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Computer Sorting Algorithms Difficulty: Medium

What is the primary goal of "detrending" in time series analysis? How can you set a Cookie visibility scope to localStorage? What is the value stored in arr[2][4] when the following code is executed? #include<stdio.h> #include<string.h> int max(int a, int b) { if(a > b) return a; return b; } int min_ins(char *s) { int len = strlen(s), i, j; int arr[len + 1][len + 1]; char rev[len + 1]; strcpy(rev, s); strrev(rev); for(i = 0;i <= len; i++) arr[i][0] = 0; for(i = 0; i <= len; i++) arr[0][i] = 0; for(i = 1; i <= len; i++) { for(j = 1; j <= len; j++) { if(s[i - 1] == rev[j - 1]) arr[i][j] = arr[i - 1][j - 1] + 1; else arr[i][j] = max(arr[i - 1][j], arr[i][j - 1]); } } return len - arr[len][len]; } int main() { char s[] = "abcda"; int ans = min_ins(s); printf("%d",ans); return 0; } The preprocessor directive which is used to remove the definition of an identifier which was previously defined with #define? Which concept in OOP promotes reusability and reduces redundancy in code?