// Given two words word1 and word2,
// find the minimum number of steps required to convert word1 to word2.
// (each operation is counted as 1 step.)
// You have the following 3 operations permitted on a word:
// a) Insert a character
// b) Delete a character
// c) Replace a character
public int minDistance(String word1, String word2) {
int[][] dp = new int[word1.length() + 1][word2.length() + 1];
for (int i = 0; i <= word1.length(); i++) {
dp[i][0] = i;
}
for (int j = 0; j <= word2.length(); j++) {
dp[0][j] = j;
}
for (int i = 1; i < dp.length; i++) {
for (int j = 1; j < dp[0].length; j++) {
if (word1.charAt(i - 1) == word2.charAt(j - 1)) {
dp[i][j] = dp[i - 1][j - 1];
} else { //删 //增 //改
dp[i][j] = 1 + Math.min(Math.min(dp[i - 1][j], dp[i][j - 1]), dp[i - 1][j - 1]);
}
}
}
return dp[word1.length()][word2.length()];
}
给定2个字符串，求最少经过多少步变成第二个字符串
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