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-2 bytes thanks to Joseph Sible.
f i|e<-length i=last[(s,l)|l<-[0..length i]e],s<-[0..length ie-l],0==sum(take l$drop s i)]
Try it online!
Outputs first index and length as a tuple.Try it online!
f i=last[(s,l)|l<-[0..length i],s<-[0..length i-l],0==sum(take l$drop s i)]
Outputs first index and length as a tuple.
f i|e<-length i=last[(s,l)|l<-[0..e],s<-[0..e-l],0==sum(take l$drop s i)]
