From 6a3906b838e05243f970f33332b1b02fa11cd4df Mon Sep 17 00:00:00 2001
From: FuryFire <furyfire@users.noreply.github.com>
Date: Fri, 9 Mar 2012 12:48:16 +0100
Subject: [PATCH] Solved ProjectEuler/018: php, ruby

---
 ProjectEuler/018/desc.yml  | 23 +++++++++++++++++++++++
 ProjectEuler/018/input     | 15 +++++++++++++++
 ProjectEuler/018/solve.php | 16 ++++++++++++++++
 ProjectEuler/018/solve.rb  | 20 ++++++++++++++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 ProjectEuler/018/desc.yml
 create mode 100644 ProjectEuler/018/input
 create mode 100644 ProjectEuler/018/solve.php
 create mode 100644 ProjectEuler/018/solve.rb

diff --git a/ProjectEuler/018/desc.yml b/ProjectEuler/018/desc.yml
new file mode 100644
index 0000000..4ac3582
--- /dev/null
+++ b/ProjectEuler/018/desc.yml
@@ -0,0 +1,23 @@
+title: Find the maximum sum travelling from the top of the triangle to the base.
+url: http://projecteuler.net/problem=18
+
+desc: |
+  By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23.
+  3
+  7 4
+  2 4 6
+  8 5 9 3
+  That is, 3 + 7 + 4 + 9 = 23.
+  Find the maximum total from top to bottom of the triangle below
+  (See file input)
+
+  
+solution: Instead of bruteforcing from top to bottom simply add the numbers from the bottom up and let the "highest" number win in a shootout
+
+solutions:
+  solve.php:
+    desc: Basic solution
+    language: php
+  solve.rb:
+    desc: Basic solution
+    language: ruby
diff --git a/ProjectEuler/018/input b/ProjectEuler/018/input
new file mode 100644
index 0000000..c8f3e0f
--- /dev/null
+++ b/ProjectEuler/018/input
@@ -0,0 +1,15 @@
+75
+95 64
+17 47 82
+18 35 87 10
+20 04 82 47 65
+19 01 23 75 03 34
+88 02 77 73 07 63 67
+99 65 04 28 06 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 04 68 89 53 67 30 73 16 69 87 40 31
+04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
\ No newline at end of file
diff --git a/ProjectEuler/018/solve.php b/ProjectEuler/018/solve.php
new file mode 100644
index 0000000..be2a522
--- /dev/null
+++ b/ProjectEuler/018/solve.php
@@ -0,0 +1,16 @@
+<?php
+foreach(file('php://stdin') as $line) {
+$tri[] = explode(' ',trim($line));
+}
+for($y=count($tri);$y>=0;$y--) {
+
+	for($x=0;$x<count($tri[$y]);$x++) {
+	$cur = $tri[$y][$x];
+		if($cur + $tri[$y+1][$x] > $cur + $tri[$y+1][$x+1]) {
+			$tri[$y][$x] =  $cur + $tri[$y+1][$x];
+		} else {
+			$tri[$y][$x] = $cur + $tri[$y+1][$x+1];
+		}
+	}
+}
+echo $tri[0][0];
\ No newline at end of file
diff --git a/ProjectEuler/018/solve.rb b/ProjectEuler/018/solve.rb
new file mode 100644
index 0000000..bcba678
--- /dev/null
+++ b/ProjectEuler/018/solve.rb
@@ -0,0 +1,20 @@
+tri = []
+linenum = 0
+ARGF.lines("\n") do |line|
+	tri[linenum] = Array.new
+	line.split.each do |str|
+		tri[linenum] << str.to_i
+	end
+	linenum += 1
+end
+
+(0..13).reverse_each do |y|
+	0.upto(tri[y].size()-1) do |x|
+		if( tri[y+1][x] > tri[y+1][x+1]) 
+			tri[y][x] =  tri[y][x] + tri[y+1][x]
+		else
+			tri[y][x] = tri[y][x] + tri[y+1][x+1]
+		end
+	end
+end
+puts tri[0][0]
\ No newline at end of file