Minimum deletion to make a string palindrome.

Data Structure & Algorithm/minimumDeletion.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Function to calculate minimum
+// of two numbers
+int min(int a, int b) {
+    if (a < b) return a;
+    return b;
+}
+
+// This function will count the minimum deletions that need
+// to make a string palindrome
+int minimumDeletiontoMakePalindrome(char* str, int first, int last) {
+    if (first >= last) return 0;
+
+    // first and last character are same just
+    // increase first pointer and decrease
+    // last pointer and check again
+    if (str[first] == str[last])
+        return minimumDeletiontoMakePalindrome(str, first + 1, last - 1);
+
+    // if first and last character are not same
+
+    // str[first] != str[last] = 1 + min(str[first+1], str[last-1])
+
+    // above recurrence relation is used for the recursion call
+    else if (str[first] != str[last])
+        return 1 + min(minimumDeletiontoMakePalindrome(str, first + 1, last),
+                       minimumDeletiontoMakePalindrome(str, first, last - 1));
+}
+
+int main() {
+    char* str = "abcdfgckba";
+    int changes = minimumDeletiontoMakePalindrome(str, 0, strlen(str) - 1);
+
+    printf("%d\n", changes);
+
+    return 0;
+}