import java.util.*; 

import java.io.IOException; 
import org.apache.hadoop.fs.Path; 
import org.apache.hadoop.io.*; 
import org.apache.hadoop.mapred.*; 

public class WordCount 
{ 
   //Mapper class 
   public static class E_EMapper extends MapReduceBase implements 
   Mapper<LongWritable ,/*Input key Type */ 
   Text,                /*Input value Type*/ 
   Text,                /*Output key Type*/ 
   IntWritable>        /*Output value Type*/ 
   { 
      
      //Map function 
      public void map(LongWritable key, Text value, 
      OutputCollector<Text, IntWritable> output,   
      Reporter reporter) throws IOException 
      { 
         String line = value.toString();
         StringTokenizer s = new StringTokenizer(line," ");
         while(s.hasMoreTokens())
         {
            String lasttoken = s.nextToken();
            output.collect(new Text(lasttoken), new IntWritable(1));
         }          
      } 
   } 
   
   
   //Reducer class 
   public static class E_EReduce extends MapReduceBase implements 
   Reducer< Text, IntWritable, Text, IntWritable > 
   {  
   
      //Reduce function 
      public void reduce( Text key, Iterator <IntWritable> values, 
         OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException 
         { 
            int sum=0;             
            
            while (values.hasNext()) 
            { 
            	int val = values.next().get();     
            	sum += val;
            } 
            
            output.collect(key, new IntWritable(sum));
             
 
         } 
   }  
   
   
   //Main function 
   public static void main(String args[])throws Exception 
   { 
      JobConf conf = new JobConf(WordCount.class); 
      
      conf.setJobName("max_eletricityunits"); 
      conf.setOutputKeyClass(Text.class);
      conf.setOutputValueClass(IntWritable.class); 
      conf.setMapperClass(E_EMapper.class); 
      conf.setCombinerClass(E_EReduce.class); 
      conf.setReducerClass(E_EReduce.class); 
      conf.setInputFormat(TextInputFormat.class); 
      conf.setOutputFormat(TextOutputFormat.class); 
      
      FileInputFormat.setInputPaths(conf, new Path(args[0])); 
      FileOutputFormat.setOutputPath(conf, new Path(args[1])); 
      
      JobClient.runJob(conf); 
   } 
}