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public class InterleavingString {
public boolean isInterleave(String s1, String s2, String s3) {
if (s1 == null || s1.isEmpty()) {
return s2.equals(s3);
}
if (s2 == null || s2.isEmpty()) {
return s1.equals(s3);
}
if (s3 == null || s3.isEmpty()) {
return false;
}
int l1 = s1.length();
int l2 = s2.length();
int l3 = s3.length();
if (l1 + l2 != l3) {
return false;
}
boolean[][] map = new boolean[l1 + 1][l2 + 1];
for (int i = 0; i < l2; i++) {
if (s2.charAt(i) == s3.charAt(i)) {
map[0][i + 1] = true;
} else {
break;
}
}
for (int i = 0; i < l1; i++) {
if (s1.charAt(i) == s3.charAt(i)) {
map[i + 1][0] = true;
} else {
break;
}
}
for (int i = 1; i <= l1; i++) {
for (int j = 1; j <= l2; j++) {
map[i][j] = (map[i - 1][j] && s1.charAt(i - 1) == s3.charAt(i + j - 1)) || (map[i][j - 1]
&& s2.charAt(j - 1) == s3.charAt(i + j - 1));
}
}
return map[l1][l2];
}
}
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