git reimport

archive/2016.08/2016.08.27 - unsorted/Hanoi.java

@@ -0,0 +1,39 @@
+package chelper;
+
+import io.InputReader;
+import io.OutputWriter;
+
+public class Hanoi {
+  public void solve(int testNumber, InputReader in, OutputWriter out) {
+    int n = in.nextInt();
+    int[] a = new int[n];
+
+    String s = in.nextString();
+    for (int i = 0; i < n; i++) {
+      a[i] = s.charAt(i) - 'A';
+    }
+
+    for (int i = n - 1; i >= 0; i--) {
+      if (a[i] == 2) {
+        out.println("NO");
+        return;
+      }
+
+      if (a[i] == 1) {
+        for (int j = 0; j < n; j++) {
+          if (a[j] < 2) {
+            a[j] = (1 + a[j]) % 2;
+          }
+        }
+      }
+
+      for (int j = 0; j < n; j++) {
+        if (a[j] > 1) {
+          a[j] = 1 + a[j] % 2;
+        }
+      }
+    }
+
+    out.println("YES");
+  }
+}