| # | Title | Solutions | Video | Difficulty | Tag

|-----|----------------|---------------|--------|-------------|-------------

|1726|[Tuple with Same Product](https://leetcode.com/problems/tuple-with-same-product/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1726.java)||Medium|Array|

|1725|[Number Of Rectangles That Can Form The Largest Square](https://leetcode.com/problems/number-of-rectangles-that-can-form-the-largest-square/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1725.java)||Easy|Greedy|

|1721|[Swapping Nodes in a Linked List](https://leetcode.com/problems/swapping-nodes-in-a-linked-list/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1721.java)||Medium|LinkedList|

|1720|[Decode XORed Array](https://leetcode.com/problems/decode-xored-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1720.java)||Easy|Bit Manipulation|

packagecom.fishercoder.solutions;

importjava.util.HashMap;

importjava.util.Map;

publicclass_1726 {

publicstaticclassSolution1 {

publicinttupleSameProduct(int[]nums) {

Map<Integer,Integer>map =newHashMap<>();

intcount =0;

for (inti =0;i <nums.length -1;i++) {

for (intj =i +1;j <nums.length;j++) {

intproduct =nums[i] *nums[j];

count +=8 *map.getOrDefault(product,0);

map.put(product,map.getOrDefault(product,0) +1);

}

}

returncount;

}

}

}

packagecom.fishercoder;

importcom.fishercoder.solutions._1726;

importorg.junit.BeforeClass;

importorg.junit.Test;

importstaticorg.junit.Assert.assertEquals;

publicclass_1726Test {

privatestatic_1726.Solution1solution1;

publicstaticvoidsetup() {

solution1 =new_1726.Solution1();

}

publicvoidtest1() {

assertEquals(8,solution1.tupleSameProduct(newint[]{2,3,4,6}));

}

publicvoidtest2() {

assertEquals(16,solution1.tupleSameProduct(newint[]{1,2,4,5,10}));

}

publicvoidtest3() {

assertEquals(40,solution1.tupleSameProduct(newint[]{2,3,4,6,8,12}));

}

publicvoidtest4() {

assertEquals(0,solution1.tupleSameProduct(newint[]{2,3,5,7}));

}

publicvoidtest5() {

assertEquals(128,solution1.tupleSameProduct(newint[]{1,2,3,4,6,8,12,24}));

}

}