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levenshtein.sh
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#!/bin/bash | |
function levenshtein() { a="$1"; b="$2"; | |
if [ "$a" == "$b" ]; then echo 0; return 0; fi | |
if [ 0 -eq ${#a} ]; then echo ${#b}; return 0; fi | |
if [ 0 -eq ${#b} ]; then echo ${#a}; return 0; fi | |
d0=(0) | |
d1=() | |
for i in $(seq 1 ${#b}); do d0[$i]=$i; done | |
aii=0; ai=1; | |
while [ $ai -le ${#a} ]; do | |
d1[0]=$ai; | |
ae="${a:$ai-1:1}"; | |
bii=0; bi=1; | |
while [ $bi -le ${#b} ]; do | |
if [ "$ae" == "${b:$bii:1}" ]; then | |
d1[$bi]=${d0[$bii]}; | |
else | |
x=${d0[$bii]}; y=${d0[$bi]}; z=${d1[$bii]}; | |
if [ $x -lt $y ]; then | |
if [ $x -lt $z ]; then | |
d1[$bi]=$x; | |
else | |
d1[$bi]=$z; | |
fi | |
else | |
if [ $y -lt $z ]; then | |
d1[$bi]=$y; | |
else | |
d1[$bi]=$z; | |
fi | |
fi | |
d1[$bi]=$((${d1[$bi]} + 1)); | |
fi | |
bii=$bi; bi=$(($bi+1)); | |
done | |
dd=(${d0[@]}); d0=(${d1[@]}); d1=(${dd[@]}); | |
aii=$ai; ai=$(($ai+1)); | |
done | |
echo ${d0[${#b}]}; | |
return 0; | |
} |
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