Medium

27.5%

You are given N pairs of numbers. In every pair, the first number is always smaller than the second number. A pair (c, d) can follow another pair (a, b) if b < c. Chain of pairs can be formed in this fashion. Your task is to complete the function **maxChainLen** which returns an integer denoting the longest chain which can be formed from a given set of pairs.

**Input:**

The first line of input contains an integer T denoting the no of test cases then T test cases follow .Then T test cases follow . The first line of input contains an integer N denoting the no of pairs . In the next line are 2*N space separated values denoting N pairs.

**Output:**

For each test case output will be the length of the longest chain formed.

**Constraints:**

1<=T<=100

1<=N<=100

**Example(To be used only for expected output):
Input**

2

5

5 24 39 60 15 28 27 40 50 90

2

5 10 1 11

3

1

(i) the given pairs are {{5, 24}, {39, 60}, {15, 28}, {27, 40}, {50, 90} },the longest chain that can be formed is of length 3, and the chain is {{5, 24}, {27, 40}, {50, 90}}

(ii) The max length chain possible is only of length one.