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March 21, 2017 01:19
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Print 2-D array in spiral order in Golang
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package main | |
import "fmt" | |
/* | |
Print 2-D array in spiral order | |
numbers := [ | |
[2, 4, 6, 8], | |
[5, 9, 12, 16], | |
[1, 11, 5, 9], | |
[3, 2, 1, 8], | |
] | |
=> 2, 4, 6, 8, 5, 9, 12, 16, 1, 11, 5, 9, 3, 2, 1, 8 | |
*/ | |
func PrintSpiral(list [][]int, rows, cols int) { | |
// initialize variables | |
var T, B, L, R, dir int = 0, rows - 1, 0, cols - 1, 0 | |
// the top-most must be less than or equal to bottom-most AND the left-most must be less than or equal to right-most | |
for { | |
if T >= B || L >= R { | |
break | |
} | |
// 0 - traverse right (going Left to Right) | |
if dir == 0 { | |
fmt.Println("going right") | |
for i := 0; i <= R; i++ { | |
fmt.Println(list[T][i]) | |
} | |
T++ | |
dir = 1 | |
} | |
// 1 - traverse down (going Top to Bottom) | |
if dir == 1 { | |
fmt.Println("going down") | |
for i := T; i <= B; i++ { | |
fmt.Println(list[i][R]) | |
} | |
R-- | |
dir = 2 | |
} | |
// 2 - traverse left | |
if dir == 2 { | |
fmt.Println("going left") | |
for i := R; i >= L; i-- { | |
//fmt.Println("---> ", R, i) | |
fmt.Println(list[B][i]) | |
} | |
B-- | |
dir = 3 | |
} | |
// 3 - traverse up | |
if dir == 3 { | |
for i := B; i >= T; i-- { | |
fmt.Println("going up") | |
fmt.Println(list[i][L]) | |
} | |
L++ | |
dir = 0 | |
} | |
} | |
fmt.Printf("wooo") | |
} | |
func main() { | |
l := [][]int{ | |
{2, 4, 6, 8}, | |
{5, 9, 12, 16}, | |
{1, 11, 5, 9}, | |
{3, 2, 1, 8}, | |
} | |
m := 4 // number of rows | |
n := 4 // number of columns | |
PrintSpiral(l, m, n) | |
} |
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