Create LongestCommonSubstring.txt

Author: mohitsingla123

Problem Statement/LongestCommonSubstring.txt

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+Longest Common Substring | DP-29
+
+Given two strings ‘X’ and ‘Y’, find the length of the longest common substring.
+
+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.