You Do Need power plug adapter while traveling from Madagascar to Laos.

Here is Why You Need An Adapter

The outlet and plug type used in Laos are A, B, C, E and F and in Madagascar are C and E. This is how they look like.

Madagascar

In Madagascar, outlets of type C and E are in use.

Type C

Type E

Laos

In Laos, outlets of type A, B, C, E and F are in use.

Type A

Type B

Type C

Type E

Type F