Analysis_of_Algorithms/ModifiedRLE.java at master · TushaarGVS/Analysis_of_Algorithms · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
import java.util.*;
import java.lang.*;

public class ModifiedRLE {
    public static void main(String [] args) {
        String s1 = "" ;
        int i, j, k ;

        Scanner in = new Scanner(System.in) ;
        System.out.print("Enter the input bit sequence: ") ;
        s1 = in.next() ;

        int count = 1, index = 0 ;
        int freq[] = new int[s1.length()+1];

        for(i = 0; i < s1.length(); i++) {
            if(i < s1.length()-1 && s1.charAt(i) == s1.charAt(i+1))
                count++;
            else {
                freq[index++] = count ;
                count = 1 ;
            }
        }

        /*
        for(i = 0; i < freq.length; i++)
            System.out.print(freq[i]) ;
        */

        int max_val = 0, max_bits = 0 ;
        for(i = 0; i < freq.length; i++)
            if(max_val < freq[i])
                max_val = freq[i] ;

        // System.out.println(max_val + " " + max_ind) ;

        int stuffbit = 0, cutoff = 0, t = 0 ;
        stuffbit = (Integer.toBinaryString(max_val)).length() - 1;
        cutoff = (int)Math.pow(2, stuffbit) ;
        String s2 = "" ;

        for(i = 0; i < freq.length; i++) {
            int temp = 1 ;
            if(freq[i] >= cutoff) {
                int index_val = t ;
                int num = ((cutoff+1)*(freq[i]/cutoff)) + freq[i]%cutoff ;
                for(j = 0; j < num && t < s1.length(); j++) {
                    if(t == index_val + cutoff*temp - 1) {
                        if(s1.charAt(t) == '0')
                            s2 += '1' ;
                        else
                            s2 += '0' ;
                        temp++ ;
                    } else {
                        s2 += s1.charAt(t) ;
                        t++ ;
                    }
                }
            } else
                for(j = 0; j < freq[i] && t < s1.length(); j++) {
                    s2 += s1.charAt(t) ;
                    t++ ;
                }
        }
        System.out.println(s2) ;

        int new_freq[] = new int[s2.length()+1] ;
        index = 0 ;
        count = 1 ;
        for(i = 0; i < s2.length(); i++) {
            if(i < s2.length()-1 && s2.charAt(i) == s2.charAt(i+1))
                count++;
            else {
                new_freq[index++] = count ;
                count = 1 ;
            }
        }

        max_val = 0 ;
        max_bits = 0 ;
        for(i = 0; i < new_freq.length; i++)
            if(max_val < new_freq[i])
                max_val = new_freq[i] ;
        max_bits = (int) Math.ceil(Math.log(max_val)/Math.log(2)) ;

 /*int temp = 0;
        	for(i = 0; i<freq.length && temp<s1.length(); i++) {
        		//freq[i]-=1;
        		String intermediate = Integer.toBinaryString(freq[i]-1) ;
        		//System.out.println(intermediate.length());
        		if(max_bits - intermediate.length() > 0) {
        			int num_zeros = max_bits - intermediate.length() ;
        			//num_zeros++;
        			System.out.println("No. of 0s - "+num_zeros);
        			String zeros = "0" ;
        			while(num_zeros > 1){
        				zeros += "0" ;
        				num_zeros--;
        			}
        			//if(intermediate.length() + 1 == max_bits)
        			//	zeros += "0";
        			intermediate = zeros + intermediate ;
        		}
        		System.out.println(intermediate);
                	s2 += (s1.substring(temp, temp + 1) + intermediate + " ") ;
            		temp += freq[i] ;
        	}
        	System.out.println(s2) ;
   */
        String s3 = "" ;
        int temp = 0 ;
        for(i = 0; i < new_freq.length; i++) {
            if(new_freq[i] > 2) {
            	String intermediate = Integer.toBinaryString(new_freq[i]) ;
        	if(max_bits - intermediate.length() > 0) {
        		int num_zeros = max_bits - intermediate.length() ;
        		//num_zeros++;
        		System.out.println("No. of 0s - "+num_zeros);
        		String zeros = "0" ;
        		while(num_zeros > 1){
        			zeros += "0" ;
        			num_zeros--;
        		}
        		//if(intermediate.length() + 1 == max_bits)
        		//	zeros += "0";
        		intermediate = zeros + intermediate ;
        	}
               s3 += ("[" + s2.substring(temp, temp+3) + " " + intermediate + "]") ;
            } else
                s3 += (s2.substring(temp, temp+new_freq[i]) + " ") ;
            temp += new_freq[i] ;
        }
        System.out.println(s3) ;
    }
}