Codeforces Round #157 (Div. 2): C - Little Elephant and Bits

// Codeforces Round #157 (Div. 2):    C - Little Elephant and Bits

import java.io.*;
import java.math.*;
import java.util.*;

//codeforces
public class MainCodeforces1 {
    private static MyScanner in;
    private static PrintStream out;

    public static void main(String[] args) throws IOException {
        // helpers for input/output
        boolean LOCAL_TEST = false;
        // LOCAL_TEST = true;// comment it before submitting
        out = System.out;
        if (LOCAL_TEST) {
            in = new MyScanner("E:\\zin2.txt");
        }
        else {
            boolean usingFileForIO = false;
            if (usingFileForIO) {
                // using input.txt and output.txt as I/O
                in = new MyScanner("input.txt");
                out = new PrintStream("output.txt");
            }
            else {
                in = new MyScanner();
                out = System.out;
            }
        }

        solve();
    }

    private static void solve() throws IOException
    {
        String s = in.nextString();
        char[] c = s.toCharArray();
        StringBuilder ans = new StringBuilder("" + String.valueOf(c[0]));
        for (int i = 1; i < c.length - 1; i++) {
            if (c[i] == '1')
            {
                ans.append(String.valueOf(c[i]));
            }
            else
            {
                for (int j = i + 1; j < c.length; j++) {
                    ans.append(String.valueOf(c[j]));
                }
                break;
            }
        }
        out.println(ans.toString());
    }

    // =====================================
    static class MyScanner {
        Scanner inp = null;

        public MyScanner() throws IOException
        {
            inp = new Scanner(System.in);
        }

        public MyScanner(String inputFile) throws IOException {
            inp = new Scanner(new FileInputStream(inputFile));
        }

        public int nextInt() throws IOException {
            return inp.nextInt();
        }

        public long nextLong() throws IOException {
            return inp.nextLong();
        }

        public double nextDouble() throws IOException {
            return inp.nextDouble();
        }

        public String nextString() throws IOException {
            return inp.next();
        }

    }

}

Codeforces Round #157 (Div. 2): B - Little Elephant and Magic Square

// Codeforces Round #157 (Div. 2):    B - Little Elephant and Magic Square

import java.io.*;
import java.math.*;
import java.util.*;

//codeforces
public class MainCodeforces1 {
 private static MyScanner in;
 private static PrintStream out;

 public static void main(String[] args) throws IOException {
  // helpers for input/output
  boolean LOCAL_TEST = false;
  // LOCAL_TEST = true;// comment it before submitting
  out = System.out;
  if (LOCAL_TEST) {
   in = new MyScanner("E:\\zin2.txt");
  }
  else {
   boolean usingFileForIO = false;
   if (usingFileForIO) {
    // using input.txt and output.txt as I/O
    in = new MyScanner("input.txt");
    out = new PrintStream("output.txt");
   }
   else {
    in = new MyScanner();
    out = System.out;
   }
  }

  solve();
 }

 private static void solve() throws IOException
 {
  Integer[] x = new Integer[9];
  for (int i = 0; i < 9; i++) {
   x[i] = in.nextInt();
  }
  int sum2 = x[2] + x[6];
  for (int x0 = 1; x0 <= 100000; x0++)
  {
   x[0] = x0;
   x[8] = sum2 - x[0];
   int sum3 = x[0] + x[3] + x[6];
   if (x[6] + x[7] + x[8] == sum3)
   {
    x[4] = sum3 - x[0] - x[8];
    if (x[8] > 0 && x[4] > 0)
     break;
   }
  }
  int k = 0;
  out.println(x[k++] + " " + x[k++] + " " + x[k++]);
  out.println(x[k++] + " " + x[k++] + " " + x[k++]);
  out.println(x[k++] + " " + x[k++] + " " + x[k++]);
 }

 static class MyScanner {
  StreamTokenizer in;

  public MyScanner() throws IOException
  {
   Reader r = new BufferedReader(new InputStreamReader(System.in));
   in = new StreamTokenizer(r);
  }

  public MyScanner(String inputFile) throws IOException {
   Reader r;
   r = new BufferedReader(new FileReader(inputFile));
   in = new StreamTokenizer(r);
  }

  public int nextInt() throws IOException {
   in.nextToken();
   return (int) in.nval;
  }

  public long nextLong() throws IOException {
   in.nextToken();
   return (long) in.nval;
  }

  public double nextDouble() throws IOException {
   in.nextToken();
   return in.nval;
  }

  public String nextString() throws IOException {
   in.nextToken();
   if (in.ttype == StreamTokenizer.TT_WORD)
    return in.sval;
   else if (in.ttype == StreamTokenizer.TT_NUMBER)
    return String.valueOf(in.nval);
   else
    return null;
  }
 }

}

Codeforces Round #157 (Div. 2): A - Little Elephant and Chess

// Codeforces Round #157 (Div. 2):    A - Little Elephant and Chess

import java.io.*;
import java.math.*;
import java.util.*;

//codeforces
public class MainCodeforces1 {
 private static MyScanner in;
 private static PrintStream out;

 public static void main(String[] args) throws IOException {
  // helpers for input/output
  boolean LOCAL_TEST = false;
  // LOCAL_TEST = true;// comment it before submitting
  out = System.out;
  if (LOCAL_TEST) {
   in = new MyScanner("E:\\zin2.txt");
  }
  else {
   boolean usingFileForIO = false;
   if (usingFileForIO) {
    // using input.txt and output.txt as I/O
    in = new MyScanner("input.txt");
    out = new PrintStream("output.txt");
   }
   else {
    in = new MyScanner();
    out = System.out;
   }
  }

  solve();
 }

 private static void solve() throws IOException
 {
  boolean possible = true;
  for (int i = 0; i < 8; i++) {
   String s = in.nextString();
   if (!(s.equals("WBWBWBWB") || s.equals("BWBWBWBW")))
    possible = false;
  }
  if (possible)
   out.println("YES");
  else
   out.println("NO");
 }

 static class MyScanner {
  StreamTokenizer in;

  public MyScanner() throws IOException
  {
   Reader r = new BufferedReader(new InputStreamReader(System.in));
   in = new StreamTokenizer(r);
  }

  public MyScanner(String inputFile) throws IOException {
   Reader r;
   r = new BufferedReader(new FileReader(inputFile));
   in = new StreamTokenizer(r);
  }

  public int nextInt() throws IOException {
   in.nextToken();
   return (int) in.nval;
  }

  public long nextLong() throws IOException {
   in.nextToken();
   return (long) in.nval;
  }

  public double nextDouble() throws IOException {
   in.nextToken();
   return in.nval;
  }

  public String nextString() throws IOException {
   in.nextToken();
   if (in.ttype == StreamTokenizer.TT_WORD)
    return in.sval;
   else if (in.ttype == StreamTokenizer.TT_NUMBER)
    return String.valueOf(in.nval);
   else
    return null;
  }
 }

}

Codeforces Round #156 (Div. 2): B - Code Parsing

// Codeforces Round #156 (Div. 2): B - Code Parsing

import java.io.*;
import java.math.*;
import java.util.*;

public class MainCodeforces1 {
    private static MyScanner in;
    private static PrintStream out;

    public static void main(String[] args) throws IOException {
        // helpers for input/output
        boolean LOCAL_TEST = false;
        // LOCAL_TEST = true;// comment it before submitting
        out = System.out;
        if (LOCAL_TEST) {
            in = new MyScanner("E:\\zin2.txt");
        }
        else {
            boolean usingFileForIO = false;
            if (usingFileForIO) {
                // using input.txt and output.txt as I/O
                in = new MyScanner("input.txt");
                out = new PrintStream("output.txt");
            }
            else {
                in = new MyScanner();
                out = System.out;
            }
        }

        solve();
    }

    private static void solve() throws IOException
    {
        // int k = in.nextInt();
        String s = in.nextString();
        LinkedList<Character> ss = new LinkedList<Character>();
        ListIterator<Character> it = ss.listIterator();
        for (int i = 0; i < s.length(); i++) {
            it.add(s.charAt(i));
        }

        while (it.hasPrevious())
            it.previous();

        while (true) {
            Character cur = it.next();
            if (!it.hasNext())
                break;
            Character next = it.next();
            if (cur != next) {
                it.previous();
                it.remove();
                it.previous();
                it.remove();
            }
            if (it.hasPrevious())
                it.previous();
        }

        while (it.hasPrevious())
            it.previous();
        StringBuffer sb = new StringBuffer("");
        while (it.hasNext())
        {
            Character c = it.next();
            sb.append(c);
        }
        out.println(sb);
    }

    static class MyScanner {
        StreamTokenizer in;

        public MyScanner() throws IOException
        {
            Reader r = new BufferedReader(new InputStreamReader(System.in));
            in = new StreamTokenizer(r);
        }

        public MyScanner(String inputFile) throws IOException {
            Reader r;
            r = new BufferedReader(new FileReader(inputFile));
            in = new StreamTokenizer(r);
        }

        public int nextInt() throws IOException {
            in.nextToken();
            return (int) in.nval;
        }

        public long nextLong() throws IOException {
            in.nextToken();
            return (long) in.nval;
        }

        public double nextDouble() throws IOException {
            in.nextToken();
            return in.nval;
        }

        public String nextString() throws IOException {
            in.nextToken();
            if (in.ttype == StreamTokenizer.TT_WORD)
                return in.sval;
            else if (in.ttype == StreamTokenizer.TT_NUMBER)
                return String.valueOf(in.nval);
            else
                return null;
        }
    }

}

Codeforces Round #156 (Div. 2): A - Greg's Workout

// Codeforces Round #156 (Div. 2): A - Greg's Workout

import java.io.*;
import java.math.*;
import java.util.*;

public class MainCodeforces1 {
    private static MyScanner in;
    private static PrintStream out;

    public static void main(String[] args) throws IOException {
        // helpers for input/output
        boolean LOCAL_TEST = false;
        // LOCAL_TEST = true;// comment it before submitting
        out = System.out;
        if (LOCAL_TEST) {
            in = new MyScanner("E:\\zin2.txt");
        }
        else {
            boolean usingFileForIO = false;
            if (usingFileForIO) {
                // using input.txt and output.txt as I/O
                in = new MyScanner("input.txt");
                out = new PrintStream("output.txt");
            }
            else {
                in = new MyScanner();
                out = System.out;
            }
        }

        solve();
    }

    private static void solve() throws IOException
    {
        int N = in.nextInt();
        int[] sum = new int[3];
        sum[0] = sum[1] = sum[2] = 0;

        for (int i = 0; i < N; i++) {
            int a = in.nextInt();
            sum[i % 3] += a;
        }
        int max = Math.max(sum[0], Math.max(sum[1], sum[2]));
        if (max == sum[0])
            out.println("chest");
        else if (max == sum[1])
            out.println("biceps");
        else
            out.println("back");
    }

    static class MyScanner {
        StreamTokenizer in;

        public MyScanner() throws IOException
        {
            Reader r = new BufferedReader(new InputStreamReader(System.in));
            in = new StreamTokenizer(r);
        }

        public MyScanner(String inputFile) throws IOException {
            Reader r;
            r = new BufferedReader(new FileReader(inputFile));
            in = new StreamTokenizer(r);
        }

        public int nextInt() throws IOException {
            in.nextToken();
            return (int) in.nval;
        }

        public long nextLong() throws IOException {
            in.nextToken();
            return (long) in.nval;
        }

        public double nextDouble() throws IOException {
            in.nextToken();
            return in.nval;
        }

        public String nextString() throws IOException {
            in.nextToken();
            return in.sval;
        }
    }

}