open Graph

val paiement: float graph -> string -> string list -> float -> (string * id * float) list -> (float graph * (string * id * float) list)

val init_node: float graph -> string -> id -> (string * id * float) list-> (float graph * (string * id * float) list)

val get_id: string -> (string * id * float) list -> id

val get_user: id -> (string * id * float) list -> string

val set_val_du: string -> (string * id * float) list -> float -> string list -> (string * id * float) list

val set_val_pret: string -> float -> (string * id * float) list -> (string * id * float) list