Longest Common Substring
suggest changeGiven 2 string str1 and str2 we have to find the length of the longest common substring between them.
Examples
Input : X = “abcdxyz”, y = “xyzabcd” Output : 4
The longest common substring is “abcd” and is of length 4.
Input : X = “zxabcdezy”, y = “yzabcdezx” Output : 6
The longest common substring is “abcdez” and is of length 6.
Implementation in Java
public int getLongestCommonSubstring(String str1,String str2){ int arr[][] = new int[str2.length()+1][str1.length()+1]; int max = Integer.MIN_VALUE; for(int i=1;i<=str2.length();i++){ for(int j=1;j<=str1.length();j++){ if(str1.charAt(j-1) == str2.charAt(i-1)){ arr[i][j] = arr[i-1][j-1]+1; if(arr[i][j]>max) max = arr[i][j]; } else arr[i][j] = 0; } } return max; }
Time Complexity
O(m*n)
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