CF1245F Daniel and Spring Cleaning

给定$l,r$，求 $$\sum_{a=l}^r\sum_{b=l}^r[a+b=a\oplus b]$$

无

无

$ a \oplus b $ denotes the bitwise XOR of $ a $ and $ b $ . For the first testcase, the pairs are: $ (1, 2) $ , $ (1, 4) $ , $ (2, 1) $ , $ (2, 4) $ , $ (3, 4) $ , $ (4, 1) $ , $ (4, 2) $ , and $ (4, 3) $ .