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Submission #544729

# Submission time Handle Problem Language Result Execution time Memory
544729 2022-04-02T16:13:31 Z rainboy Swap (BOI16_swap) C
100 / 100
 56 ms 4000 KB 
#include <stdio.h>
#include <string.h>

#define N	200000

int ancestor(int i, int j) {
	return i == j || i < j && ancestor(i, j / 2);
}

int main() {
	static int aa[1 + N];
	static char swap[1 + N * 2];
	int n, i, j;

	scanf("%d", &n);
	for (i = 1; i <= n; i++)
		scanf("%d", &aa[i]);
	memset(swap, -1, n * sizeof *swap);
	for (j = 1; j <= n; j++) {
		int j_;

		i = j * 2 > n ? -1 : (j * 2 < n && aa[j * 2 + 1] < aa[j * 2] ? j * 2 + 1 : j * 2);
		for (j_ = j; j_ >= 1; j_ /= 2)
			if ((j_ & 1) == 0) {
				if (swap[j_] != 1 && (i == -1 || aa[i] > aa[j_]))
					i = j_;
				if (swap[j_] == 0)
					break;
			} else {
				if (swap[j_] != 1 && (i == -1 || aa[i] > aa[j_]))
					i = j_;
				if (j_ > 1 && swap[j_ ^ 1] != 0 && swap[j_] != 0 && (i == -1 || aa[i] > aa[j_ ^ 1]))
					i = j_ ^ 1;
				if (j_ == 1 || swap[j_ ^ 1] == 1 || swap[j_] == 0)
					break;
			}
		if (i == j * 2)
			swap[j * 2] = 1, swap[j * 2 + 1] = 0;
		else if (i == j * 2 + 1)
			swap[j * 2 + 1] = 1;
		else {
			swap[j * 2] = swap[j * 2 + 1] = 0;
			if (ancestor(i, j))
				swap[i] = 0;
			else
				swap[i ^ 1] = swap[i] = 1, i ^= 1;
			for (j_ = j; j_ != i; j_ /= 2) {
				if ((j_ & 1) == 1)
					swap[j_ ^ 1] = 0;
				swap[j_] = 1;
			}
		}
	}
	for (i = 2; i <= n; i++) {
		int tmp;

		if (swap[i])
			tmp = aa[i], aa[i] = aa[i / 2], aa[i / 2] = tmp;
	}
	for (i = 1; i <= n; i++)
		printf("%d ", aa[i]);
	printf("\n");
	return 0;
}

Compilation message

swap.c: In function 'ancestor':
swap.c:7:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |  return i == j || i < j && ancestor(i, j / 2);
      |                   ~~~~~~^~~~~~~~~~~~~~~~~~~~~
swap.c: In function 'main':
swap.c:15:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
swap.c:17:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/string.h:495,
                 from swap.c:2:
In function 'memset',
    inlined from 'main' at swap.c:18:2:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:71:10: warning: '__builtin___memset_chk' specified size between 18446744071562067968 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
   71 |   return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 296 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 296 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 276 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 296 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 296 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 276 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 296 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 16 ms 1108 KB Output is correct
17 Correct 14 ms 1108 KB Output is correct
18 Correct 13 ms 1080 KB Output is correct
19 Correct 14 ms 1076 KB Output is correct
20 Correct 14 ms 1072 KB Output is correct

Subtask #5
32.0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 296 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 296 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 276 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 296 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 16 ms 1108 KB Output is correct
17 Correct 14 ms 1108 KB Output is correct
18 Correct 13 ms 1080 KB Output is correct
19 Correct 14 ms 1076 KB Output is correct
20 Correct 14 ms 1072 KB Output is correct
21 Correct 48 ms 3952 KB Output is correct
22 Correct 47 ms 4000 KB Output is correct
23 Correct 49 ms 3908 KB Output is correct
24 Correct 56 ms 3912 KB Output is correct
25 Correct 55 ms 3916 KB Output is correct