Submission #503211

#	Time	Username	Problem	Language	Result	Execution time	Memory
503211		rainboy	Kutije (COCI21_kutije)	C11	70 / 70	226 ms	9124 KiB

Main

#include <stdio.h>
#include <string.h>

#define N	1000

int ds[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)
		return;
	if (ds[i] > ds[j])
		ds[i] = j;
	else {
		if (ds[i] == ds[j])
			ds[i]--;
		ds[j] = i;
	}
}

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

	scanf("%d%d%d", &n, &m, &q);
	memset(ds, -1, n * sizeof *ds);
	while (m--)
		for (i = 0; i < n; i++) {
			scanf("%d", &j), j--;
			join(i, j);
		}
	while (q--) {
		scanf("%d%d", &i, &j), i--, j--;
		printf(find(i) == find(j) ? "DA\n" : "NE\n");
	}
	return 0;
}

Compilation message (stderr)

Main.c: In function 'main':
Main.c:29:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |  scanf("%d%d%d", &n, &m, &q);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:33:4: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |    scanf("%d", &j), j--;
      |    ^~~~~~~~~~~~~~~
Main.c:37:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 35 / 35