This problem is in Contest(s) below:
Contest 1505:test-test-2018acm
Contest 1506:二进制练习
Contest 1703:二进制枚举练习
Contest 1946:二进制枚举练习
Contest 2218:二进制枚举练习赛2022
Contest 2460:二进制枚举练习赛2022