solves pascals triangle

Author: anishLearnsToCode

src/PascalsTriangle.java

@@ -0,0 +1,28 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class PascalsTriangle {
+    public List<List<Integer>> generate(int numRows) {
+        List<List<Integer>> result = new ArrayList<>();
+        if (numRows == 0) {
+            return result;
+        }
+
+        List<Integer> firstRow = new ArrayList<>();
+        firstRow.add(1);
+        result.add(firstRow);
+
+        for (int row = 1 ; row < numRows ; row++) {
+            List<Integer> list = new ArrayList<>(row + 1);
+            List<Integer> previous = result.get(result.size() - 1);
+            list.add(1);
+            for (int j = 1 ; j < row ; j++) {
+                list.add(previous.get(j - 1) + previous.get(j));
+            }
+            list.add(1);
+            result.add(list);
+        }
+
+        return result;
+    }
+}