Submission #134255

#	Time	Username	Problem	Language	Result	Execution time	Memory
134255		Kastanda	Toll (BOI17_toll)	C++11	100 / 100	169 ms	63632 KiB

toll

#include<bits/stdc++.h>
#define pb push_back
#define x first
#define y second
using namespace std;
const int N = 150005, K = 6, LG = 17;
int n, m, k, q, P[LG][N][K];
int main()
{
	memset(P, 63, sizeof(P));
	scanf("%d%d%d%d", &k, &n, &m, &q);
	for (int i = 1; i <= m; i++)
	{
		int a, b, t;
		scanf("%d%d%d", &a, &b, &t);
		P[0][a][b % k] = min(P[0][a][b % k], t);
	}
	int pw = 1;
	for (int i = 1; i < LG; i++)
	{
		if (pw * k >= n)
			break;
		for (int j = 0; j < n; j++)
			for (int h = 0; h < k; h++)
				for (int md = 0; md < k; md++)
					P[i][j][h] = min(P[i][j][h], P[i - 1][j][md] + P[i - 1][(j / k + pw) * k + md][h]);
		pw <<= 1;
	}
	for (; q; q --)
	{
		int a, b, D[K], T[K];
		scanf("%d%d", &a, &b);
		if (a > b)
		{
			printf("-1\n");
			continue;
		}
		memset(D, 63, sizeof(D));
		D[a % k] = 0;
		a = a / k * k;
		for (int i = 0; i < LG; i++)
			if ((a / k - b / k) & (1 << i))
			{
				memset(T, 63, sizeof(T));
				for (int f = 0; f < k; f ++)
					for (int h = 0; h < k; h ++)
						T[h] = min(T[h], D[f] + P[i][a + f][h]);
				for (int h = 0; h < k; h ++)
					D[h] = T[h];
				a += (1 << i) * k;
			}
		if (D[b % k] > (int)(6e8))
			printf("-1\n");
		else
			printf("%d\n", D[b % k]);
	}
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &k, &n, &m, &q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &a, &b, &t);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~
toll.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 8 / 8
• Subtask 4: 31 / 31
• Subtask 5: 44 / 44