oj.uz

Submission #381151

# Submission time Handle Problem Language Result Execution time Memory
381151 2021-03-24T16:32:59 Z rainboy Duathlon (APIO18_duathlon) C
8 / 100
 61 ms 7532 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	100000
#define M	200000

int ds[N], mm[N], nn[N];

int find(int i) {
	return ds[i] < 0 ? i : (ds[i] = find(ds[i]));
}

void join(int i, int j) {
	i = find(i);
	j = find(j);
	if (i == j) {
		mm[i]++;
		return;
	}
	if (ds[i] > ds[j])
		ds[i] = j, mm[j] += mm[i] + 1, nn[j] += nn[i];
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i, mm[i] += mm[j] + 1, nn[i] += nn[j];
	}
}

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 sz[N];

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

	sz[i] = 1;
	for (o = eo[i]; o--; ) {
		int j = ej[i][o];

		if (j != p) {
			dfs(i, j);
			sz[i] += sz[j];
		}
	}
}

int main() {
	static int dd[N];
	int n, m, h, i, j, pathcyc;
	long long ans;

	scanf("%d%d", &n, &m);
	memset(ds, -1, n * sizeof *ds);
	for (i = 0; i < n; i++) {
		nn[i] = 1;
		ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	}
	for (h = 0; h < m; h++) {
		scanf("%d%d", &i, &j), i--, j--;
		dd[i]++, dd[j]++;
		join(i, j);
		append(i, j);
	}
	pathcyc = 1;
	for (i = 0; i < n; i++)
		if (dd[i] > 2) {
			pathcyc = 0;
			break;
		}
	if (pathcyc) {
		ans = 0;
		for (i = 0; i < n; i++)
			if (ds[i] < 0)
				ans += nn[i] == mm[i] ?  (long long) nn[i] * (nn[i] - 1) * (nn[i] - 2) : (long long) nn[i] * (nn[i] - 1) * (nn[i] - 2) / 3;
	} else {
		dfs(-1, 0);
		ans = (long long) n * (n - 1) * (n - 2);
		for (i = 1; i < n; i++)
			ans -= (long long) sz[i] * (sz[i] - 1) + (long long) (n - sz[i]) * (n - sz[i] - 1);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message

count_triplets.c: In function 'append':
count_triplets.c:35:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   35 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
count_triplets.c: In function 'main':
count_triplets.c:61:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   61 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
count_triplets.c:68:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   68 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 7148 KB Output is correct
2 Correct 60 ms 7148 KB Output is correct
3 Correct 58 ms 7148 KB Output is correct
4 Correct 57 ms 7232 KB Output is correct
5 Correct 54 ms 7148 KB Output is correct
6 Correct 52 ms 7148 KB Output is correct
7 Correct 54 ms 7020 KB Output is correct
8 Correct 53 ms 7020 KB Output is correct
9 Correct 58 ms 7296 KB Output is correct
10 Correct 58 ms 7276 KB Output is correct
11 Correct 46 ms 7148 KB Output is correct
12 Correct 52 ms 7020 KB Output is correct
13 Correct 42 ms 7020 KB Output is correct
14 Correct 40 ms 7020 KB Output is correct
15 Correct 41 ms 6892 KB Output is correct
16 Correct 35 ms 6844 KB Output is correct
17 Correct 7 ms 5996 KB Output is correct
18 Correct 7 ms 6124 KB Output is correct
19 Correct 7 ms 5996 KB Output is correct
20 Correct 7 ms 5996 KB Output is correct
21 Correct 9 ms 5868 KB Output is correct
22 Correct 8 ms 5868 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 492 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 53 ms 7532 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 55 ms 7356 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -