GFG and it's efficient codes :)

#	User	Rating
1	ecnerwala	3648
2	Benq	3580
3	orzdevinwang	3570
4	cnnfls_csy	3569
5	Geothermal	3568
6	tourist	3565
7	maroonrk	3530
8	Radewoosh	3520
9	Um_nik	3481
10	jiangly	3467

#	User	Contrib.
1	maomao90	174
2	adamant	164
2	awoo	164
4	TheScrasse	160
5	nor	159
6	maroonrk	156
7	-is-this-fft-	150
7	SecondThread	150
9	orz	146
10	pajenegod	145

I was saw this problem and it's efficient approach. Turns out that this is only efficient and not accurate. I was wondering if this can be solved in less than O(n^2) ?

Loll's blog