Submission #683963

#	Time	Username	Problem	Language	Result	Execution time	Memory
683963		rainboy	Long Distance Coach (JOI17_coach)	C11	0 / 100	0 ms	340 KiB

coach

#include <stdio.h>

#define N	200002
#define M	200002
#define LINF	0x3f3f3f3f3f3f3f3fLL

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

unsigned int X = 12345;

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

long long xx[M], xx_[M]; int ll[M], rr[M], jj[M], m;

int compare_x(int i, int j) {
	return xx[i] == xx[j] ? 0 : (xx[i] < xx[j] ? -1 : 1);
}

long long uu[N]; int cc[N], ii[N], n;

int compare_u(int i, int j) {
	return uu[i] == uu[j] ? 0 : (uu[i] < uu[j] ? -1 : 1);
}

int compare_r(int i, int j) {
	return rr[i] - rr[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 search(long long u) {
	int lower = -1, upper = n;

	while (upper - lower > 1) {
		int i = (lower + upper) / 2;

		if (uu[ii[i]] <= u)
			lower = i;
		else
			upper = i;
	}
	return lower;
}

int main() {
	static long long tt[N], dp[N];
	int i, i_, j, j_;
	long long md, w, x_, x, y, z, ans;

	scanf("%lld%d%d%lld%lld", &x_, &m, &n, &w, &md), n++, m += 2;
	xx[0] = -1, xx[m - 1] = x_;
	for (j = 1; j + 1 < m; j++)
		scanf("%lld", &xx[j]);
	for (j = 0; j < m; j++)
		jj[j] = j;
	compare = compare_x, sort(jj, 0, m);
	for (j = 0; j < m; j++)
		xx_[j] = xx[jj[j]];
	for (j = 0; j < m; j++)
		xx[j] = xx_[j];
	uu[0] = 0;
	for (i = 1; i < n; i++)
		scanf("%lld%d", &uu[i], &cc[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	compare = compare_u, sort(ii, 0, n);
	dp[0] = 0;
	for (j = 1; j < m; j++) {
		x = xx[j - 1], y = xx[j];
		ll[j] = search(y % md - (y - x)) + 1, rr[j] = search(y % md);
	}
	for (j = 1; j < m; j++)
		jj[j - 1] = j;
	compare = compare_r, sort(jj, 0, m - 1);
	for (i = 0; i < n; i++)
		tt[i] = (x_ + md - uu[ii[i]]) / md;
	for (i = 0, j = 0; i < n; i++) {
		if (i == 0)
			dp[i] = ((x_ + md - uu[ii[i]]) / md) * w;
		else {
			dp[i] = LINF;
			z = 0;
			for (i_ = i - 1; i_ >= 0; i_--) {
				dp[i] = min(dp[i], dp[i_] + z);
				z += tt[i_] * w + cc[ii[i_]];
			}
			dp[i] += ((x_ + md - uu[ii[i]]) / md) * w;
		}
		while (j < m - 1 && rr[j_ = jj[j]] == i) {
			j++;
			for (i_ = ll[j_]; i_ <= rr[j_]; i_++)
				tt[i_] = min(tt[i_], (xx[j_] + md - uu[i_]) / md - 1);
		}
	}
	ans = LINF, z = 0;
	for (i_ = n - 1; i_ >= 0; i_--) {
		ans = min(ans, dp[i_] + z);
		z += tt[i_] * w + cc[ii[i_]];
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

coach.c: In function 'main':
coach.c:75:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |  scanf("%lld%d%d%lld%lld", &x_, &m, &n, &w, &md), n++, m += 2;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coach.c:78:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |   scanf("%lld", &xx[j]);
      |   ^~~~~~~~~~~~~~~~~~~~~
coach.c:88:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |   scanf("%lld%d", &uu[i], &cc[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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