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  1. import java.io.*;
  2. import java.util.*;
  3.  
  4. public class Main {
  5.   public static void main(String[] args)throws IOException{
  6.      int Y=0;
  7.      Reader.init( System.in ); // connect Reader to an input stream
  8.      int S=Reader.nextInt();
  9.      int N = Reader.nextInt();
  10.      BufferedReader br = new BufferedReader( new InputStreamReader( System.in ) );
  11.      String H= br.readLine();
  12.  
  13.  
  14.     int[] num = new int[H.length()];
  15.     for (int i = 0; i < H.length(); i++){
  16.         num[i] = H.charAt(i) - '0';
  17.     }
  18.     if (num[0]==1 && num[(H.length())-1]==1){
  19.      for (int i = 1; i <(((N+1)/2);){
  20.        if ((num[((N+1)/2)-1]-num[((N+1)/2)-(1+i)]==i) &&(num[((N+1)/2)-1]-num[((N+1)/2)-(1-i)]==i) ){
  21.           i++;
  22.        else{
  23.         System.out.print("no");
  24.         break;
  25.            } 
  26.      }   
  27.      }}
  28.     else{
  29.       System.out.print("no");
  30.     }
  31.  
  32.   }}
  33. /** Class for buffered reading int value */
  34. class Reader {
  35.     static BufferedReader reader;
  36.     static StringTokenizer tokenizer;
  37.  
  38.     /** call this method to initialize reader for InputStream */
  39.     static void init(InputStream input) {
  40.         reader = new BufferedReader(new InputStreamReader(input) );
  41.         tokenizer = new StringTokenizer("");
  42.     }
  43.  
  44.     /** get next word */
  45.     static String next() throws IOException {
  46.         while ( ! tokenizer.hasMoreTokens() ) {
  47.             //TODO add check for eof if necessary
  48.             tokenizer = new StringTokenizer( reader.readLine() );
  49.         }
  50.         return tokenizer.nextToken();
  51.     }
  52.  
  53.     static int nextInt() throws IOException {
  54.         return Integer.parseInt( next() );
  55.     }}
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https://ideone.com/yLbtOE
language:
Text (text 6.10)
created:
6 years ago
visibility:
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