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leetcode-algorithms/src/SingleNumber.java at master · anishLearnsToCode/leetcode-algorithms · GitHub
anishLearnsToCode
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leetcode-algorithms
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src
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SingleNumber.java
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leetcode-algorithms
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src
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SingleNumber.java
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import
java
.
util
.
HashSet
;
import
java
.
util
.
Set
;
public
class
SingleNumber
{
public
int
singleNumber
(
int
[]
array
) {
Set
<
Integer
>
numbers
=
new
HashSet
<>();
for
(
int
element
:
array
) {
if
(
numbers
.
contains
(
element
)) {
numbers
.
remove
(
element
);
}
else
{
numbers
.
add
(
element
);
}
}
for
(
int
number
:
numbers
) {
return
number
;
}
return
-
1
;
}
}
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