leetcode/cpp/8/Solution.cpp at master · hash3r/leetcode · GitHub

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classSolution {
public:
intmyAtoi(string str) {
longlong res=0;
int sign=1;
int i=0;
for(;i<str.size();i++) {
if (str[i]!='') break;
 }
if (str[i]=='-') {
 sign=-1;
 i++;
 } elseif (str[i]=='+') {
 i++;
 }
for(;i<str.size();i++) {
auto c=str[i];
if (0<=c-'0' && c-'9'<=9) {
 res=res*10 + (c-'0');
if (res*sign >= INT_MAX) returnINT_MAX;
if (res*sign <= INT_MIN) returnINT_MIN;
 } else {
break;
 }
 }
return res*sign;
 }
};