Implement atoi to convert a string to an integer.
Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.
Notes: It is intended for this problem to be specified vaguely (ie, no given input specs). You are responsible to gather all the input requirements up front.
1 class Solution { 2 public: 3 int myAtoi(string str) { 4 long long cur=0; 5 int num=0,i=0; 6 int flag1=0,flag2=0; 7 while(str[i]!='