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DSA_Problems/LeetCode/0008_StringToInteger.cpp at main · lakshitcodes/DSA_Problems · GitHub
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0008_StringToInteger.cpp
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0008_StringToInteger.cpp
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#
include
<
bits/stdc++.h
>
using
namespace
std
;
//
Question Link : https://leetcode.com/problems/string-to-integer-atoi/description/
class
Solution
{
public:
int
myAtoi
(string s)
{
std::ios_base::sync_with_stdio
(
false
);
std::cin.
tie
(
NULL
);
long
long
ans =
0
;
int
idx =
0
;
int
n = s.
length
();
while
(idx < n && s[idx] ==
'
'
)
{
idx++;
}
bool
negative =
false
;
bool
positive =
false
;
if
(s[idx] ==
'
+
'
)
{
idx++;
positive =
true
;
}
if
(s[idx] ==
'
-
'
)
{
idx++;
negative =
true
;
}
if
(positive && negative)
{
return
0
;
}
for
(; idx < n; idx++)
{
if
(s[idx] >=
'
0
'
&& s[idx] <=
'
9
'
)
{
if
(ans >
INT_MAX
)
{
break
;
}
ans *=
10
;
ans += s[idx] -
'
0
'
;
}
else
{
break
;
}
}
if
(negative)
{
ans *= -
1
;
}
if
(ans >
INT_MAX
)
{
ans =
INT_MAX
;
}
if
(ans <
INT_MIN
)
{
ans =
INT_MIN
;
}
return
ans;
}
};
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