oj.uz

Submission #503303

# Submission time Handle Problem Language Result Execution time Memory
503303 2022-01-07T15:58:36 Z rainboy Cijanobakterije (COCI21_cijanobakterije) C
0 / 70
 1000 ms 13916 KB 
#include <stdio.h>
#include <stdlib.h>

#define N	100000

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

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 d1;

int dfs(int p, int i) {
	int o, d_;

	d_ = 0;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o], d = dfs(i, j);

		if (j != p) {
			dfs(i, j);
			d1 = max(d1, d_ + 1 + d), d_ = max(d_, d);
		}
	}
	return d_ + 1;
}

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

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	while (m--) {
		scanf("%d%d", &i, &j), i--, j--;
		append(i, j);
	}
	d1 = 1, dfs(-1, 0);
	printf("%d\n", d1);
	return 0;
}

Compilation message

Main.c: In function 'append':
Main.c:13:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   13 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'main':
Main.c:38:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:42:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 908 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 6.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1065 ms 13916 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 908 KB Output isn't correct
2 Halted 0 ms 0 KB -