114 lines
2.7 KiB
Bash
114 lines
2.7 KiB
Bash
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#!/usr/bin/env/bash
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FILE=input
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MAP_WIDTH=101
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MAP_HEIGHT=103
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MEDIAN_WIDTH=$(( MAP_WIDTH / 2 - 1 ))
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if [[ $(( MAP_WIDTH % 2 )) -eq 1 ]]
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then
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(( MEDIAN_WIDTH++ ))
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fi
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MEDIAN_HEIGHT=$(( MAP_HEIGHT / 2 - 1 ))
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if [[ $(( MAP_HEIGHT % 2 )) -eq 1 ]]
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then
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(( MEDIAN_HEIGHT++ ))
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fi
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printf "Median width: %s, median height: %s\n" "$MEDIAN_WIDTH" "$MEDIAN_HEIGHT"
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# Load bot positions and velocities
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read -r -a BOT_ARRAY <<< "$( grep -Eo '[-0-9]*' "$FILE" | paste -s -d " " )"
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#printf "%s " "${BOT_ARRAY[@]}"
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#printf "\n"
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printf "Bot array size: %s\n" "${#BOT_ARRAY[@]}"
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# Just move forward n seconds for every bot and save
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# final positions
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IFS=';'; read -r -a FINAL_ARRAY <<< "$(
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SECONDS=100
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for (( i=0; i<${#BOT_ARRAY[@]}; i+=4 ))
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do
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PX=${BOT_ARRAY[i]}
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PY=${BOT_ARRAY[i+1]}
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VX=${BOT_ARRAY[i+2]}
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VY=${BOT_ARRAY[i+3]}
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FINAL_X=$(( PX + ( VX * SECONDS ) ))
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FINAL_Y=$(( PY + ( VY * SECONDS ) ))
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printf "%s %s;" "$FINAL_X" "$FINAL_Y"
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done <<< "${BOT_ARRAY[@]}"
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)"
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unset IFS
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#printf "%s\n" "${FINAL_ARRAY[@]}" | head
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printf "Final array size: %s\n" "${#FINAL_ARRAY[@]}"
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# Get number of robots in each quadrant
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Q1=0
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Q2=0
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Q3=0
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Q4=0
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ITER=9999
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while read -r RAW_X RAW_Y
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do
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# Adjust positions to be on map
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PX=$(( RAW_X % MAP_WIDTH ))
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if [[ $PX -lt 0 ]]
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then
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PX=$(( MAP_WIDTH + PX ))
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fi
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PY=$(( RAW_Y % MAP_HEIGHT ))
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if [[ $PY -lt 0 ]]
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then
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PY=$(( MAP_HEIGHT + PY ))
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fi
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# Check if negative positions, should not happen
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if [[ $PX -lt 0 ]] || [[ $PY -lt 0 ]]
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then
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printf "Negative final position. PX: %s PY: %s\n" "$PX" "$PY"
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fi
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if [[ $PX -ge $MAP_WIDTH ]] || [[ $PY -ge $MAP_HEIGHT ]]
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then
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printf "Out of bounds. PX: %s PY: %s\n" "$PX" "$PY"
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fi
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printf "PX: %s PY: %s\n" "$PX" "$PY"
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# Allocate robot to quadrant
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if \
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[[ $PX -ge 0 ]] && \
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[[ $PX -lt $MEDIAN_WIDTH ]] && \
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[[ $PY -ge 0 ]] && \
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[[ $PY -lt $MEDIAN_HEIGHT ]] # Q1
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then
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(( Q1++ ))
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elif \
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[[ $PX -gt $MEDIAN_WIDTH ]] && \
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[[ $PX -lt $MAP_WIDTH ]] && \
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[[ $PY -ge 0 ]] && \
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[[ $PY -lt $MEDIAN_HEIGHT ]] # Q2
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then
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(( Q2++ ))
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elif \
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[[ $PX -ge 0 ]] && \
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[[ $PX -lt $MEDIAN_WIDTH ]] && \
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[[ $PY -gt $MEDIAN_HEIGHT ]] && \
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[[ $PY -lt $MAP_HEIGHT ]] # Q3
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then
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(( Q3++ ))
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elif \
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[[ $PX -gt $MEDIAN_WIDTH ]] && \
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[[ $PX -lt $MAP_WIDTH ]] && \
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[[ $PY -gt $MEDIAN_HEIGHT ]] && \
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[[ $PY -lt $MAP_HEIGHT ]] # Q4
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then
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(( Q4++ ))
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else
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printf "Skipped in the median. PX: %s PY: %s\n" "$PX" "$PY"
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fi
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(( ITER-- ))
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if [[ $ITER -eq 0 ]] ; then break ; fi
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done <<< "$( printf "%s\n" "${FINAL_ARRAY[@]}" )"
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# Calculate safety factor
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SAFETY_FACTOR=$(( Q1 * Q2 * Q3 * Q4 ))
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printf "Safety factor: %s\n" "$SAFETY_FACTOR"
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