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Submission #441881

# Submission time Handle Problem Language Result Execution time Memory
441881 2021-07-06T13:27:23 Z rainboy Teleporters (IOI08_teleporters) C++
90 / 100
 1000 ms 28128 KB 
#include <stdio.h>

#define N	1000000

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

int xx[N * 2];

int compare_x(const void *a, const void *b) {
	int i = *(int *) a;
	int j = *(int *) b;

	return xx[i] - xx[j];
}

int compare_(const void *a, const void *b) {
	int ia = *(int *) a;
	int ib = *(int *) b;

	return ib - ia;
}

int (*compare)(const void *, const void *);

void sort(int *aa, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, a = aa[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = compare(&aa[j], &a);

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = aa[i], aa[i] = aa[j], aa[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = aa[j], aa[j] = aa[k], aa[k] = tmp;
			}
		}
		sort(aa, l, i);
		l = k;
	}
}

int main() {
	static int ii[N * 2], pp[N * 2], cc[N * 2];
	static char visited[N * 2];
	int n, n_, m, h, i, ans;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n * 2; i++) {
		scanf("%d", &xx[i]);
		ii[i] = i;
	}
	compare = compare_x, sort(ii, 0, n * 2);
	for (h = 0; h < n * 2; h++)
		pp[ii[h]] = h + 1 == n * 2 ? -1 : ii[h + 1] ^ 1;
	ans = 0;
	for (i = ii[0] ^ 1; i != -1; i = pp[i])
		visited[i] = 1, ans++;
	n_ = 0;
	for (i = 0; i < n * 2; i++)
		if (!visited[i]) {
			int c;

			c = 0;
			while (!visited[i]) {
				visited[i] = 1, c++;
				i = pp[i];
			}
			cc[n_++] = c;
			while (visited[i] == 1) {
				visited[i] = 2;
				i = pp[i];
			}
		}
	compare = compare_, sort(cc, 0, n_);
	for (i = 0; i < n_ && i < m; i++)
		ans += cc[i];
	ans += m * 2 - (m > n_ ? (m - n_) % 2 : 0);
	printf("%d\n", ans);
	return 0;
}

Compilation message

teleporters.cpp: In function 'int main()':
teleporters.cpp:56:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |  scanf("%d%d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~
teleporters.cpp:58:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |   scanf("%d", &xx[i]);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 7 ms 588 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 332 KB Output is correct
2 Correct 8 ms 588 KB Output is correct
3 Correct 19 ms 1012 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 588 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 716 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 3644 KB Output is correct
2 Correct 334 ms 8296 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 187 ms 6008 KB Output is correct
2 Correct 389 ms 12144 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 572 ms 17816 KB Output is correct
2 Correct 723 ms 21248 KB Output is correct
3 Correct 798 ms 24388 KB Output is correct

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 930 ms 24000 KB Output is correct
2 Execution timed out 1071 ms 26532 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1028 ms 28128 KB Time limit exceeded
2 Halted 0 ms 0 KB -