ianadiwibowo/central-park

package main

import (
    "fmt"

    "github.com/google/go-cmp/cmp"
)

// https://www.hackerrank.com/challenges/ctci-array-left-rotation/problem
// Complete the rotLeft function below.
func rotLeft(a []int32, d int32) []int32 {
    remainder := d % int32(len(a))
    if remainder == 0 {
        return a
    }

    return append(a[remainder:], a[:remainder]...)
}

func main() {
    a_cases := [][]int32{
        {1, 2, 3, 4, 5},
        {1, 2, 3, 4, 5},
        {1, 2, 3, 4, 5},
        {41, 73, 89, 7, 10, 1, 59, 58, 84, 77, 77, 97, 58, 1, 86, 58, 26, 10, 86, 51},
        {33, 47, 70, 37, 8, 53, 13, 93, 71, 72, 51, 100, 60, 87, 97},
    }
    d_cases := []int32{
        4,
        5,
        6,
        10,
        13,
    }
    expectations := [][]int32{
        {5, 1, 2, 3, 4},
        {1, 2, 3, 4, 5},
        {2, 3, 4, 5, 1},
        {77, 97, 58, 1, 86, 58, 26, 10, 86, 51, 41, 73, 89, 7, 10, 1, 59, 58, 84, 77},
        {87, 97, 33, 47, 70, 37, 8, 53, 13, 93, 71, 72, 51, 100, 60},
    }

    for i, v := range a_cases {
        result := rotLeft(v, d_cases[i])
        fmt.Printf("Passed: %v. Test: %v, %v. Expected: %v. Got: %v.\n",
            cmp.Equal(result, expectations[i]),
            v,
            d_cases[i],
            expectations[i],
            result,
        )
    }
}