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284.java
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284.java
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__________________________________________________________________________________________________
sample 45 ms submission
class PeekingIterator implements Iterator<Integer> {
Integer temp;
Iterator<Integer> iterator;
public PeekingIterator(Iterator<Integer> iterator) {
// initialize any member here.
this.iterator = iterator;
}
// Returns the next element in the iteration without advancing the iterator.
public Integer peek() {
if (temp == null) {
temp = iterator.next();
}
return temp;
}
// hasNext() and next() should behave the same as in the Iterator interface.
// Override them if needed.
@Override
public Integer next() {
if (temp == null) {
return iterator.next();
} else {
Integer result = temp;
temp = null;
return result;
}
}
@Override
public boolean hasNext() {
if (temp != null) {
return true;
}
return iterator.hasNext();
}
}
__________________________________________________________________________________________________
sample 34216 kb submission
// Java Iterator interface reference:
// https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html
class PeekingIterator implements Iterator<Integer> {
boolean peeking;
int peeked;
Iterator<Integer> iterator;
public PeekingIterator(Iterator<Integer> iterator) {
// initialize any member here.
peeking = false;
this.iterator = iterator;
}
// Returns the next element in the iteration without advancing the iterator.
public Integer peek() {
if (peeking) return peeked;
else {
peeking = true;
peeked = iterator.next();
return peeked;
}
}
// hasNext() and next() should behave the same as in the Iterator interface.
// Override them if needed.
@Override
public Integer next() {
if (peeking) {
peeking = false;
return peeked;
} else {
return iterator.next();
}
}
@Override
public boolean hasNext() {
if (peeking) {
return true;
} else {
return iterator.hasNext();
}
}
}
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