED0.20 s3details
#20ACCEPTED0.20 s3details
#21ACCEPTED0.21 s3details
#22ACCEPTED0.21 s3details
#23ACCEPTED0.21 s3details
#24ACCEPTED0.87 s3details
#25ACCEPTED0.23 s3details
#26ACCEPTED0.13 s4details
#27ACCEPTED0.13 s4details
#28ACCEPTED0.20 s4details
#29ACCEPTED0.20 s4details
#30ACCEPTED0.18 s4details
#31ACCEPTED0.20 s4details
#32ACCEPTED0.14 s4details
#33ACCEPTED0.23 s4details
#34ACCEPTED0.23 s4details

Code

import java.util.*;

public class Main {
    private static boolean isSorted(int[] ar) {
        for (int i = 0; i < ar.length - 1; i++) {
            if (ar[i] < ar[i + 1]) {
                continue;
            }
            return false;
        }
        return true;
    }
    private static class TestCase {
        public int n;
        public int k;
        public int[] ar;

        public TestCase(int n, int k, int[] ar) {
            this.n = n;
            this.k = k;
            this.ar = ar;
        }
    }
    private static void swap(int y, int x, int[] ar) {
        int temp = ar[y];
        ar[y] = ar[x];
        ar[x] = temp;
    }
    private static void swapLoc(int y, int x, int[] ar, HashMap<Integer, Integer> locations, boolean log) {
        int temp = ar[y];
        ar[y] = ar[x];
        locations.put(ar[x], y);
        ar[x] = temp;
        locations.put(temp, x);
        if (log) operations.add(y+1);
    }

    private static TestCase createTestCase(int k) {
        int n = k * 100;
        int[] ar = new int[n];
        for (int i = 0; i < ar.length; i++) {
            ar[i] = i+1;
        }
        Random random = new Random();
        for (int i = 0; i < 200; i++) {
            int startIndex = random.nextInt(n-k);
            if (k == 4) {
                swap(startIndex, startIndex+3,ar);
                swap(startIndex+1, startIndex+2,ar);
            }
            if (k == 5) {
                swap(startIndex, startIndex+4, ar);
                swap(startIndex+1, startIndex+3, ar);
            }
        }
        //shuffleArray(ar);
        return new TestCase(n,k,ar);
    }
    static boolean tryStupidAlgorithmK5(TestCase testCase, boolean logOperations) {
        int[] ar = testCase.ar;
        HashMap<Integer, Integer> location = new HashMap<>();
        int min = 1000;
        for (int j : ar) {
            min = Math.min(min, j);
        }
        for (int i = 0; i < ar.length; i++) {
            ar[i] = ar[i] - min + 1;
            location.put(ar[i], i);
        }
        for (int number = 1; number <= ar.length; number++) {
            int locationNow = location.get(number);
            int locationShouldBe = number - 1;
            if (locationNow == locationShouldBe) continue;
            locationShouldBe += 4;
            boolean exit = false;
            while (locationNow < locationShouldBe) {
                if (locationShouldBe >= ar.length || locationNow + 4 >= ar.length) {
                    exit = true;
                    break;
                }
                //moving right
                swapLoc(locationNow, locationNow+4, ar, location, logOperations);
                swapLoc(locationNow+1, locationNow+3, ar, location, false);

                locationNow = locationNow + 4;
            }
            if (exit) continue;
            exit = false;
            while (locationNow > locationShouldBe) {
                int diff = locationNow - locationShouldBe;
                if (diff >= 4) {
                    swapLoc(locationNow-4, locationNow, ar, location, logOperations);
                    swapLoc(locationNow-3, locationNow-1, ar, location, false);
                    locationNow -= 4;
                }
                else {
                    //TODO this
                    if (locationNow + 1 >= ar.length) {
                        exit = true;
                        break;
                    }
                    swapLoc(locationNow-3, locationNow+1, ar, location, logOperations);
                    swapLoc(locationNow-2, locationNow, ar, location, false);
                    locationNow -= 2;
                }
            }
            if (!exit && locationNow != locationShouldBe) {
                System.out.println("NO\n");
                System.exit(0);
            }
            swapLoc(locationNow-4, locationNow, ar, location, logOperations);
            swapLoc(locationNow-3, locationNow-1, ar, location, false);
        }
        return isSorted(ar);
    }
    static boolean tryStupidAlgorithmK4(TestCase testCase, boolean logOperations) {
        int[] ar = testCase.ar;

        HashMap<Integer, Integer> location = new HashMap<>();
        int min = 1000;
        for (int j : ar) {
            min = Math.min(min, j);
        }
        for (int i = 0; i < ar.length; i++) {
            ar[i] = ar[i] - min + 1;
            location.put(ar[i], i);
        }
        //System.out.println("After: 0 " + Arrays.toString(ar));
        for (int number = 1; number <= ar.length; number++) {
            int locationNow = location.get(number);
            int locationShouldBe = number - 1;
            //System.out.println("Location of " + number + ": " + locationNow + ". Should be " + locationShouldBe);
            if (locationNow == locationShouldBe) continue;

            locationShouldBe += 3;
            boolean exit = false;
            while (locationNow < locationShouldBe) {
                if (locationShouldBe >= ar.length || locationNow + 3 >= ar.length) {
                    exit = true;
                    break;
                }
                //moving right
                swapLoc(locationNow, locationNow+3, ar, location, logOperations);
                swapLoc(locationNow+1, locationNow+2, ar, location, false);

                locationNow = locationNow + 3;
            }
            if (exit) continue;
            while (locationNow > locationShouldBe) {
                int diff = locationNow - locationShouldBe;
                if (diff >= 3) {
                    swapLoc(locationNow-3, locationNow, ar, location, logOperations);
                    swapLoc(locationNow-2, locationNow-1, ar, location, false);
                    locationNow -= 3;
                }
                else {
                    if (locationNow + 1 >= ar.length) break;
                    swapLoc(locationNow-2, locationNow+1, ar, location, logOperations);
                    swapLoc(locationNow-1, locationNow, ar, location, false);
                    locationNow -= 1;
                }
            }
            swapLoc(locationNow-3, locationNow, ar, location, logOperations);
            swapLoc(locationNow-2, locationNow-1, ar, location, false);

            //System.out.println("After: " + number + " " + Arrays.toString(ar));
        }
        return isSorted(ar);
    }
    static int[] copy;

    static ArrayList<Integer> operations = new ArrayList<>();

    private static void shuffleArray(int[] array) {
        int index;
        Random random = new Random();
        for (int i = array.length - 1; i > 0; i--)
        {
            index = random.nextInt(i + 1);
            if (index != i)
            {
                array[index] ^= array[i];
                array[i] ^= array[index];
                array[index] ^= array[i];
            }
        }
    }

    public static void runTestCases() {
        for (int i = 0; i < 100; i++) {
            TestCase testCase = createTestCase(5);
            int[] original = new int[testCase.ar.length];
            System.arraycopy(testCase.ar, 0, original, 0, original.length);

            operations.clear();
            boolean result = test(testCase);

            StringBuilder builder = new StringBuilder();
            if (result) {
                checkResult(original, operations, testCase.k);
                System.out.println(true);

            } else {
                System.out.println(Arrays.toString(original));
                System.out.println(false);
                builder.append("NO\n");
            }
            //System.out.println(builder);
        }
    }
    private static long startTime = 0;


    public static void main(String[] args) {
        startTime = System.currentTimeMillis();

        TestCase testCase;
        if (args.length > 0 && args[0].equals("debug")) {
            testCase = createTestCase(5);
        } else {
            Scanner scanner = new Scanner(Objects.requireNonNull(Main.class.getResourceAsStream("/input.txt")));
            String[] line = scanner.nextLine().split(" ");
            int n = Integer.parseInt(line[0]);
            int k = Integer.parseInt(line[1]);
            int[] ar = new int[n];
            line = scanner.nextLine().split(" ");
            for (int i = 0; i < ar.length; i++) {
                ar[i] = Integer.parseInt(line[i]);
            }
            testCase = new TestCase(n,k,ar);
        }
        int k = testCase.k;
        int[] ar = testCase.ar;
        int[] original = new int[ar.length];
        System.arraycopy(ar, 0, original, 0, original.length);
        //tryStupidAlgorithmK4(testCase, false);
        //System.exit(0);

        boolean result = false;
        if (k == 4 || k == 5) {
            result = test(testCase);
        }
        if (k == 2) {
            //bubble sort
            while (true) {
                boolean changes = false;
                for (int i = 0; i < ar.length -1; i++) {
                    if (ar[i] > ar[i+1]) {
                        int temp = ar[i];
                        operations.add(i+1);
                        ar[i] = ar[i+1];
                        ar[i+1] = temp;
                        changes = true;
                    }
                }
                if (!changes) break;
            }
            result = true;
        }
        if (k == 3) {
            while (true) {
                boolean changes = false;
                for (int i = 0; i < ar.length-2; i++) {
                    if (ar[i] > ar[i+2]) {
                        int temp = ar[i];
                        operations.add(i+1);
                        ar[i] = ar[i+2];
                        ar[i+2] = temp;
                        changes = true;
                    }
                }
                if (!changes) break;
            }
            result = isSorted(ar);
        }



        StringBuilder builder = new StringBuilder();
        if (result) {
            builder.append("YES\n");

            builder.append(operations.size()).append("\n");
            //checkResult(original, operations, testCase.k);

            for (Integer operation : operations) {
                builder.append(operation).append(" ");
            }


        } else {
            builder.append("NO\n");
        }
        System.out.println(builder);
        //System.out.println("Took: " + (System.currentTimeMillis() - startTime));
    }

    private static void checkResult(int[] original, ArrayList<Integer> operations, int k) {
        for (int operation : operations) {
            operation--;
            if (k == 4) {
                swap(operation, operation+3, original);
                swap(operation+1, operation+2, original);
            }
            if (k == 5) {
                swap(operation, operation+4, original);
                swap(operation+1, operation+3, original);
            }
        }
        if (!isSorted(original)) {
            throw new IllegalArgumentException("Not sorted " + Arrays.toString(original));
        }
    }

    static boolean test(TestCase start) {
        if (start.n > start.k * 8) {
            //System.out.println("WHAT?");
            //sort most of array
            if (start.k == 4) {
                tryStupidAlgorithmK4(start, true);
            } else {
                tryStupidAlgorithmK5(start, true);
            }

            //System.out.println("After stupid: " +Arrays.toString(start.ar));

            int[] ar = start.ar;
            //sort the last k*8 elements separately
            int[] smallerAr = new int[start.k * 8];
            for (int i = 0; i < smallerAr.length; i++) {
                smallerAr[i] = ar[ar.length - smallerAr.length + i];
            }
            ArrayList<Integer> operationsCopy = new ArrayList<>(operations);
            operations.clear();
            //System.out.println("Mid time: " + (System.currentTimeMillis()- startTime) +" operations: " + operationsCopy.size());
            boolean b = test(new TestCase(smallerAr.length, start.k, smallerAr));
            if (b) {
                //System.out.println("SUCCESS!");
                //System.out.println(operations);
                for (int operation : operations) {
                    operation += (ar.length - smallerAr.length);
                    operationsCopy.add(operation);
                }
            }
            operations = operationsCopy;

            return b;
        }
        copy = new int[start.ar.length];
        Random random = new Random();
        while ((System.currentTimeMillis() - startTime) < 800) {
            int randomIndex = random.nextInt(start.ar.length+1 - start.k);
            operations.add(randomIndex+1);

            if (start.k == 4) {
                swap(randomIndex, randomIndex+3, start.ar);
                swap(randomIndex+1, randomIndex+2, start.ar);
            }
            if (start.k == 5) {
                swap(randomIndex, randomIndex+4, start.ar);
                swap(randomIndex+1, randomIndex+3, start.ar);
            }


            System.arraycopy(start.ar, 0, copy, 0, start.ar.length);
            boolean res;
            if (start.k == 4) {
                res = tryStupidAlgorithmK4(new TestCase(start.n, start.k, copy), false);
            } else {
                res = tryStupidAlgorithmK5(new TestCase(start.n, start.k, copy), false);
            }
            if (res) {
                //System.out.println("Omg is sorted?");
                System.arraycopy(start.ar, 0, copy, 0, start.ar.length);
                if (start.k == 4) {
                    tryStupidAlgorithmK4(new TestCase(start.n, start.k, copy), true);
                } else {
                    tryStupidAlgorithmK5(new TestCase(start.n, start.k, copy), true);
                }
                break;
            }
        }
        return isSorted(copy);
        //System.out.println(builder);
        //System.out.println(System.currentTimeMillis() - startTime);
        //System.out.println(operations.size());
    }
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
5 2
1 2 3 4 5
view save

correct output
YES
0
view save

user output
YES
0
view save

Test 2

Group: 1

Verdict: ACCEPTED

input
5 2
2 1 3 4 5
view save

correct output
YES
1
1
view save

user output
YES
1
1 
view save

Test 3

Group: 1

Verdict: ACCEPTED

input
20 2
6 20 18 2 16 13 19 17 8 14 11 ...
view save

correct output
YES
366
2 3 4 5 6 7 8 9 10 11 12 13 14...
view save

user output
YES
132
2 3 4 5 6 7 8 9 10 11 12 13 14...
Truncated

Test 4

Group: 1

Verdict: ACCEPTED

input
100 2
100 92 62 88 12 7 43 31 19 72 ...
view save

correct output
YES
2876
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
view save

user output
YES
2438
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
Truncated

Test 5

Group: 1

Verdict: ACCEPTED

input
100 2
100 99 98 97 96 95 94 93 92 91...
view save

correct output
YES
5248
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
view save

user output
YES
4950
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
Truncated

Test 6

Group: 2

Verdict: ACCEPTED

input
5 3
1 2 3 4 5
view save

correct output
YES
0
view save

user output
YES
0
view save

Test 7

Group: 2

Verdict: ACCEPTED

input
5 3
3 5 4 1 2
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correct output
NO
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user output
NO
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Test 8

Group: 2

Verdict: ACCEPTED

input
5 3
5 2 1 4 3
view save

correct output
YES
8
1 2 1 3 1 2 3 1
view save

user output
YES
2
1 3 
view save

Test 9

Group: 2

Verdict: ACCEPTED

input
20 3
19 14 1 18 3 4 11 20 13 6 17 8...
view save

correct output
YES
52
8 10 12 14 16 18 1 3 5 7 9 11 ...
view save

user output
YES
42
1 3 4 5 7 8 9 10 11 12 13 14 1...
Truncated

Test 10

Group: 2

Verdict: ACCEPTED

input
20 3
9 6 13 18 5 10 3 2 7 20 1 4 19...
view save

correct output
YES
50
10 12 14 16 18 13 15 17 4 6 8 ...
view save

user output
YES
34
3 4 5 6 7 9 10 12 13 14 15 16 ...
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Test 11

Group: 2

Verdict: ACCEPTED

input
500 3
53 52 21 76 25 142 5 4 83 176 ...
view save

correct output
YES
15194
334 336 338 340 342 344 346 34...
view save

user output
YES
15174
1 3 5 6 10 11 12 13 14 15 16 1...
Truncated

Test 12

Group: 2

Verdict: ACCEPTED

input
500 3
51 44 147 172 1 28 27 82 233 1...
view save

correct output
YES
15565
366 368 370 372 374 376 378 38...
view save

user output
YES
15543
3 4 5 6 8 10 11 12 13 15 16 17...
Truncated

Test 13

Group: 2

Verdict: ACCEPTED

input
500 3
75 46 179 62 221 14 67 154 89 ...
view save

correct output
YES
15920
454 456 458 460 462 464 466 46...
view save

user output
YES
15902
4 5 7 9 10 11 12 13 14 15 16 1...
Truncated

Test 14

Group: 2

Verdict: ACCEPTED

input
500 3
161 54 285 12 71 142 111 94 97...
view save

correct output
YES
15931
408 410 412 414 416 418 420 42...
view save

user output
YES
15907
2 3 5 6 7 8 9 10 11 13 15 16 1...
Truncated

Test 15

Group: 2

Verdict: ACCEPTED

input
500 3
122 260 455 113 315 276 433 43...
view save

correct output
NO
view save

user output
NO
view save

Test 16

Group: 2

Verdict: ACCEPTED

input
500 3
499 500 497 498 495 496 493 49...
view save

correct output
YES
62264
2 4 6 8 10 12 14 16 18 20 22 2...
view save

user output
YES
62250
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
Truncated

Test 17

Group: 3

Verdict: ACCEPTED

input
5 4
1 2 3 4 5
view save

correct output
YES
0
view save

user output
YES
2
1 1 
view save

Test 18

Group: 3

Verdict: ACCEPTED

input
5 4
5 1 2 3 4
view save

correct output
YES
4
1 2 1 2
view save

user output
YES
18
1 1 2 1 2 2 1 1 1 2 1 1 2 1 2 ...
view save

Test 19

Group: 3

Verdict: ACCEPTED

input
500 4
58 14 107 124 4 113 24 290 56 ...
view save

correct output
YES
15698
389 392 395 398 401 404 407 41...
view save

user output
YES
14736
24 21 18 15 12 9 6 4 3 1 17 14...
Truncated

Test 20

Group: 3

Verdict: ACCEPTED

input
500 4
113 187 278 242 23 67 48 298 3...
view save

correct output
YES
15004
480 481 480 482 485 488 491 49...
view save

user output
YES
13820
265 262 259 256 253 250 247 24...
Truncated

Test 21

Group: 3

Verdict: ACCEPTED

input
500 4
5 233 199 35 213 354 11 134 30...
view save

correct output
YES
16770
458 461 464 467 470 473 476 47...
view save

user output
YES
15485
227 224 221 218 215 212 209 20...
Truncated

Test 22

Group: 3

Verdict: ACCEPTED

input
500 4
169 47 21 137 57 138 360 147 4...
view save

correct output
YES
15889
497 371 372 371 373 376 379 38...
view save

user output
YES
14796
58 55 52 49 46 43 40 37 34 31 ...
Truncated

Test 23

Group: 3

Verdict: ACCEPTED

input
500 4
493 409 291 313 156 443 496 40...
view save

correct output
YES
22886
480 481 480 482 485 488 491 49...
view save

user output
YES
21808
338 335 332 329 326 323 320 31...
Truncated

Test 24

Group: 3

Verdict: ACCEPTED

input
500 4
137 99 100 226 326 298 140 340...
view save

correct output
NO
view save

user output
NO
view save

Test 25

Group: 3

Verdict: ACCEPTED

input
500 4
500 499 498 497 496 495 494 49...
view save

correct output
YES
41458
1 2 1 2 5 8 11 14 17 20 23 26 ...
view save

user output
YES
41847
497 494 491 488 485 482 479 47...
Truncated

Test 26

Group: 4

Verdict: ACCEPTED

input
5 5
1 2 3 4 5
view save

correct output
YES
0
view save

user output
YES
2
1 1 
view save

Test 27

Group: 4

Verdict: ACCEPTED

input
5 5
5 4 3 2 1
view save

correct output
YES
1
1
view save

user output
YES
1
1 
view save

Test 28

Group: 4

Verdict: ACCEPTED

input
500 5
145 26 285 154 147 314 141 40 ...
view save

correct output
YES
13786
216 220 224 228 232 236 240 24...
view save

user output
YES
13242
81 77 73 69 65 61 57 53 49 45 ...
Truncated

Test 29

Group: 4

Verdict: ACCEPTED

input
500 5
137 22 399 292 249 6 51 224 42...
view save

correct output
YES
13465
456 460 464 468 472 476 480 48...
view save

user output
YES
13039
467 463 459 455 451 447 443 43...
Truncated

Test 30

Group: 4

Verdict: ACCEPTED

input
500 5
153 52 85 100 329 60 433 468 4...
view save

correct output
YES
13642
377 378 377 380 384 388 392 39...
view save

user output
YES
13012
203 199 195 191 187 183 179 17...
Truncated

Test 31

Group: 4

Verdict: ACCEPTED

input
500 5
267 326 95 108 189 32 291 366 ...
view save

correct output
YES
14639
213 214 213 216 220 224 228 23...
view save

user output
YES
13983
361 357 353 349 345 341 337 33...
Truncated

Test 32

Group: 4

Verdict: ACCEPTED

input
500 5
15 450 272 80 321 101 247 438 ...
view save

correct output
NO
view save

user output
NO
view save

Test 33

Group: 4

Verdict: ACCEPTED

input
499 5
497 498 499 496 495 494 493 49...
view save

correct output
YES
30886
3 7 11 15 19 23 27 31 35 39 43...
view save

user output
YES
31192
495 491 487 483 479 475 471 46...
Truncated

Test 34

Group: 4

Verdict: ACCEPTED

input
500 5
499 500 497 498 495 496 493 49...
view save

correct output
YES
30919
1 4 8 12 16 20 24 28 32 36 40 ...
view save

user output
YES
31309
495 491 487 483 479 475 471 46...
Truncated

Tasks

A Lumimyrsky-B Monistus-C Laskettelukeskus-D Uolevin kalansaalis-E Käännöt-F Säähavainnot-

Submissions (andreibe)

2023-11-06 20:01:32 1002023-11-06 20:00:45 682023-11-06 19:59:37 352023-11-06 19:42:11 652023-11-06 19:27:47 652023-11-06 19:27:09 02023-11-06 17:58:14 322023-11-06 17:57:26 322023-11-06 17:56:18 322023-11-06 17:55:12 2023-11-04 13:47:31 32