Submission #684591

#	Time	Username	Problem	Language	Result	Execution time	Memory
684591		rainboy	Arranging Tickets (JOI17_arranging_tickets)	C11	45 / 100	6022 ms	308 KiB

arranging_tickets

#include <stdio.h>

#define N	200000
#define M	100000
#define INF	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; }

int main() {
	static int ll[M], rr[M], ww[M];
	static long long vv[N];
	int n, m, h, i, j, r, tmp;
	long long v, w, x, y, z, ans;

	scanf("%d%d", &n, &m), n--;
	x = 0;
	for (h = 0; h < m; h++) {
		scanf("%d%d%d", &ll[h], &rr[h], &ww[h]), ll[h]--, rr[h]--;
		if (ll[h] > rr[h])
			tmp = ll[h], ll[h] = rr[h], rr[h] = tmp;
		vv[ll[h]] -= ww[h], vv[rr[h]] += ww[h];
		x += ww[h];
	}
	for (i = 1; i < n; i++)
		vv[i] += vv[i - 1];
	v = -INF;
	for (i = 0; i < n; i++)
		v = max(v, vv[i]);
	for (i = 0; i < n; i++)
		vv[i] = v - vv[i];
	ans = INF;
	for (r = 0; r < 2; r++) {
		y = INF;
		for (i = 0; i < n; i++) {
			w = 0;
			for (h = 0; h < m; h++)
				if (rr[h] <= i || i + 1 <= ll[h])
					w += ww[h];
			y = min(y, w + (vv[i] + r) / 2);
		}
		z = INF;
		for (i = 0; i < n; i++)
			for (j = i + 1; j < n; j++) {
				w = 0;
				for (h = 0; h < m; h++)
					if (rr[h] <= i || i + 1 <= ll[h] && rr[h] <= j || j + 1 <= ll[h])
						w += ww[h];
				z = min(z, w + (vv[i] + r) / 2 + (vv[j] + r) / 2);
			}
		ans = min(ans, x - min(min(x, y), z) + v + r);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

arranging_tickets.c: In function 'main':
arranging_tickets.c:16:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  scanf("%d%d", &n, &m), n--;
      |  ^~~~~~~~~~~~~~~~~~~~~
arranging_tickets.c:19:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   scanf("%d%d%d", &ll[h], &rr[h], &ww[h]), ll[h]--, rr[h]--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 35 / 35
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 15