Types: N: int, X: List[int], L: List[int]  
Ranges: 1 ≤ N ≤ 100,000, 0 ≤ X[i] ≤ 10^9 (1 ≤ i ≤ N), 1 ≤ L[i] ≤ 10^9 (1 ≤ i ≤ N)  
Addtl Info: X[i] are unique, all values in input are integers