Update 0001_Two_Sum.java

Author: Yonghee9106

Java/0001_Two_Sum.java

@@ -1,43 +1,43 @@
-//import java.util.Arrays;
-//import java.util.HashMap;
-//import java.util.Map;
+// import java.util.Arrays;
+// import java.util.HashMap;
+// import java.util.Map;
 
 class Solution {
 	public static int[] twoSum(int[] nums, int target) {
-	    int[] result = new int[2];                                      	// instantiate new array
+	    int[] result = new int[2];                                      	// instantiate new array which will contain twoSum result
 	    int diff;
 
-	    Map<Integer, Integer> diff_Map = new HashMap<Integer, Integer>();   // create hashmap (key: 'nums' element, value: index)
+	    Map<Integer, Integer> diff_Map = new HashMap<Integer, Integer>();   // create hashmap (key: nums element, value: index)
 
-	    for(int i=0; i<nums.length; i++) {					// for all elements in the 'nums' array
+	    for(int i=0; i<nums.length; i++) {					// for all elements in the nums array
 	        diff = target - nums[i];
 
-	        if(diff_Map.containsKey(diff)) {                                // if the 'diff' exists in the 'map'
+	        if(diff_Map.containsKey(diff)) {                                // if the diff exists in the diff_Map
 	            result[0] = diff_Map.get(diff);				// result[0] = diff's index
 	            result[1] = i;						// result[1] = current index
 
 	            return result;                                          	// diff's index and current index are two sum combination
 	        }
-	        diff_Map.put(nums[i], i);					// if the 'diff' deosn't exist, add nums[i] as a key and index as a value
+	        diff_Map.put(nums[i], i);					// if the diff deosn't exist, add nums[i] as a key and index as a value
 	    }
 	    return result;
 	}
 
-//	public static void main(String[] args) {
-//		// Example 1, output: [0, 1]
-//		int[] nums1 = {2, 7 ,11, 15};
-//		int[] example1 = twoSum(nums1, 9);
-//		
-//		// Example 2, output: [1,2]
-//		int[] nums2 = {3, 2, 4};
-//		int[] example2 = twoSum(nums2, 6);
-//		
-//		// Example 3, output: [0,1]
-//		int[] nums3 = {3, 3};
-//		int[] example3 = twoSum(nums3, 6);
-//		
-//		System.out.println(Arrays.toString(example1));			// [0, 1]
-//		System.out.println(Arrays.toString(example2));			// [1, 2]
-//		System.out.println(Arrays.toString(example3));			// [0, 1]
-//	}
+	// public static void main(String[] args) {
+	// 	// Example 1, output: [0,1]
+	// 	int[] nums1 = {2, 7 ,11, 15};
+	// 	int[] example1 = twoSum(nums1, 9);
+		
+	// 	// Example 2, output: [1,2]
+	// 	int[] nums2 = {3, 2, 4};
+	// 	int[] example2 = twoSum(nums2, 6);
+		
+	// 	// Example 3, output: [0,1]
+	// 	int[] nums3 = {3, 3};
+	// 	int[] example3 = twoSum(nums3, 6);
+		
+	// 	System.out.println(Arrays.toString(example1));			// [0,1]
+	// 	System.out.println(Arrays.toString(example2));			// [1,2]
+	// 	System.out.println(Arrays.toString(example3));			// [0,1]
+	// }
 }