Submission #708039

#	Time	Username	Problem	Language	Result	Execution time	Memory
708039		rainboy	Robot (JOI21_ho_t4)	C11	100 / 100	992 ms	147964 KiB

Main

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N	200000
#define M	200000
#define N_	(N + M * 6)
#define INF	0x3f3f3f3f3f3f3f3f

unsigned int X = 12345;

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

int ij[M * 2], cc[M], ww[M], m;
int *eh[N], eo[N], n;
int *ej[N_], eo_[N_], n_; long long *ew[N_];

int newnode() {
	int i = n_++;

	ej[i] = (int *) malloc(2 * sizeof *ej[i]);
	ew[i] = (long long *) malloc(2 * sizeof *ew[i]);
	return i;
}

void append(int i, int h) {
	int o = eo[i]++;

	if (o >= 2 && (o & o - 1) == 0)
		eh[i] = (int *) realloc(eh[i], o * 2 * sizeof *eh[i]);
	eh[i][o] = h;
}

void append_(int i, int j, long long w) {
	int o = eo_[i]++;

	if (o >= 2 && (o & o - 1) == 0) {
		ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
		ew[i] = (long long *) realloc(ew[i], o * 2 * sizeof *ew[i]);
	}
	ej[i][o] = j, ew[i][o] = w;
}

void sort(int *hh, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, h = hh[l + rand_() % (r - l)], tmp;

		while (j < k)
			if (cc[hh[j] >> 1] == cc[h >> 1])
				j++;
			else if (cc[hh[j] >> 1] < cc[h >> 1]) {
				tmp = hh[i], hh[i] = hh[j], hh[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = hh[j], hh[j] = hh[k], hh[k] = tmp;
			}
		sort(hh, l, i);
		l = k;
	}
}

void add_edges(int *hh, int m, int i) {
	static int uu[M], vv[M];
	static long long pp[M], qq[M];
	int h, h_, j;
	long long sum;

	for (h = 0; h < m; h++) {
		uu[h] = newnode();
		vv[h] = newnode();
	}
	sum = 0;
	for (h = 0; h < m; h++) {
		h_ = hh[h];
		sum += ww[h_ >> 1];
	}
	for (h = 0; h < m; h++) {
		h_ = hh[h], j = ij[h_ ^ 1];
		append_(i, j, sum - ww[h_ >> 1]);
		append_(i, n + h_, ww[h_ >> 1]);
	}
	pp[0] = 0;
	for (h = 0; h + 1 < m; h++) {
		h_ = hh[h];
		pp[h + 1] = pp[h] + ww[h_ >> 1];
	}
	qq[m - 1] = 0;
	for (h = m - 1; h > 0; h--) {
		h_ = hh[h];
		qq[h - 1] = qq[h] + ww[h_ >> 1];
	}
	for (h = 0; h < m; h++) {
		h_ = hh[h], j = ij[h_ ^ 1];
		append_(n + (h_ ^ 1), i, 0);
		if (h + 1 < m)
			append_(n + (h_ ^ 1), uu[h + 1], pp[h]);
		if (h > 0)
			append_(n + (h_ ^ 1), vv[h - 1], qq[h]);
		append_(uu[h], j, qq[h]), append_(vv[h], j, pp[h]);
	}
	for (h = 0; h + 1 < m; h++) {
		h_ = hh[h];
		append_(uu[h], uu[h + 1], ww[h_ >> 1]);
	}
	for (h = m - 1; h > 0; h--) {
		h_ = hh[h];
		append_(vv[h], vv[h - 1], ww[h_ >> 1]);
	}
}

long long dd[N_]; int iq[N_ + 1], pq[N_], cnt;

int lt(int i, int j) { return dd[i] < dd[j]; }

int p2(int p) {
	return (p *= 2) > cnt ? 0 : (p < cnt && lt(iq[p + 1], iq[p]) ? p + 1 : p);
}

void pq_up(int i) {
	int p, q, j;

	for (p = pq[i]; (q = p / 2) && lt(i, j = iq[q]); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_dn(int i) {
	int p, q, j;

	for (p = pq[i]; (q = p2(p)) && lt(j = iq[q], i); p = q)
		iq[pq[j] = p] = j;
	iq[pq[i] = p] = i;
}

void pq_add_last(int i) {
	iq[pq[i] = ++cnt] = i;
}

int pq_remove_first() {
	int i = iq[1], j = iq[cnt--];

	if (j != i)
		pq[j] = 1, pq_dn(j);
	pq[i] = 0;
	return i;
}

int main() {
	int h, i, j, c, o, o_;

	scanf("%d%d", &n, &m);
	for (i = 0; i < n; i++)
		eh[i] = (int *) malloc(2 * sizeof *eh[i]);
	for (h = 0; h < m; h++) {
		scanf("%d%d%d%d", &i, &j, &c, &ww[h]), i--, j--, c--;
		ij[h << 1 | 0] = i, ij[h << 1 | 1] = j, cc[h] = c;
		append(i, h << 1 | 0), append(j, h << 1 | 1);
	}
	for (i = 0; i < n + m * 2; i++)
		newnode();
	for (i = 0; i < n; i++) {
		sort(eh[i], 0, eo[i]);
		for (o = 0; o < eo[i]; o = o_) {
			o_ = o + 1, c = cc[eh[i][o] >> 1];
			while (o_ < eo[i] && cc[eh[i][o_] >> 1] == c)
				o_++;
			add_edges(eh[i] + o, o_ - o, i);
		}
	}
	memset(dd, 0x3f, n_ * sizeof *dd);
	dd[0] = 0, pq_add_last(0);
	while (cnt) {
		i = pq_remove_first();
		if (i == n - 1) {
			printf("%lld\n", dd[i]);
			return 0;
		}
		for (o = eo_[i]; o--; ) {
			long long w, d;

			j = ej[i][o], w = ew[i][o], d = dd[i] + w;
			if (dd[j] > d) {
				if (dd[j] == INF)
					pq_add_last(j);
				dd[j] = d, pq_up(j);
			}
		}
	}
	printf("-1\n");
	return 0;
}

Compilation message (stderr)

Main.c: In function 'append':
Main.c:31:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   31 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
Main.c: In function 'append_':
Main.c:39:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   39 |  if (o >= 2 && (o & o - 1) == 0) {
      |                     ~~^~~
Main.c: In function 'main':
Main.c:154:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  154 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:158:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  158 |   scanf("%d%d%d%d", &i, &j, &c, &ww[h]), i--, j--, c--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 34 / 34
• Subtask 2: 24 / 24
• Subtask 3: 42 / 42