Submission #485869

#	Time	Username	Problem	Language	Result	Execution time	Memory
485869		rainboy	ČVENK (COI15_cvenk)	C11	0 / 100	41 ms	2204 KiB

cvenk

#include <stdio.h>

#define N	100000
#define X	512

int kk[X][X], n, x_, y_;

int dfs1(int x, int y) {
	int k, k1, k2;

	if (x >= X || y >= X || (x & y) != 0)
		return 0;
	k1 = dfs1(x, y + 1), k2 = dfs1(x + 1, y), k = kk[x][y] + k1 + k2;
	if (k1 * 2 <= n && k2 * 2 <= n && (n - k) * 2 <= n)
		x_ = x, y_ = y;
	return k;
}

long long ans;

int dist(int x1, int y1, int x2, int y2) {
	int d = 0;

	while (x1 != x2 || y1 != y2) {
		d++;
		if (x1 + y1 > x2 + y2) {
			if ((x1 - 1 & y1) == 0)
				x1--;
			else
				y1--;
		} else {
			if ((x2 - 1 & y2) == 0)
				x2--;
			else
				y2--;
		}
	}
	return d;
}

int main() {
	static int xx[N], yy[N];
	int i;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d%d", &xx[i], &yy[i]);
		kk[xx[i]][yy[i]]++;
	}
	dfs1(0, 0);
	ans = 0;
	for (i = 0; i < n; i++)
		ans += (long long) kk[xx[i]][yy[i]] * dist(xx[i], yy[i], x_, y_);
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

cvenk.c: In function 'dist':
cvenk.c:27:12: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   27 |    if ((x1 - 1 & y1) == 0)
      |         ~~~^~~
cvenk.c:32:12: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   32 |    if ((x2 - 1 & y2) == 0)
      |         ~~~^~~
cvenk.c: In function 'main':
cvenk.c:45:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
cvenk.c:47:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 21
• Subtask 3: 0 / 22
• Subtask 4: 0 / 40