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min_distance.go
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/
min_distance.go
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package main
import (
"bufio"
"fmt"
"os"
)
func minDistance(word1 string, word2 string) int {
m, n := len(word1), len(word2)
dp := make([][]int, m+1)
for i := 0; i <= m; i++ {
dp[i] = make([]int, n+1)
dp[i][0] = i
}
for j := 0; j <= n; j++ {
dp[0][j] = j
}
for i := 1; i <= m; i++ {
for j := 1; j <= n; j++ {
if word1[i-1] == word2[j-1] {
dp[i][j] = dp[i-1][j-1]
} else {
dp[i][j] = min(min(dp[i-1][j-1]+1, dp[i-1][j]+1), dp[i][j-1]+1)
}
}
}
return dp[m][n]
}
func min(lhs, rhs int) int {
if lhs < rhs {
return lhs
}
return rhs
}
func main() {
stdin, err := os.Open(os.Getenv("INPUT_PATH"))
if err != nil {
stdin = os.Stdin
}
defer stdin.Close()
stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
if err != nil {
stdout = os.Stdout
}
defer stdout.Close()
reader := bufio.NewReaderSize(stdin, 1024*1024)
writer := bufio.NewWriterSize(stdout, 1024*1024)
var word1, word2 string
_, err = fmt.Fscanln(reader, &word1)
checkError(err)
_, err = fmt.Fscanln(reader, &word2)
checkError(err)
result := minDistance(word1, word2)
fmt.Fprintln(writer, result)
writer.Flush()
}
func checkError(err error) {
if err != nil {
panic(err)
}
}