diff --git a/src/main/java/com/cool/hot100/matrix/Num73.java b/src/main/java/com/cool/hot100/matrix/Num73.java
new file mode 100644
index 0000000..8260a7e
--- /dev/null
+++ b/src/main/java/com/cool/hot100/matrix/Num73.java
@@ -0,0 +1,41 @@
+package com.cool.hot100.matrix;
+
+import java.util.Arrays;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/09/07/0:22
+ * DayNumber 2
+ * Hard 2
+ * Level 3
+ */
+public class Num73 {
+
+    public void setZeroes(int[][] matrix) {
+        boolean[] row = new boolean[matrix.length];
+        boolean[] column = new boolean[matrix[0].length];
+        for (int i = 0; i < matrix.length; i++) {
+            for (int j = 0; j < matrix[0].length; j++) {
+                if (matrix[i][j] == 0) {
+                    row[i] = true;
+                    column[j] = true;
+                }
+            }
+        }
+        for (int i = 0; i < row.length; i++) {
+            if (row[i]) {
+                Arrays.fill(matrix[i], 0);
+            }
+        }
+        for (int i = 0; i < column.length; i++) {
+            if (column[i]) {
+                for(int j=0;j<matrix.length;j++){
+                    matrix[j][i]=0;
+                }
+            }
+        }
+    }
+
+}