POLQUERY - Police Query
To help capture criminals on the run, the police are introducing a new computer system. The area covered by the police contains N cities and E bidirectional roads connecting them. The cities are labelled 1 to N. The police often want to catch criminals trying to get from one city to another. Inspectors, looking at a map, try to determine where to set up barricades and roadblocks.
The new computer system should answer the following two types of queries:
1. Consider two cities A and B, and a road connecting cities G1 and G2. Can the criminals get from city A to city B if that one road is blocked and the criminals can't use it?
2. Consider three cities A, B and C. Can the criminals get from city A to city B if the entire city C is cut off and the criminals can't enter that city?
Write a program that implements the described system.
The first line contains two integers N and E (2 ≤ N ≤ 105, 1 ≤ E ≤ 5*105), the number of cities and roads. Each of the following E lines contains two distinct integers between 1 and N – the labels of two cities connected by a road. There will be at most one road between any pair of cities.
The following line contains the integer Q (1 ≤ Q ≤ 105), the number of queries the system is being tested on. Each of the following Q lines contains either four or five integers. The first of these integers is the type of the query – 1 or 2.
If the query is of type 1, then the same line contains four more integers A, B, G1 and G2 as described earlier. A and B will be different. G1 and G2 will represent an existing road.
If the query is of type 2, then the same line contains three more integers A, B and C. A, B and C will be distinct integers.
The test data will be such that it is initially possible to get from each city to every other city.
Output the answers to all Q queries, one per line. The answer to a query can be da (yes) or ne (no).
1 5 13 1 2
1 6 2 1 4
1 13 6 7 8
2 13 6 7
2 13 6 8
Ja Issa Tai:
sample input contains 5 queries, sample output contains only 4?
da = yes, ne = no
The output (in your submitted program) must be "da" or "ne" (don't mind the sample).
Resource should be COI 07.
"The answer to a query