git reimport

archive/2017.01/2017.01.07 - unsorted/B.java

@@ -0,0 +1,25 @@
+package chelper;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import io.InputReader;
+import io.OutputWriter;
+
+public class B {
+  public void solve(int testNumber, InputReader in, OutputWriter out) {
+    int n = in.nextInt();
+    String s = in.nextString();
+    Set<Integer> set = new HashSet<>();
+
+    for (char c : s.toCharArray()) {
+      set.add((int)c);
+    }
+
+    if (set.size() != n) {
+      out.println("NO");
+    } else {
+      out.println("YES");
+    }
+  }
+}