oj.uz

Submission #829599

# Submission time Handle Problem Language Result Execution time Memory
829599 2023-08-18T13:12:26 Z rainboy Airplane (NOI23_airplane) C
100 / 100
 564 ms 21556 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	200000
#define M	400000
#define INF	0x3f3f3f3f

int min(int a, int b) { return a < b ? a : b; }
int max(int a, int b) { return a > b ? a : b; }

unsigned int X = 12345;

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

int n;

int aa[N];

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

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

int *ej[N], eo[N];

void append(int i, int j) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
	ej[i][o] = j;
}

int dd[N];
int qu1[N], cnt1; char in1[N];
int qu2[N], cnt2;

int solve(int t) {
	int h1, h2, i, o;

	memset(dd, 0x3f, n * sizeof *dd);
	memset(in1, 0, n * sizeof *in1);
	dd[0] = 0, in1[0] = 1;
	cnt1 = n, cnt2 = 0, h1 = 0, h2 = 0, i = 0;
	while (h1 < cnt1 || h2 < cnt2) {
		if (h2 == cnt2 || h1 < cnt1 && aa[qu1[h1]] < dd[qu2[h2]]) {
			i = qu1[h1++];
			if (!in1[i])
				continue;
		} else
			i = qu2[h2++];
		if (i == n - 1)
			return 1;
		for (o = eo[i]; o--; ) {
			int j = ej[i][o], d = max(dd[i] + 1, aa[j]);

			if (d + aa[j] <= t && dd[j] > d) {
				dd[j] = d;
				if (d == aa[j])
					in1[j] = 1;
				else
					qu2[cnt2++] = j;
			}
		}
	}
	return 0;
}

int main() {
	static int ii[N];
	int m, h, i, j, lower, upper;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++) {
		scanf("%d", &aa[i]);
		ii[i] = i;
	}
	sort(ii, 0, n);
	for (i = 0; i < n; i++)
		qu1[i] = ii[i];
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j), i--, j--;
		append(i, j), append(j, i);
	}
	lower = -1, upper = INF;
	while (upper - lower > 1) {
		int t = (lower + upper) / 2;

		if (solve(t))
			upper = t;
		else
			lower = t;
	}
	printf("%d\n", upper);
	return 0;
}

Compilation message

Main.c: In function 'append':
Main.c:46:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   46 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'solve':
Main.c:63:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   63 |   if (h2 == cnt2 || h1 < cnt1 && aa[qu1[h1]] < dd[qu2[h2]]) {
      |                     ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c: In function 'main':
Main.c:90:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:92:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:101:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  101 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 109 ms 13236 KB Output is correct
3 Correct 122 ms 13412 KB Output is correct
4 Correct 135 ms 13392 KB Output is correct
5 Correct 121 ms 13364 KB Output is correct
6 Correct 124 ms 13376 KB Output is correct
7 Correct 122 ms 13344 KB Output is correct
8 Correct 0 ms 212 KB Output is correct

Subtask #2
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 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 428 KB Output is correct
8 Correct 1 ms 432 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 2 ms 428 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 1 ms 428 KB Output is correct
17 Correct 2 ms 528 KB Output is correct
18 Correct 0 ms 212 KB Output is correct

Subtask #3
31.0 / 31.0

# 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 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 2 ms 428 KB Output is correct
8 Correct 1 ms 432 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 2 ms 428 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 1 ms 428 KB Output is correct
17 Correct 2 ms 528 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 432 KB Output is correct
23 Correct 1 ms 476 KB Output is correct
24 Correct 1 ms 440 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 2 ms 468 KB Output is correct
28 Correct 3 ms 468 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 2 ms 432 KB Output is correct

Subtask #4
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 109 ms 13236 KB Output is correct
3 Correct 122 ms 13412 KB Output is correct
4 Correct 135 ms 13392 KB Output is correct
5 Correct 121 ms 13364 KB Output is correct
6 Correct 124 ms 13376 KB Output is correct
7 Correct 122 ms 13344 KB Output is correct
8 Correct 0 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 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 428 KB Output is correct
16 Correct 1 ms 432 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 2 ms 428 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 2 ms 468 KB Output is correct
24 Correct 1 ms 428 KB Output is correct
25 Correct 2 ms 528 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 432 KB Output is correct
31 Correct 1 ms 476 KB Output is correct
32 Correct 1 ms 440 KB Output is correct
33 Correct 1 ms 468 KB Output is correct
34 Correct 1 ms 468 KB Output is correct
35 Correct 2 ms 468 KB Output is correct
36 Correct 3 ms 468 KB Output is correct
37 Correct 2 ms 468 KB Output is correct
38 Correct 2 ms 432 KB Output is correct
39 Correct 233 ms 12912 KB Output is correct
40 Correct 199 ms 16352 KB Output is correct
41 Correct 182 ms 16500 KB Output is correct
42 Correct 224 ms 16348 KB Output is correct
43 Correct 190 ms 16508 KB Output is correct
44 Correct 134 ms 16220 KB Output is correct
45 Correct 110 ms 15860 KB Output is correct
46 Correct 204 ms 16516 KB Output is correct
47 Correct 116 ms 16072 KB Output is correct
48 Correct 207 ms 16520 KB Output is correct
49 Correct 202 ms 17184 KB Output is correct
50 Correct 171 ms 16900 KB Output is correct
51 Correct 263 ms 17196 KB Output is correct
52 Correct 461 ms 19636 KB Output is correct
53 Correct 346 ms 18116 KB Output is correct
54 Correct 98 ms 17748 KB Output is correct
55 Correct 379 ms 18244 KB Output is correct
56 Correct 169 ms 20440 KB Output is correct
57 Correct 490 ms 20824 KB Output is correct
58 Correct 150 ms 21544 KB Output is correct
59 Correct 180 ms 21532 KB Output is correct
60 Correct 181 ms 21556 KB Output is correct
61 Correct 476 ms 21324 KB Output is correct
62 Correct 174 ms 20316 KB Output is correct
63 Correct 564 ms 20880 KB Output is correct
64 Correct 172 ms 20532 KB Output is correct
65 Correct 359 ms 20928 KB Output is correct
66 Correct 191 ms 20496 KB Output is correct
67 Correct 436 ms 20880 KB Output is correct