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Given a string, find the number of pairs of characters that are same. Pairs (s[i], s[j]), (s[j], s[i]), (s[i], s[i]), (s[j], s[j]) should be considered different.

**Example 1:**

**Input:**
S = "air"
**Output:** 3
**Explanation**: 3 pairs that are equal:
(S[0], S[0]), (S[1], S[1]) and (S[2], S[2])

â€‹**Example 2:**

**Input**:
S = "aa"
**Output:** 4
**Explanation**: 4 pairs that are equal:
(S[0], S[0]), (S[0], S[1]), (S[1], S[0])
and (S[1], S[1])

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **equalPairs() **which takes the string S as input and returns the number of equal pairs as described in the problem description.

**Expected Time Complexity: **O(|S|).

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

**Constraints:**

1<=|S|<=10^{5}

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Count number of equal pairs in a string

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