Merge pull request neetcode-gh#3310 from AmitSaha15/0059-spiral-matrix-ii

Create 0059-spiral-matrix-ii.java

Author: a93a

java/0059-spiral-matrix-ii.java

@@ -0,0 +1,30 @@
+class Solution {
+    public int[][] generateMatrix(int n) {
+        int[][] ans = new int[n][n];
+
+        int r1=0, r2=n-1;
+        int c1=0, c2=n-1;
+        int elem = 1;
+        while(r2>=r1 && c2>=c1){
+            for(int i=c1; i<=c2; i++){
+                ans[r1][i] = elem++;
+            }
+            for(int j=r1+1; j<=r2-1; j++){
+                ans[j][c2] = elem++;
+            }
+            if(r2>r1 && c2>c1){
+                for (int i = c2; i >= c1; i--){
+                    ans[r2][i] = elem++;
+                }
+                for (int j = r2-1; j>=r1+1; j--){
+                    ans[j][c1] = elem++;
+                }
+            }
+            r1++;
+            r2--;
+            c1++;
+            c2--;
+        }
+        return ans;
+    }
+}