public class TwoSum {
List list = new ArrayList();
// Add the number to an internal data structure.
public void add(int number) {
list.add(number);
}
// Find if there exists any pair of numbers which sum is equal to the value.
public boolean find(int value) {
HashSet<Integer> set = new HashSet<Integer>();
for(int i = 0; i < list.size(); i++) {
if(set.contains(value - list.get(i))) {
return true;
}
set.add(list.get(i));
}
return false;
}
}
// Your TwoSum object will be instantiated and called as such:
// TwoSum twoSum = new TwoSum();
// twoSum.add(number);
// twoSum.find(value);
Shawngbk
commented
7 years ago
public class TwoSum { List list = new ArrayList();
}
// Your TwoSum object will be instantiated and called as such: // TwoSum twoSum = new TwoSum(); // twoSum.add(number); // twoSum.find(value);