Submission #767605

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
767605	2023-06-26T22:34:36 Z	rainboy	Marriage questions (IZhO14_marriage)	C	100 / 100	284 ms	1100 KB

marriage

/* https://oj.uz/submission/100855 (Benq) */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define NU	30000
#define NV	2000

unsigned int X = 12345;

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

int nu, nv;
int *eu[NV], eo[NV], el[NV], er[NV];
int uu[NV], vv[NU]; char visited[NV];

void append(int v, int u) {
	int o = eo[v]++;

	if (o >= 2 && (o & o - 1) == 0)
		eu[v] = (int *) realloc(eu[v], o * 2 * sizeof *eu[v]);
	eu[v][o] = u;
}

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 (ii[j] == i_)
				j++;
			else if (ii[j] < 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 dfs(int v) {
	int o;

	if (visited[v])
		return 0;
	visited[v] = 1;
	for (o = el[v]; o < er[v]; o++) {
		int u = eu[v][o], w = vv[u];

		if (w == -1 || dfs(w)) {
			uu[v] = u, vv[u] = v;
			return 1;
		}
	}
	return 0;
}

int check() {
	int v;

	for (v = 0; v < nv; v++)
		if (uu[v] == -1) {
			memset(visited, 0, nv * sizeof *visited);
			if (!dfs(v))
				return 0;
		}
	return 1;
}

int main() {
	int m, h, l, r, u, v, ans;

	scanf("%d%d%d", &nu, &nv, &m);
	for (v = 0; v < nv; v++)
		eu[v] = (int *) malloc(2 * sizeof *eu[v]);
	for (h = 0; h < m; h++) {
		scanf("%d%d", &u, &v), u--, v--;
		append(v, u);
	}
	for (v = 0; v < nv; v++)
		sort(eu[v], 0, eo[v]);
	memset(uu, -1, nv * sizeof *uu), memset(vv, -1, nu * sizeof *vv);
	ans = 0;
	for (l = 0, r = -1; l < nu; l++) {
		while (r < nu && !check()) {
			r++;
			for (v = 0; v < nv; v++)
				if (er[v] < eo[v] && eu[v][er[v]] == r)
					er[v]++;
		}
		ans += nu - r;
		for (v = 0; v < nv; v++) {
			if (el[v] < eo[v] && eu[v][el[v]] == l)
				el[v]++;
			if (uu[v] == l)
				uu[v] = -1;
		}
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message

marriage.c: In function 'append':
marriage.c:22:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   22 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
marriage.c: In function 'main':
marriage.c:78:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |  scanf("%d%d%d", &nu, &nv, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
marriage.c:82:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |   scanf("%d%d", &u, &v), u--, v--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 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	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 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	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	1 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Correct	0 ms	212 KB	Output is correct
22	Correct	0 ms	212 KB	Output is correct
23	Correct	1 ms	212 KB	Output is correct
24	Correct	0 ms	212 KB	Output is correct
25	Correct	6 ms	340 KB	Output is correct
26	Correct	2 ms	340 KB	Output is correct
27	Correct	1 ms	212 KB	Output is correct
28	Correct	1 ms	212 KB	Output is correct
29	Correct	2 ms	340 KB	Output is correct
30	Correct	2 ms	340 KB	Output is correct
31	Correct	52 ms	612 KB	Output is correct
32	Correct	3 ms	340 KB	Output is correct
33	Correct	2 ms	340 KB	Output is correct
34	Correct	9 ms	376 KB	Output is correct
35	Correct	59 ms	860 KB	Output is correct
36	Correct	43 ms	852 KB	Output is correct
37	Correct	156 ms	848 KB	Output is correct
38	Correct	24 ms	876 KB	Output is correct
39	Correct	112 ms	568 KB	Output is correct
40	Correct	55 ms	492 KB	Output is correct
41	Correct	64 ms	556 KB	Output is correct
42	Correct	37 ms	532 KB	Output is correct
43	Correct	40 ms	656 KB	Output is correct
44	Correct	76 ms	928 KB	Output is correct
45	Correct	167 ms	596 KB	Output is correct
46	Correct	251 ms	1088 KB	Output is correct
47	Correct	145 ms	972 KB	Output is correct
48	Correct	192 ms	976 KB	Output is correct
49	Correct	284 ms	1100 KB	Output is correct
50	Correct	277 ms	552 KB	Output is correct