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leetcode-algorithms/src/NumberOf1Bit.java at master · anishLearnsToCode/leetcode-algorithms · GitHub
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leetcode-algorithms
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src
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NumberOf1Bit.java
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leetcode-algorithms
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src
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NumberOf1Bit.java
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public
class
NumberOf1Bit
{
public
int
hammingWeight
(
int
n
) {
if
(
n
==
0
)
return
0
;
int
count
=
0
;
//revert first bit if it's 1 to make the number positive
int
pos_n
= (
n
>
0
) ?
n
:
n
^(
1
<<
31
);
for
(
int
i
=
1
;
i
>
0
&&
i
<=
pos_n
;
i
=
i
<<
1
) {
if
((
i
^
n
) <
n
) {
count
++;
}
}
return
count
+ (
n
>
0
?
0
:
1
);
}
}
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