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Program that checks if a given string is whether a palindrome or not. To check this instead of check the hole string I do not have to loop over the hole ... The second one just use the reverse method ...

不然求一次palindrome, 就是n, 会变成O(n^3) #### Previous Notes - Double for loop 检查每种substring string (i~j). 若i,j相邻或者同点，那么肯定isPal；否则，i,j之间的（i+1, j-1）一定得isPal。 - 看上去，在检查i ...