Submission #944536

#	Time	Username	Problem	Language	Result	Execution time	Memory
944536		rainboy	막대기 (KOI13_game)	C11	100 / 100	59 ms	4584 KiB

game

#include <stdio.h>

#define N	100000

int abs_(int a) { return a > 0 ? a : -a; }
long long max(long long a, long long b) { return a > b ? a : b; }

unsigned int X = 12345;

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

int xx[N], yy[N], ww[N];

int compare_x(int i, int j) { return xx[i] - xx[j]; }
int compare_y(int i, int j) { return yy[i] - yy[j]; }
int compare_xy(int i, int j) { return xx[i] != xx[j] ? xx[i] - xx[j] : yy[i] - yy[j]; }

int (*compare)(int, int);

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) {
			int c = compare(ii[j], i_);

			if (c == 0)
				j++;
			else if (c < 0) {
				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 main() {
	static int ii[N];
	static long long dpx[N], dpy[N];
	int n, l, h, i, x, y;
	long long zx, zy, ans;

	scanf("%d%d", &n, &l);
	for (i = 0; i < n; i++) {
		scanf("%d%d", &xx[i], &yy[i]);
		ww[i] = abs_(xx[i] - yy[i]) + l;
	}
	for (i = 0; i < n; i++)
		ii[i] = i;
	compare = compare_x, sort(ii, 0, n);
	for (i = 0, x = 0; i < n; i++)
		xx[ii[i]] = i + 1 == n || xx[ii[i + 1]] != xx[ii[i]] ? x++ : x;
	compare = compare_y, sort(ii, 0, n);
	for (i = 0, y = 0; i < n; i++)
		yy[ii[i]] = i + 1 == n || yy[ii[i + 1]] != yy[ii[i]] ? y++ : y;
	compare = compare_xy, sort(ii, 0, n);
	ans = 0;
	for (h = 0; h < n; h++) {
		i = ii[h], x = xx[i], y = yy[i];
		zx = dpx[x] + ww[i], zy = dpy[y] + ww[i];
		ans = max(ans, max(zx, zy));
		dpy[y] = max(dpy[y], zx);
		dpx[x] = max(dpx[x], zy);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

game.c: In function 'main':
game.c:50:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |  scanf("%d%d", &n, &l);
      |  ^~~~~~~~~~~~~~~~~~~~~
game.c:52:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 16 / 16
• Subtask 4: 22 / 22
• Subtask 5: 38 / 38