pascals-triangle

pascals-triangle/sol.rs

@@ -0,0 +1,16 @@
+impl Solution {
+    pub fn generate(num_rows: i32) -> Vec<Vec<i32>> {
+        let mut rows = vec![vec![1]];
+        for row_idx in (1usize..num_rows as usize) {
+            // Could do this with .window(2), adding the two elements of each window,
+            // but that's a bit fussy in this case I think.
+            let mut row = vec![1];
+            for idx in (0usize..(rows[row_idx-1].len()-1)) {
+                row.push(rows[row_idx-1][idx]+rows[row_idx-1][idx+1]);
+            }
+            row.push(1);
+            rows.push(row);
+        }
+        rows
+    }
+}