Description
Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.
Example
Example 1:
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| Input: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac"
Output: true
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Example 2:
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| Input: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc"
Output: false
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Solution
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| class Solution {
public boolean isInterleave(String s1, String s2, String s3) {
if (s1.length() + s2.length() != s3.length()) return false;
boolean[][] dp = new boolean[s1.length() + 1][s2.length() + 1];
dp[0][0] = true;
for (int i = 1; i <= s2.length(); i++){
dp[0][i] = dp[0][i-1] && (s2.charAt(i-1) == s3.charAt(i-1));
}
for (int i = 1; i <= s1.length(); i++){
dp[i][0] = dp[i-1][0] && (s1.charAt(i-1) == s3.charAt(i-1));
}
for (int i = 1; i <= s1.length(); i++){
for (int j = 1; j <= s2.length(); j++){
dp[i][j] = (dp[i-1][j] && (s1.charAt(i-1) == s3.charAt(i + j -1)))
||(dp[i][j-1] && (s2.charAt(j-1) == s3.charAt(i + j-1)));
}
}
return dp[s1.length()][s2.length()];
}
}
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