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package code;

import java.util.HashMap;

/*
 * 454. 4Sum II
 * 40
 * Medium
 * Hash Table, Binary Search
 * 
 *      2SumHashmap
 *      42
 * Tips
 */
public class lc454 {
    public int fourSumCount(int[] A, int[] B, int[] C, int[] D) {
        HashMap hm = new HashMap();
        int res=0;
        for(int i=0; i
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