<doocs>2083.Substrings That Begin and End With the Same Letter_1.py
def numberOfSubstrings( s: str) -> int:
    counter = [0] * 26
    ans = 0
    for c in s:
        i = ord(c) - ord('a')
        counter[i] += 1
        ans += counter[i]
    return ans
def sample_funcname ( var_0 : str ) -> int :
    var_5 = [ 0 ] * 26
    var_6 = 0
    for var_7 in var_0 :
        var_10 = ord ( var_7 ) - ord ( 'a' )
        var_5 [ var_10 ] += 1
        var_6 += var_5 [ var_10 ]
    return var_6
