oj.uz

Submission #587258

# Submission time Handle Problem Language Result Execution time Memory
587258 2022-07-01T14:29:32 Z rainboy Naboj (COCI22_naboj) C
110 / 110
 386 ms 25088 KB 
#include <stdio.h>
#include <stdlib.h>

#define N	200000
#define M	500000

int ij[M];
int *eh[N], eo[N];

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

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

char visited[N]; int dd[N][2], ii[N], cc[N], cnt;

void dfs(int i) {
	int o;

	if (visited[i] || dd[i][0] > 0 && dd[i][1] > 0)
		return;
	visited[i] = 1;
	ii[cnt] = i, cc[cnt] = dd[i][0] == 0 ? 0 : 1, cnt++;
	for (o = eo[i]; o--; ) {
		int h = eh[i][o], j = i ^ ij[h >> 1];

		dd[j][h & 1 ^ 1]--, dfs(j);
	}
}

int main() {
	int n, m, h, i, j;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j), i--, j--;
		ij[h] = i ^ j;
		append(i, h << 1 | 0), dd[i][0]++;
		append(j, h << 1 | 1), dd[j][1]++;
	}
	for (i = 0; i < n; i++)
		dfs(i);
	for (i = 0; i < n; i++)
		if (!visited[i]) {
			printf("-1\n");
			return 0;
		}
	printf("%d\n", cnt);
	while (cnt--)
		printf("%d %d\n", ii[cnt] + 1, cc[cnt]);
	return 0;
}

Compilation message

naboj.c: In function 'append':
naboj.c:13:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   13 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
naboj.c: In function 'dfs':
naboj.c:23:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   23 |  if (visited[i] || dd[i][0] > 0 && dd[i][1] > 0)
      |                    ~~~~~~~~~~~~~^~~~~~~~~~~~~~~
naboj.c:30:11: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   30 |   dd[j][h & 1 ^ 1]--, dfs(j);
      |         ~~^~~
naboj.c: In function 'main':
naboj.c:37:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
naboj.c:41:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 284 KB Output is correct
3 Correct 0 ms 288 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 288 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 292 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 176 ms 17532 KB Output is correct
2 Correct 168 ms 17728 KB Output is correct
3 Correct 86 ms 9300 KB Output is correct
4 Correct 174 ms 17576 KB Output is correct
5 Correct 163 ms 17600 KB Output is correct
6 Correct 210 ms 17716 KB Output is correct
7 Correct 158 ms 17764 KB Output is correct
8 Correct 112 ms 13800 KB Output is correct
9 Correct 167 ms 17620 KB Output is correct
10 Correct 163 ms 17596 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 284 KB Output is correct
3 Correct 0 ms 288 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 288 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 292 KB Output is correct
15 Correct 176 ms 17532 KB Output is correct
16 Correct 168 ms 17728 KB Output is correct
17 Correct 86 ms 9300 KB Output is correct
18 Correct 174 ms 17576 KB Output is correct
19 Correct 163 ms 17600 KB Output is correct
20 Correct 210 ms 17716 KB Output is correct
21 Correct 158 ms 17764 KB Output is correct
22 Correct 112 ms 13800 KB Output is correct
23 Correct 167 ms 17620 KB Output is correct
24 Correct 163 ms 17596 KB Output is correct
25 Correct 202 ms 17016 KB Output is correct
26 Correct 205 ms 17896 KB Output is correct
27 Correct 208 ms 19416 KB Output is correct
28 Correct 276 ms 22064 KB Output is correct
29 Correct 146 ms 17076 KB Output is correct
30 Correct 307 ms 21972 KB Output is correct
31 Correct 23 ms 3260 KB Output is correct
32 Correct 183 ms 18236 KB Output is correct
33 Correct 309 ms 24312 KB Output is correct
34 Correct 171 ms 18680 KB Output is correct
35 Correct 316 ms 24560 KB Output is correct
36 Correct 185 ms 18092 KB Output is correct
37 Correct 274 ms 23064 KB Output is correct
38 Correct 257 ms 21176 KB Output is correct
39 Correct 289 ms 24316 KB Output is correct
40 Correct 266 ms 22468 KB Output is correct
41 Correct 257 ms 21964 KB Output is correct
42 Correct 339 ms 25088 KB Output is correct
43 Correct 216 ms 19276 KB Output is correct
44 Correct 386 ms 24900 KB Output is correct
45 Correct 176 ms 18636 KB Output is correct
46 Correct 257 ms 22308 KB Output is correct