Problem E. Spaceship Defence

最新推荐文章于 2020-07-20 16:23:13 发布

arhaiyun

最新推荐文章于 2020-07-20 16:23:13 发布

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本挑战涉及在一个复杂的太空船环境中进行战术模拟。士兵们利用不同颜色编码的传送器和涡轮升降机来移动，以实现从起点到终点的最短路径。任务包括分析房间布局、传送设施及移动限制。

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The contest is over. You will be able to try solving the problems for practice soon.

Small input 10 points	The contest is finished.
Large input 14 points	The contest is finished.

Problem

The enemy has invaded your spaceship, and only superior tactics will allow you to defend it! To travel around your spaceship, your soldiers will use two devices: teleporters andturbolifts.

Teleporters allow your soldiers to move instantly between rooms. Every room contains a teleporter, and rooms are color-coded: if a soldier is in a room with some color, she can use the teleporter in that room to immediately move to any other room with the same color.

Turbolifts allow your soldiers to move between rooms more slowly. A turbolift is like an elevator that moves in many directions. Each turbolift moves from one room to one other room, and it takes a certain amount of time to travel. Notes about turbolifts:

Turbolifts are not two-way: if a turbolift moves soldiers from room a to room b, the same turbolift cannot move soldiers from room b to room a, although there might be another turbolift that does that.
More than one soldier can use the same turbolift, and they do not interfere with each other in any way.

You will be given the locations and destinations of several soldiers. For each soldier, output the minimum amount of time it could take that soldier to travel from his location to his destination.

Input

The first line of the input gives the number of test cases, T. T test cases follow.

For every test case:

The first line of every test case contains an integer N, which is the number of rooms in your spaceship. The rooms are numbered from 1 to N. The following N lines each contain a string telling the color of the rooms, from room 1 to room N. The strings only contain characters a-z (the lower-case English letters) and 0-9 (the number 0 to 9), and the length of each string will be less than or equal to 2.

The next line in the test case is an integer M, which indicates the number of turbolifts in your spaceship. The following M lines each contain 3 space-separated integers a_i, b_i, t_i, telling us that there is a turbolift that can transport soldiers from room a_i to room b_i in t_iseconds.

The next line in the test case contains an integer S, which is the number of soldiers at your command. The following S lines each contain two integers: the location and destination of one soldier, p_j and q_j.

Output

For each test case, output one line containing only the string "Case #x:", where x is the number of the test case (starting from 1). On the next S lines, output a single integer: on line j, the smallest number of seconds it could take for a soldier to travel from p_j to q_j. If there is no path from p_j to q_j, the integer you output should be -1.

Limits

1 ≤ S ≤ 100.
1 ≤ a_i, b_i ≤ N.
0 ≤ t_i ≤ 1000.
1 ≤ p_j, q_j ≤ N.

Small dataset

1 ≤ T ≤ 10.
1 ≤ N ≤ 1000.
0 ≤ M ≤ 3000.

Large dataset

T = 1.
1 ≤ N ≤ 80000.
0 ≤ M ≤ 3000.

Sample

Input	Output
3 3 gl t3 t3 3 1 2 217 3 2 567 1 1 21 2 2 1 2 3 4 ca bl bl 8z 0 3 1 2 2 3 1 1 8 re b7 ye gr 0l 0l ye b7 7 4 1 19 2 4 21 2 5 317 4 5 34 4 7 3 4 8 265 8 6 71 3 4 3 2 6 1 4