open System
open System.Collections.Generic

let ri () = stdin.ReadLine() |> int
let ria () = stdin.ReadLine().Split() |> Array.map int
let swap a b (xs:'t []) = 
    let tmp = xs.[a]
    xs.[a] <- xs.[b]
    xs.[b] <- tmp

type Sol() =
    member this.Solve() = 
        let N = ri ()
        let A = ria ()
        
        let L = new List<int*int> ()
        for i in 0..(N-2) do
            let m = A |> Array.skip i |> Array.min
            let trgt = A |> Array.skip i |> Array.findIndex ( (=) m ) |> (+) i
            
            // printfn "%s" (String.Join(" ",A))
            // printfn "min: %d" m
            // printfn "midx:%d" trgt
            
            
            if trgt <> i then (
                swap m trgt A ;
                L.Add(i,trgt)
            )
        
        L.Count |> printfn "%d"
        L |> Seq.iter (fun (a,b) -> printfn "%d %d" a b)
        
        let dummy = ri()
        ()
        
let mySol = new Sol()
mySol.Solve()