Upload files to "java/reverse"

java/reverse/FastScanner.java

@@ -0,0 +1,71 @@
+package reverse;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * @author Nikita Doschennikov (me@fymio.us)
+ */
+public class FastScanner {
+
+    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    String line = null;
+    int pos = 0;
+
+    boolean hasNextLine() throws IOException {
+        if (line != null && pos < line.length()) return true;
+        line = br.readLine();
+        pos = 0;
+        return line != null;
+    }
+
+    boolean hasNextInt() {
+        if (line == null) return false;
+        while (
+            pos < line.length() &&
+            (Character.isWhitespace(line.charAt(pos)) ||
+                Character.getType(line.charAt(pos)) ==
+                Character.START_PUNCTUATION ||
+                Character.getType(line.charAt(pos)) ==
+                Character.END_PUNCTUATION)
+        ) {
+            pos++;
+        }
+        return (
+            pos < line.length() &&
+            (Character.isDigit(line.charAt(pos)) || line.charAt(pos) == '-')
+        );
+    }
+
+    int nextInt() {
+        while (
+            pos < line.length() &&
+            (Character.isWhitespace(line.charAt(pos)) ||
+                Character.getType(line.charAt(pos)) ==
+                Character.START_PUNCTUATION ||
+                Character.getType(line.charAt(pos)) ==
+                Character.END_PUNCTUATION)
+        ) {
+            pos++;
+        }
+
+        int start = pos;
+        boolean negative = line.charAt(pos) == '-';
+        if (negative) pos++;
+
+        while (pos < line.length() && Character.isDigit(line.charAt(pos))) {
+            pos++;
+        }
+
+        int result = 0;
+        for (int i = negative ? start + 1 : start; i < pos; i++) {
+            result = result * 10 + (line.charAt(i) - '0');
+        }
+        return negative ? -result : result;
+    }
+
+    void nextLine() {
+        pos = line.length();
+    }
+}