Submission #544776

#	Time	Username	Problem	Language	Result	Execution time	Memory
544776		rainboy	Bodyguards (CEOI10_bodyguards)	C11	100 / 100	175 ms	11104 KiB

bodyguards

#include <stdio.h>

#define N	200000
#define M	200000

unsigned int X = 12345;

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

int *xx;

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 (xx[ii[j]] == xx[i_])
				j++;
			else if (xx[ii[j]] < xx[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 main() {
	static int aa[N], kk[N], bb[M], ll[M], ii[N], jj[M];
	int n, m, i, j;
	long long a, k, b, l, sum;

	scanf("%d", &n);
	k = 0, sum = 0;
	for (i = 0; i < n; i++) {
		scanf("%d%d", &aa[i], &kk[i]);
		k += kk[i], sum += (long long) aa[i] * kk[i];
		ii[i] = i;
	}
	xx = aa, sort(ii, 0, n);
	scanf("%d", &m);
	b = 0;
	for (j = 0; j < m; j++) {
		scanf("%d%d", &bb[j], &ll[j]);
		b += (long long) bb[j] * ll[j];
		jj[j] = j;
	}
	xx = bb, sort(jj, 0, m);
	a = 0, l = 0, j = m - 1;
	while (j >= 0 && bb[jj[j]] >= k) {
		b -= (long long) bb[jj[j]] * ll[jj[j]], l += ll[jj[j]];
		j--;
	}
	if (a + b < sum && k <= (sum - 1 - a - b) / l) {
		printf("0\n");
		return 0;
	}
	for (i = 0; i < n; i++) {
		a += (long long) aa[ii[i]] * kk[ii[i]], k -= kk[ii[i]];
		while (j >= 0 && bb[jj[j]] >= k) {
			b -= (long long) bb[jj[j]] * ll[jj[j]], l += ll[jj[j]];
			j--;
		}
		if (a + b < sum && k <= (sum - 1 - a - b) / l) {
			printf("0\n");
			return 0;
		}
	}
	printf("1\n");
	return 0;
}

Compilation message (stderr)

bodyguards.c: In function 'main':
bodyguards.c:38:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
bodyguards.c:41:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   scanf("%d%d", &aa[i], &kk[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bodyguards.c:46:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  scanf("%d", &m);
      |  ^~~~~~~~~~~~~~~
bodyguards.c:49:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%d%d", &bb[j], &ll[j]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10