Largest product in a grid: Difference between revisions
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=={{header|Go}}==
{{trans|Wren}}
{{libheader|Go-rcu}}
<lang go>package main
import (
"fmt"
"rcu"
"strings"
)
var grid = [][]int {
{ 8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8},
{49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0},
{81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65},
{52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91},
{22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80},
{24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50},
{32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70},
{67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21},
{24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72},
{21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95},
{78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92},
{16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57},
{86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58},
{19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40},
{ 4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66},
{88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69},
{ 4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36},
{20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16},
{20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54},
{ 1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48},
}
func main() {
maxProd, maxR1, maxR2, maxC1, maxC2 := 0, 0, 0, 0, 0
var maxNums [4]int
h, w := len(grid), len(grid[0])
// right
for r := 0; r < h; r++ {
for c := 0; c < w-4; c++ {
prod := 1
for i := c; i < c+4; i++ {
prod *= grid[r][i]
}
if prod > maxProd {
maxProd = prod
for n := 0; n < 4; n++ {
maxNums[n] = grid[r][c+n]
}
maxR1, maxR2 = r, r
maxC1, maxC2 = c, c+3
}
}
}
// down
for c := 0; c < w; c++ {
for r := 0; r < h-4; r++ {
prod := 1
for i := r; i < r+4; i++ {
prod *= grid[i][c]
}
if prod > maxProd {
maxProd = prod
for n := 0; n < 4; n++ {
maxNums[n] = grid[r+n][c]
}
maxR1, maxR2 = r, r+3
maxC1, maxC2 = c, c
}
}
}
fmt.Println("The greatest product of four adjacent numbers in the same direction (down or right) in the grid is:")
var maxNumStrs [4]string
for i := 0; i < 4; i++ {
maxNumStrs[i] = fmt.Sprintf("%d", maxNums[i])
}
fmt.Printf(" %s = %s\n", strings.Join(maxNumStrs[:], " x "), rcu.Commatize(maxProd))
fmt.Print(" at indices (one based): ")
for r := maxR1; r <= maxR2; r++ {
for c := maxC1; c <= maxC2; c++ {
fmt.Printf("(%d, %d) ", r+1, c+1)
}
}
fmt.Println()
}</lang>
{{out}}
<pre>
The greatest product of four adjacent numbers in the same direction (down or right) in the grid is:
66 x 91 x 88 x 97 = 51,267,216
at indices (one based): (7, 16) (8, 16) (9, 16) (10, 16)
</pre>
=={{header|Julia}}==
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