git reimport

archive/2017.04/2017.04.08 - unsorted/TaskA.java

@@ -0,0 +1,49 @@
+package chelper;
+
+import io.InputReader;
+import io.OutputWriter;
+import misc.GCJSolution;
+
+public class TaskA extends GCJSolution {
+
+  public void solve(int testNumber, InputReader in, OutputWriter out) {
+    wrapSolve(testNumber, in, out);
+  }
+
+  @Override
+  public void solve(int testNumber) {
+    char[] s = in.nextString().toCharArray();
+    int k = in.nextInt();
+
+    int n = s.length;
+
+    boolean[] a = new boolean[n];
+    for (int i = 0; i < n; i++) {
+      a[i] = s[i] == '+';
+    }
+
+    int ans = 0;
+
+    for (int i = 0; i + k - 1 < n; i++) {
+      if (!a[i]) {
+        for (int j = 0; j < k; j++) {
+          a[i + j] ^= true;
+        }
+        ans++;
+      }
+    }
+
+    boolean ok = true;
+
+    for (int i = 0; i < n; i++) {
+      ok &= a[i];
+    }
+
+    if (ok) {
+      out.println(ans);
+    } else {
+      out.println("IMPOSSIBLE");
+    }
+
+  }
+}