Submission #684849

#	Time	Username	Problem	Language	Result	Execution time	Memory
684849		rainboy	Long Distance Coach (JOI17_coach)	C11	71 / 100	2024 ms	10048 KiB

coach

#include <stdio.h>

#define N	200002
#define M	200001
#define INF	0x3f3f3f3f3f3f3f3fLL

long long min(long long a, long long b) { return a < b ? a : b; }

unsigned int X = 12345;

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

long long yy[N]; int cc[N], n;
long long qq[M], rr[M]; int m;
long long l, t;

long long *vv;

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 (vv[ii[j]] == vv[i_])
				j++;
			else if (vv[ii[j]] < vv[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 hh[M], ii[N];
	static long long aa[N], dp[N], dq[N];
	int w, h, i, j;
	long long x, a, ans;

	scanf("%lld%d%d%d%lld", &l, &m, &n, &w, &t), m++, n += 2;
	for (h = 0; h + 1 < m; h++) {
		scanf("%lld", &x);
		qq[h] = x / t, rr[h] = x % t;
	}
	qq[m - 1] = l / t, rr[h] = l % t;
	for (h = 0; h < m; h++)
		hh[h] = h;
	vv = rr, sort(hh, 0, m);
	yy[0] = 0, cc[0] = 0;
	for (i = 1; i < n; i++)
		scanf("%lld%d", &yy[i], &cc[i]);
	yy[n - 1] = t, cc[n - 1] = 0;
	for (i = 0; i < n; i++)
		ii[i] = i;
	vv = yy, sort(ii, 0, n);
	for (i = 0; i + 1 < n; i++)
		aa[i] = qq[m - 1] + (rr[m - 1] >= yy[ii[i]] ? 1 : 0);
	dp[0] = aa[0] * w - cc[0], dq[0] = INF;
	for (j = 1, h = 0; j < n; j++) {
		a = INF;
		while (h < m && rr[hh[h]] < yy[ii[j]])
			a = min(a, qq[hh[h++]]);
		if (a == INF)
			dq[j] = min(dq[j - 1] + aa[j - 1] * w, dp[j - 1]);
		else {
			dq[j] = INF;
			for (i = j - 1; i >= 0; i--) {
				dq[j] = min(dq[j], dp[i] + a * w * (j - i - 1));
				dq[j] = min(dq[j], dq[i] + a * w * (j - i));
			}
		}
		dp[j] = dq[j] + aa[j] * w - cc[ii[j]];
	}
	ans = dp[n - 1] - aa[n - 1] * w;
	for (i = 0; i < n; i++)
		ans += cc[i];
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

coach.c: In function 'main':
coach.c:46:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  scanf("%lld%d%d%d%lld", &l, &m, &n, &w, &t), m++, n += 2;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coach.c:48:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |   scanf("%lld", &x);
      |   ^~~~~~~~~~~~~~~~~
coach.c:57:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |   scanf("%lld%d", &yy[i], &cc[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29