In many competitive programming problems, we need to find greatest common divisor also known as gcd. Euclids algorithm to find gcd has been discussed here
C++ has the built-in function for calculating GCD. This function is present in
__gcd(m, n) Parameter : m, n Return Value : 0 if both m and n are zero, else gcd of m and n.
gcd(6, 20) = 2
Note: If either M or N is not an integer type, or if either is (possibly cv-qualified) bool, the program is ill-formed. Also, If either |m| or |n| is not representable as a value of type std::common_type_t
Error, As the data type float is not supported by std::gcd.
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