5432: Tourists
内存限制：256 MB
时间限制：2 S
题面：传统
评测方式：文本比较
上传者：
提交：2
通过：1
题目描述
E. Tourists
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output
There are n cities in Cyberland, numbered from 1 to n, connected by m bidirectional roads. The j-th road connects city aj and bj.
For tourists, souvenirs are sold in every city of Cyberland. In particular, city i sell it at a price of wi.
Now there are q queries for you to handle. There are two types of queries:
For tourists, souvenirs are sold in every city of Cyberland. In particular, city i sell it at a price of wi.
Now there are q queries for you to handle. There are two types of queries:
- "C a w": The price in city a is changed to w.
- "A a b": Now a tourist will travel from city a to b. He will choose a route, he also doesn't want to visit a city twice. He will buy souvenirs at the city where the souvenirs are the cheapest (possibly exactly at city a or b). You should output the minimum possible price that he can buy the souvenirs during his travel.
- A route is a sequence of cities [x1,x2,...,xk], where k is a certain positive integer.
- For any 1≤i<j≤k,xi≠xj.
- For any 1≤i<k, there is a road connecting xi and xi+1.
- The minimum price of the route is min(wx1,wx2,...,wxk).
- The required answer is the minimum value of the minimum prices of all valid routes from a to b.
Input
The first line of input contains three integers n,m,q (1≤n,m,q≤105), separated by a single space.
Next n lines contain integers wi (1≤wi≤109).
Next m lines contain pairs of space-separated integers aj and bj (1≤aj,bj≤n,aj≠bj).
It is guaranteed that there is at most one road connecting the same pair of cities. There is always at least one valid route between any two cities.
Next q lines each describe a query. The format is "C a w" or "A a b" (1≤a,b≤n,1≤w≤109).
Output
For each query of type "A", output the corresponding answer.
Examples
Input
3 3 3 1 2 3 1 2 2 3 1 3 A 2 3 C 1 5 A 2 3
Output
1 2
Input
7 9 4 1 2 3 4 5 6 7 1 2 2 5 1 5 2 3 3 4 2 4 5 6 6 7 5 7 A 2 3 A 6 4 A 6 7 A 3 3
Output
2 1 5 3
Note
For the second sample, an optimal routes are:
From 2 to 3 it is [2,3].
From 6 to 4 it is [6,5,1,2,4].
From 6 to 7 it is [6,5,7].
From 3 to 3 it is [3].
输入样例 复制
输出样例 复制