`cout<<sum(y)-sum(x)<<endl;`
应为
`cout<<sum(y)-sum(x-1)<<endl;`
by bykem @ 2022-11-05 19:29:44
@[GODTREE](/user/776799)
by bykem @ 2022-11-05 19:29:50
@[wsfxk](/user/376161) 谢谢大佬
by GODTREE @ 2022-11-05 19:32:09