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CSES Problem Set

Forbidden Cities


Task | Statistics


CSES - Forbidden CitiesCSES - Forbidden Cities

Time limit:1.00 s Memory limit:512 MB

There are $n$ cities and $m$ roads between them. Kaaleppi is currently in city $a$ and wants to travel to city $b$.

However, there is a problem: Kaaleppi has recently robbed a bank in city $c$ and can't enter the city, because the local police would catch him. Your task is to find out if there is a route from city $a$ to city $b$ that does not visit city $c$.

As an additional challenge, you have to process $q$ queries where $a$, $b$ and $c$ vary.

Input

The first input line has three integers $n$, $m$ and $q$: the number of cities, roads and queries. The cities are numbered $1,2,\dots,n$.

Then, there are $m$ lines describing the roads. Each line has two integers $a$ and $b$: there is a road between cities $a$ and $b$. Each road is bidirectional.

Finally, there are $q$ lines describing the queries. Each line has three integers $a$, $b$ and $c$: is there a route from city $a$ to city $b$ that does not visit city $c$?

You can assume that there is a route between any two cities.

Output

For each query, print "YES", if there is such a route, and "NO" otherwise.

Constraints
Example

Input:
5 6 3
1 2
1 3
2 3
2 4
3 4
4 5
1 4 2
3 5 4
3 5 2


Output:
YES
NO
YES