From 709dff930bbc9b3dc9628a2afc94b3619335e763 Mon Sep 17 00:00:00 2001
From: Pierre Jeanjean <rhiobet@gmail.com>
Date: Thu, 9 Dec 2021 13:26:52 +0100
Subject: [PATCH] Day 9

---
 09/01.sh | 41 +++++++++++++++++++++++++++++++++++
 09/02.sh | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100755 09/01.sh
 create mode 100755 09/02.sh

diff --git a/09/01.sh b/09/01.sh
new file mode 100755
index 0000000..135b76e
--- /dev/null
+++ b/09/01.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+i_max=-1
+j_max=0
+locations=()
+marked_locations=()
+while read line; do
+  if [ $i_max -lt 0 ]; then
+    i_max=${#line}
+  fi
+  locations+=( $(sed 's/\([0-9]\)/\1 /g' <<< $line) )
+  j_max=$((j_max+1))
+done
+for i in $(seq 0 $((i_max-1))); do
+  for j in $(seq 0 $((j_max-1))); do
+    marked_locations+=( 0 )
+  done
+done
+
+for i in $(seq 0 $((i_max-1))); do
+  for j in $(seq 0 $((j_max-1))); do
+    curr_location=${locations[$((i+j*i_max))]}
+    if { [ $i -gt 0 ] && [ $curr_location -ge ${locations[$((i-1+j*i_max))]} ] ;} \
+	    || { [ $i -lt $((i_max-1)) ] && [ $curr_location -ge ${locations[$((i+1+j*i_max))]} ] ;} \
+	    || { [ $j -gt 0 ] && [ $curr_location -ge ${locations[$((i+(j-1)*i_max))]} ] ;} \
+	    || { [ $j -lt $((j_max-1)) ] && [ $curr_location -ge ${locations[$((i+(j+1)*i_max))]} ] ;}; then
+      marked_locations[$((i+j*i_max))]=1
+    fi
+  done
+done
+
+sum=0
+for i in $(seq 0 $((i_max-1))); do
+  for j in $(seq 0 $((j_max-1))); do
+    curr_location=${marked_locations[$((i+j*i_max))]}
+    if [ $curr_location -eq 0 ]; then
+      sum=$((sum+1+locations[i+j*i_max]))
+    fi
+  done
+done
+echo $sum
diff --git a/09/02.sh b/09/02.sh
new file mode 100755
index 0000000..4e9979d
--- /dev/null
+++ b/09/02.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+
+i_max=-1
+j_max=0
+locations=()
+marked_locations=()
+while read line; do
+  if [ $i_max -lt 0 ]; then
+    i_max=${#line}
+  fi
+  locations+=( $(sed 's/\([0-9]\)/\1 /g' <<< $line) )
+  j_max=$((j_max+1))
+done
+for i in $(seq 0 $((i_max-1))); do
+  for j in $(seq 0 $((j_max-1))); do
+    marked_locations+=( 0 )
+  done
+done
+
+for i in $(seq 0 $((i_max-1))); do
+  for j in $(seq 0 $((j_max-1))); do
+    curr_location=${locations[$((i+j*i_max))]}
+    if [ $curr_location -ne 9 ]; then
+      marked_locations[$((i+j*i_max))]=$((marked_locations[i+j*i_max]+1))
+      curr_i=$i
+      curr_j=$j
+      curr_min=$curr_location
+      min_found=0
+      while [ $min_found -eq 0 ]; do
+        if [ $curr_i -gt 0 ] && [ ${locations[$((curr_i-1+curr_j*i_max))]} -lt $curr_min ]; then
+          marked_locations[$((curr_i-1+curr_j*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i-1+curr_j*i_max]))
+          marked_locations[$((curr_i+curr_j*i_max))]=0
+	  curr_min=${locations[$((curr_i-1+curr_j*i_max))]}
+	  curr_i=$((curr_i-1))
+        elif [ $curr_j -gt 0 ] && [ ${locations[$((curr_i+(curr_j-1)*i_max))]} -lt $curr_min ]; then
+	  marked_locations[$((curr_i+(curr_j-1)*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+(curr_j-1)*i_max]))
+          marked_locations[$((curr_i+curr_j*i_max))]=0
+	  curr_min=${locations[$((curr_i+(curr_j-1)*i_max))]}
+	  curr_j=$((curr_j-1))
+        elif [ $curr_i -lt $((i_max-1)) ] && [ ${locations[$((curr_i+1+curr_j*i_max))]} -lt $curr_min ]; then
+          marked_locations[$((curr_i+1+curr_j*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+1+curr_j*i_max]))
+          marked_locations[$((curr_i+curr_j*i_max))]=0
+	  curr_min=${locations[$((curr_i+1+curr_j*i_max))]}
+	  curr_i=$((curr_i+1))
+        elif [ $curr_j -lt $((j_max-1)) ] && [ ${locations[$((curr_i+(curr_j+1)*i_max))]} -lt $curr_min ]; then
+          marked_locations[$((curr_i+(curr_j+1)*i_max))]=$((marked_locations[curr_i+curr_j*i_max]+marked_locations[curr_i+(curr_j+1)*i_max]))
+          marked_locations[$((curr_i+curr_j*i_max))]=0
+	  curr_min=${locations[$((curr_i+(curr_j+1)*i_max))]}
+	  curr_j=$((curr_j+1))
+	else
+	  min_found=1
+        fi
+      done
+    fi
+  done
+done
+
+sizes=()
+for marked_location in ${marked_locations[@]}; do
+  if [ $marked_location -gt 0 ]; then
+    sizes+=( $marked_location )
+  fi
+done
+sizes=( $(printf '%s\n' "${sizes[@]}" | sort -nr) )
+echo $((sizes[0]*sizes[1]*sizes[2]))