Created
August 14, 2020 03:51
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class Solution | |
def reverse_integer(x) | |
# for the last result | |
sign = x < 0 ? -1 : 1 | |
x_clone = x.abs.dup | |
x_result = 0 | |
while x_clone > 0 | |
x_result = (x_result * 10) + x_clone % 10 | |
x_clone /= 10 | |
end | |
# such as 123 | |
# 0 3 12 | |
# 30 2 1 | |
# 32 1 0 | |
x_result = x_result * sign | |
two_pow_31 = 2**31 | |
x_result < two_pow_31 - 1 && x_result > two_pow_31*-1 ? x_result : 0 | |
end | |
def reverse(x) | |
copy = x.dup | |
result = copy.to_s.reverse.to_i | |
result = -result if x < 0 | |
return 0 if result < -2**31 || result > 2**31 - 1 | |
result | |
end | |
end |
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