fix(p2190A): correct edge case logic and handle trailing whitespace

Author: lzwjava

src/main/java/com/lzw/solutions/codeforces/p2190A/Main.java

@@ -24,8 +24,7 @@ void solve() throws IOException {
         int t = Integer.parseInt(in.readLine());
         while (t-- > 0) {
             int n = Integer.parseInt(in.readLine());
-            String s = in.readLine();
-            assert (s.length() == n);
+            String s = in.readLine().trim();
             int i;
             int zero = 0, one = 0;
             for (i = 0; i < n; i++) {
@@ -38,7 +37,6 @@ void solve() throws IOException {
             if (zero == n || one == n) {
                 out.println("Bob");
             } else {
-                out.println("Alice");
                 ArrayList<Integer> positions = new ArrayList<>();
                 for (i = 0; i < n; i++) {
                     char target;
@@ -51,15 +49,20 @@ void solve() throws IOException {
                         positions.add(i);
                     }
                 }
-                int size = positions.size();
-                out.println(size);
-                for (i = 0; i < size; i++) {
-                    if (i != 0) {
-                        out.print(' ');
+                if (positions.size() == 0) {
+                    out.print("Bob");
+                } else {
+                    out.println("Alice");
+                    int size = positions.size();
+                    out.println(size);
+                    for (i = 0; i < size; i++) {
+                        if (i != 0) {
+                            out.print(' ');
+                        }
+                        out.print(positions.get(i) + 1);
                     }
-                    out.print(positions.get(i) + 1);
+                    out.println();
                 }
-                out.println();
             }
         }
     }

src/main/java/com/lzw/solutions/codeforces/p2190A/MainPlus.java

@@ -0,0 +1,45 @@
+package com.lzw.solutions.codeforces.p2190A;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+
+public class MainPlus {
+
+    BufferedReader in;
+    PrintWriter out;
+
+    MainPlus() {
+        in = new BufferedReader(new InputStreamReader(System.in));
+        out = new PrintWriter(System.out);
+    }
+
+    // 100100          100101         10  01  100   101   101010
+    // 000011(1456)    000111(145)    01  01  001   011   000111(1346)
+
+    void solve() throws IOException {
+        int t = Integer.parseInt(in.readLine());
+        while (t-- > 0) {
+            int n = Integer.parseInt(in.readLine());
+            String s = in.readLine();
+            out.println("Alice");
+        }
+    }
+
+    void close() throws IOException {
+        if (in != null) {
+            in.close();
+        }
+        if (out != null) {
+            out.flush();
+            out.close();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        MainPlus main = new MainPlus();
+        main.solve();
+        main.close();
+    }
+}

src/main/resources/codeforces/p2190A/1.in

@@ -3,5 +3,5 @@
 000
 2
 10
-3
-101
+6
+101010