remove dulplicate exe

src/main/java/lintcode/easy/LintCode_0056_TwoSum.java

-package lintcode.easy;
-
-import java.util.HashMap;
-import java.util.Map;
-
-// https://www.lintcode.com/problem/56/
-public class LintCode_0056_TwoSum {
-    public int[] twoSum(int[] numbers, int target) {
-        // write your code here
-        int[] result = new int[2];
-        Map<Integer,Integer> map = new HashMap<>();
-        for (int i = 0; i < numbers.length; i++) {
-            if (map.containsKey(target - numbers[i])) {
-                return new int[]{ map.get(target - numbers[i]),i};
-            } else {
-                map.put(numbers[i],i);
-            }
-        }
-        return result;
-    }
-}