add 593 java

yennanliu · Dec 20, 2024 · 85def7f · 85def7f
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diff --git a/README.md b/README.md
@@ -713,7 +713,7 @@
 553 | [Optimal Division](https://leetcode.com/problems/optimal-division/) |[Python](./leetcode_python/Math/optimal-division.py)| _O(n)_ | _O(1)_ | Medium |string, math, `amazon`| OK* (4) 
 573 | [Squirrel Simulation](https://leetcode.com/problems/squirrel-simulation/) | [Python](./leetcode_python/Math/squirrel-simulation.py) | _O(n)_ | _O(1)_ | Medium |🔒| AGAIN (not start)
 592 | [Fraction Addition and Subtraction](https://leetcode.com/problems/fraction-addition-and-subtraction/) | [Python](./leetcode_python/Math/fraction-addition-and-subtraction.py)| _O(nlogx)_ | _O(n)_ | Medium || AGAIN 
-593 | [Valid Square](https://leetcode.com/problems/valid-square/) | [Python](./leetcode_python/Math/valid-square.py)| _O(1)_ | _O(1)_ | Medium || AGAIN 
+593 | [Valid Square](https://leetcode.com/problems/valid-square/) | [Python](./leetcode_python/Math/valid-square.py), [Java](./leetcode_java/src/main/java/LeetCodeJava/Math/ValidSquare.java)| _O(1)_ | _O(1)_ | Medium |google, math| AGAIN 
 598 | [Range Addition II](https://leetcode.com/problems/range-addition-ii/) | [Python](./leetcode_python/Math/range-addition-ii.py) | _O(p)_ | _O(1)_ | Easy || AGAIN 
 625 | [Minimum Factorization](https://leetcode.com/problems/minimum-factorization/) | [Python](./leetcode_python/Math/minimum-factorization.py) | _O(loga)_ | _O(1)_ | Medium |🔒| OK*
 628| [Maximum Product of Three Numbers](https://leetcode.com/problems/maximum-product-of-three-numbers/) | [Python](./leetcode_python/Math/maximum-product-of-three-numbers.py)  | _O(n)_ | _O(1)_ | Easy |`amazon`| OK (2) 

diff --git a/data/progress.md b/data/progress.md
@@ -3,7 +3,6 @@
 # 2024-12-20
 - https://github.com/yennanliu/CS_basics/blob/master/doc/Leetcode_company_frequency-master/Google%206months-%20LeetCode.pdf
 
-
 # 2024-12-15
 - https://github.com/yennanliu/CS_basics/blob/master/doc/Leetcode_company_frequency-master/Google%206months-%20LeetCode.pdf
 

diff --git a/data/progress.txt b/data/progress.txt
@@ -1,4 +1,4 @@
-20241220: 815,871
+20241220: 815,871,593
 20241215: 1109
 20241214: 560,523
 20241208: 304,853,325

diff --git a/data/to_review.txt b/data/to_review.txt
@@ -1,10 +1,10 @@
-2025-02-13 -> ['815,871']
+2025-02-13 -> ['815,871,593']
 2025-02-08 -> ['1109']
 2025-02-07 -> ['560,523']
 2025-02-01 -> ['304,853,325']
 2025-01-26 -> ['370(todo)']
 2025-01-24 -> ['34,767']
-2025-01-23 -> ['815,871']
+2025-01-23 -> ['815,871,593']
 2025-01-20 -> ['722,380']
 2025-01-19 -> ['33,81']
 2025-01-18 -> ['1109']
@@ -13,21 +13,21 @@
 2025-01-15 -> ['004(todo),34(todo),162(todo),275(todo)']
 2025-01-14 -> ['986(todo),1229(todo),1868(todo),80(todo),209(todo),283(todo),360(todo),713(todo),532(todo),611(todo)']
 2025-01-11 -> ['304,853,325', '394']
-2025-01-10 -> ['815,871', '833,950']
+2025-01-10 -> ['815,871,593', '833,950']
 2025-01-05 -> ['1109', '370(todo)']
 2025-01-04 -> ['560,523', '53,210,207']
 2025-01-03 -> ['34,767', '444']
-2025-01-02 -> ['815,871', '1188,130,855(again)']
+2025-01-02 -> ['815,871,593', '1188,130,855(again)']
 2024-12-30 -> ['722,380']
 2024-12-29 -> ['304,853,325', '33,81']
-2024-12-28 -> ['815,871', '1109', '900']
+2024-12-28 -> ['815,871,593', '1109', '900']
 2024-12-27 -> ['560,523', '253', '26,27', '802,1197,26']
 2024-12-26 -> ['776,31']
-2024-12-25 -> ['815,871', '004(todo),34(todo),162(todo),275(todo)']
+2024-12-25 -> ['815,871,593', '004(todo),34(todo),162(todo),275(todo)']
 2024-12-24 -> ['986(todo),1229(todo),1868(todo),80(todo),209(todo),283(todo),360(todo),713(todo),532(todo),611(todo)']
-2024-12-23 -> ['815,871', '1109', '370(todo)']
-2024-12-22 -> ['815,871', '560,523']
-2024-12-21 -> ['815,871', '304,853,325', '34,767', '394', '855,846']
+2024-12-23 -> ['815,871,593', '1109', '370(todo)']
+2024-12-22 -> ['815,871,593', '560,523']
+2024-12-21 -> ['815,871,593', '304,853,325', '34,767', '394', '855,846']
 2024-12-20 -> ['1109', '833,950', '932']
 2024-12-19 -> ['560,523']
 2024-12-18 -> ['1109', '951,792']

diff --git a/leetcode_java/src/main/java/LeetCodeJava/Math/ValidSquare.java b/leetcode_java/src/main/java/LeetCodeJava/Math/ValidSquare.java
@@ -0,0 +1,111 @@
+package LeetCodeJava.Math;
+
+// https://leetcode.com/problems/valid-square/description/
+
+import java.util.Arrays;
+
+/**
+ * 593. Valid Square Attempted Medium Topics Companies Given the coordinates of four points in 2D
+ * space p1, p2, p3 and p4, return true if the four points construct a square.
+ *
+ * <p>The coordinate of a point pi is represented as [xi, yi]. The input is not given in any order.
+ *
+ * <p>A valid square has four equal sides with positive length and four equal angles (90-degree
+ * angles).
+ *
+ * <p>Example 1:
+ *
+ * <p>Input: p1 = [0,0], p2 = [1,1], p3 = [1,0], p4 = [0,1] Output: true Example 2:
+ *
+ * <p>Input: p1 = [0,0], p2 = [1,1], p3 = [1,0], p4 = [0,12] Output: false Example 3:
+ *
+ * <p>Input: p1 = [1,0], p2 = [-1,0], p3 = [0,1], p4 = [0,-1] Output: true
+ *
+ * <p>Constraints:
+ *
+ * <p>p1.length == p2.length == p3.length == p4.length == 2 -104 <= xi, yi <= 104
+ */
+public class ValidSquare {
+
+  // V0
+  // TODO : implement
+  //    public boolean validSquare(int[] p1, int[] p2, int[] p3, int[] p4) {
+  //
+  //    }
+
+  // V1
+  // https://leetcode.com/problems/valid-square/editorial/
+  // IDEA : BRUTE FORCE
+  public double dist(int[] p1, int[] p2) {
+    return (p2[1] - p1[1]) * (p2[1] - p1[1]) + (p2[0] - p1[0]) * (p2[0] - p1[0]);
+  }
+
+  public boolean check(int[] p1, int[] p2, int[] p3, int[] p4) {
+    return dist(p1, p2) > 0
+        && dist(p1, p2) == dist(p2, p3)
+        && dist(p2, p3) == dist(p3, p4)
+        && dist(p3, p4) == dist(p4, p1)
+        && dist(p1, p3) == dist(p2, p4);
+  }
+
+  public boolean validSquare_1(int[] p1, int[] p2, int[] p3, int[] p4) {
+    int[][] p = {p1, p2, p3, p4};
+    return checkAllPermutations(p, 0);
+  }
+
+  boolean checkAllPermutations(int[][] p, int l) {
+    if (l == 4) {
+      return check(p[0], p[1], p[2], p[3]);
+    } else {
+      boolean res = false;
+      for (int i = l; i < 4; i++) {
+        swap(p, l, i);
+        res |= checkAllPermutations(p, l + 1);
+        swap(p, l, i);
+      }
+      return res;
+    }
+  }
+
+  public void swap(int[][] p, int x, int y) {
+    int[] temp = p[x];
+    p[x] = p[y];
+    p[y] = temp;
+  }
+
+  // V2
+  // https://leetcode.com/problems/valid-square/editorial/
+  // IDEA : Using Sorting
+  public double dist_2(int[] p1, int[] p2) {
+    return (p2[1] - p1[1]) * (p2[1] - p1[1]) + (p2[0] - p1[0]) * (p2[0] - p1[0]);
+  }
+
+  public boolean validSquare_2(int[] p1, int[] p2, int[] p3, int[] p4) {
+    int[][] p = {p1, p2, p3, p4};
+    Arrays.sort(p, (l1, l2) -> l2[0] == l1[0] ? l1[1] - l2[1] : l1[0] - l2[0]);
+    return dist_2(p[0], p[1]) != 0
+        && dist_2(p[0], p[1]) == dist_2(p[1], p[3])
+        && dist_2(p[1], p[3]) == dist_2(p[3], p[2])
+        && dist_2(p[3], p[2]) == dist_2(p[2], p[0])
+        && dist_2(p[0], p[3]) == dist_2(p[1], p[2]);
+  }
+
+  // V3
+  // https://leetcode.com/problems/valid-square/editorial/
+  // IDEA : Checking every case
+  public double dist_3(int[] p1, int[] p2) {
+    return (p2[1] - p1[1]) * (p2[1] - p1[1]) + (p2[0] - p1[0]) * (p2[0] - p1[0]);
+  }
+
+  public boolean check_3(int[] p1, int[] p2, int[] p3, int[] p4) {
+    return dist_3(p1, p2) > 0
+        && dist_3(p1, p2) == dist_3(p2, p3)
+        && dist_3(p2, p3) == dist_3(p3, p4)
+        && dist_3(p3, p4) == dist_3(p4, p1)
+        && dist_3(p1, p3) == dist_3(p2, p4);
+  }
+
+  public boolean validSquare_3(int[] p1, int[] p2, int[] p3, int[] p4) {
+    return check_3(p1, p2, p3, p4) || check_3(p1, p3, p2, p4) || check_3(p1, p2, p4, p3);
+  }
+}
diff --git a/leetcode_java/src/main/java/dev/workspace6.java b/leetcode_java/src/main/java/dev/workspace6.java
@@ -171,4 +171,56 @@ public int numBusesToDestination(int[][] routes, int source, int target) {
         return -1;
     }
 
+    // LC 593
+    // https://leetcode.com/problems/valid-square/
+    // 2.05 pm - 2.20 pm
+    /**
+     *  Idea 1)  math
+     *
+     *   A----B
+     *   |     |
+     *   C----D
+     *
+     *
+     *  -> so, dist(A,B) ==  dist(C,D)
+     *
+     *  step 1) create a check func
+     *   1) check if same dist
+     *   2) check if "90 degree"
+     *
+     *  step 2) go through each point, and check "if at least 2 combinations"
+     *          fit the check logic, if any violation, return false directly
+     *
+     *  step 3) return true
+     *
+     */
+    public boolean validSquare(int[] p1, int[] p2, int[] p3, int[] p4) {
+
+        List<int[]> list = new ArrayList<>();
+        list.add(p1);
+        list.add(p2);
+        list.add(p3);
+        list.add(p4);
+
+        for (int i = 0; i < list.size(); i++){
+            int violationCnt = 0;
+            for (int j = 0; j < list.size(); j++){
+                if (i != j){
+                    if (!canBuildSqaure(list.get(i), list.get(j))){
+                        violationCnt += 1;
+                    }
+                }
+                if (violationCnt > 1){
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private boolean canBuildSqaure(int[] x1, int[] x2){
+
+        return true;
+    }
+
 }