Create Rings and Rods.java

varunu28 · web-flow · commit 220ad0ef725b · 2021-12-12T08:19:35.000-08:00
diff --git a/Easy/Rings and Rods.java b/Easy/Rings and Rods.java
@@ -0,0 +1,11 @@
+class Solution {
+  public int countPoints(String rings) {
+    Map<Integer, Set<Character>> map = new HashMap<>();
+    for (int i = 0; i < rings.length(); i += 2) {
+      char ring = rings.charAt(i);
+      int rod = Character.getNumericValue(rings.charAt(i + 1));
+      map.computeIfAbsent(rod, k -> new HashSet()).add(ring);
+    }
+    return (int) map.values().stream().filter(v -> v.size() == 3).count();
+  }
+}
