Source

euler / go / src / euler / 18.go

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package main

import "fmt"

var triangle = [][]int{
	{75},
	{95, 64},
	{17, 47, 82},
	{18, 35, 87, 10},
	{20, 4, 82, 47, 65},
	{19, 1, 23, 75, 3, 34},
	{88, 2, 77, 73, 7, 63, 67},
	{99, 65, 4, 28, 6, 16, 70, 92},
	{41, 41, 26, 56, 83, 40, 80, 70, 33},
	{41, 48, 72, 33, 47, 32, 37, 16, 94, 29},
	{53, 71, 44, 65, 25, 43, 91, 52, 97, 51, 14},
	{70, 11, 33, 28, 77, 73, 17, 78, 39, 68, 17, 57},
	{91, 71, 52, 38, 17, 14, 91, 43, 58, 50, 27, 29, 48},
	{63, 66, 4, 68, 89, 53, 67, 30, 73, 16, 69, 87, 40, 31},
	{4, 62, 98, 27, 23, 9, 70, 98, 73, 93, 38, 53, 60, 4, 23},
}

func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func maxPath(row, col int) int {
	value := triangle[row][col]
	if row == len(triangle)-1 {
		return value
	}
	return value + max(maxPath(row+1, col), maxPath(row+1, col+1))
}

func e18() {
	fmt.Println(maxPath(0, 0))
}

func init() {
    register("18", e18)
}