InterviewBit-Solutions/Programming/Hashing/ValidSudoku.java at master · garv-cmd/InterviewBit-Solutions · 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
package Hashing;

import java.util.*;

/**
 * Author - archit.s
 * Date - 28/10/18
 * Time - 7:03 PM
 */
public class ValidSudoku {

    public boolean checkRowWise(List<String> A){

        for(int i=0;i<A.size();i++){
            String row = A.get(i);
            Set<Character> s = new HashSet<>();
            for(int j=0;j<row.length();j++){
                Character temp = row.charAt(j);
                if(temp == '.'){
                    continue;
                }
                else if(s.contains(temp)){
                    return true;
                }
                else{
                    s.add(temp);
                }
            }
        }

        return false;
    }


    public boolean checkColWise(List<String> A){

        int colL = A.get(0).length();
        int rowL = A.size();

        for(int i=0;i<colL;i++){
            Set<Character> s = new HashSet<>();
            for(int j=0;j<rowL;j++){
                Character c = A.get(j).charAt(i);
                if(c == '.'){
                    continue;
                }
                if(s.contains(c)){
                    return true;
                }
                else{
                    s.add(c);
                }
            }
        }

        return false;
    }

    public boolean checkBoxWise(List<String> A){

        int colL = A.get(0).length();
        int rowL = A.size();

        int boxCount = (colL/3)*(rowL/3);

        Map<Integer,Set<Character>> map = new HashMap<>();

        for(int i=0;i<boxCount;i++){
            map.put(i,new HashSet<>());
        }

        for(int i=0;i<A.size();i++){
            String row = A.get(i);
            for(int j=0;j<row.length();j++){

                int boxNumber = (j/3)*(colL/3) + (i/3);
                Set<Character> s = map.get(boxNumber);
                Character temp = row.charAt(j);
                if(temp == '.'){
                    continue;
                }
                else if(s.contains(temp)){
                    return true;
                }
                else{
                    s.add(temp);
                    map.put(boxNumber,s);
                }
            }
        }

        return false;
    }

    public int isValidSudoku(final List<String> A) {

        if(checkRowWise(A) || checkColWise(A) || checkBoxWise(A) ){
            return 0;
        }

        return 1;
    }
}