LeetCode 65: Valid Number
Problem Restatement We are given a string s . We need to return true if s represents a valid number. Otherwise, return false . A valid number can have: A decimal number or an integer Optionally, an exponent part using e or E , followed by an integer The official examples include valid strings such as: "2" "0089" "-0.1" "+3.14" "4." "-.9" "2e10" "-90E3" "3e+7" "+6e-1" "53.5e93" "-123.456e789" And invalid...