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961.java
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961.java
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sample 0 ms submission
class Solution {
public int repeatedNTimes(int[] A) {
HashSet<Integer> table = new HashSet<Integer>();
for (int i=0; i<A.length;i++)
{
if(!table.add(A[i]))
{
return A[i];
}
}
return -1;
}
}
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sample 37284 kb submission
class Solution {
public int repeatedNTimes(int[] A) {
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
for (Integer i: A){
if (map.containsKey(i)){
int values = map.get(i);
values++;
map.put(i, values);
}else{
map.put(i, 1);
}
}
int n = A.length / 2;
return map.keySet()
.stream()
.filter(key-> n == map.get(key))
.findFirst().get();
}
}
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