题解 | #编辑距离(一)#

package main

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 *
 * @param str1 string字符串
 * @param str2 string字符串
 * @return int整型
 */
func editDistance(str1 string, str2 string) int {
	m, n := len(str1), len(str2)
	dp := make([][]int, m+1)
	for i := 0; i <= m; i++ {
		dp[i] = make([]int, n+1)
	}

	for i := 0; i <= m; i++ {
		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 str1[i-1] == str2[j-1] {
				dp[i][j] = dp[i-1][j-1]
			} else {
				dp[i][j] = 1 + min(dp[i-1][j], dp[i][j-1], dp[i-1][j-1])
			}
		}
	}

	return dp[m][n]
}

func min(a, b, c int) int {
	if a < b {
		if a < c {
			return a
		}
		return c
	}
	if b < c {
		return b
	}
	return c
}