Day 3

03/01.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+length=0
+n_array=()
+lines_number=0
+while read line; do
+  if [ $length -eq 0 ]; then
+    length=${#line}
+    n_array=($(for j in $(seq $length); do echo 0; done))
+  fi
+  for i in $(seq $length); do
+    curr_bit=${line:$((i-1)):1}
+    n_array[$((i-1))]=$((n_array[i-1]+curr_bit))
+  done
+  lines_number=$((lines_number+1))
+done
+
+gamma_rate=''
+epsilon_rate=''
+for i in $(seq $length); do
+  if [ ${n_array[$((i-1))]} -ge $((lines_number/2)) ]; then
+    gamma_rate=${gamma_rate}1
+    epsilon_rate=${epsilon_rate}0
+  else
+    gamma_rate=${gamma_rate}0
+    epsilon_rate=${epsilon_rate}1
+  fi
+done
+echo "ibase=2;obase=A;$gamma_rate*$epsilon_rate"|bc