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Given two arrays **X** and **Y** of positive integers, find the number of pairs such that **x ^{y} > y^{x}**

**Input**:
M = 3, X[] = [2 1 6]
N = 2, Y[] = [1 5]
**Output**: 3
**Explanation**:
The pairs which follow x^{y} > y^{x} are
as such: 2^{1} > 1^{2}, 2^{5} > 5^{2} and 6^{1} > 1^{6 .}

**Example 2:**

**Input**:
M = 4, X[] = [2 3 4 5]
N = 3, Y[] = [1 2 3]
**Output**: 5
**Explanation**:
The pairs for the given input are
2^{1 }> 1^{2} , 3^{1} > 1^{3 }, 3^{2} > 2^{3} , 4^{1} > 1^{4} ,
5^{1} > 1^{5 }.

**Your Task:**

This is a function problem. You only need to complete the function** countPairs() **that takes **X, Y, M, N** as **parameters **and returns the total number of pairs.

**Expected Time Complexity:** O((N + M)log(N)).

**Expected Auxiliary Space:** O(1).

**Constraints:**

1 ≤ M, N ≤ 10^{5}

1 ≤ X[i], Y[i] ≤ 10^{3}

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Number of pairs

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