/
44.java
306 lines (279 loc) · 10.7 KB
/
44.java
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__________________________________________________________________________________________________
2ms
class Solution {
public boolean isMatch(String s, String p) {
int i=0;
int j=0;
int xindex =-1;
int sxindex = -1;
while(i<s.length()){
if(j<p.length() && (s.charAt(i) == p.charAt(j) || p.charAt(j) == '?')){
i++;
j++;
} else if(j<p.length() && p.charAt(j) == '*'){
xindex = j;
sxindex = i;
j++;
} else if(xindex!=-1){
j = xindex+1;
i = ++sxindex;
} else {
return false;
}
}
while(j<p.length() && p.charAt(j) == '*'){
j++;
}
return j==p.length();
}
}
__________________________________________________________________________________________________
5ms
class Solution {
public boolean isMatch(String s, String p) {
byte[][] results = new byte[s.length()+1][p.length()+1];
StringBuilder sb = new StringBuilder();
//do the easy pattern recognition at the end first
int numStars = 0;
for(int i=0;i<p.length();i++) {
if(p.charAt(i) == '*') {
numStars++;
}
}
return isMatchSub(s,p,0,0,results,numStars);
}
private boolean isMatchSub(String s, String p, int sStartInit, int pStart, byte[][] results, int numStars) {
//check if the min length of p is larger than s
if(p.length()-pStart-numStars > s.length()-sStartInit) {
results[sStartInit][pStart] = 2;
return false;
}
//System.out.println("s="+s.substring(sStartInit)+" p="+p.substring(pStart));
int sStart = sStartInit;
for(int i=pStart;i<p.length();i++) {
//System.out.println("s="+s.substring(sStart)+" p="+p.substring(i));
if(results[sStart][i] != 0) {
return results[sStartInit][i] == 1;
}
if(p.charAt(i) == '*') {
//check the characters after the * to narrow down the recursion
StringBuilder sb = new StringBuilder(10);
boolean reachedEnd = true;
int numQuestions = 0;
int numAsterisk = 0;
for(int j=1;j<p.length()-i;j++) {
//System.out.println("processing p="+p.charAt(i+j)+" sStart="+(sStart+j-1));
if(p.charAt(i+j) != '*') {
if(p.charAt(i+j) != '?') {
sb.append(p.charAt(i+j));
}
else {
if(sb.length() != 0) {
reachedEnd = false;
break;
}
else {
numQuestions++;
}
}
}
else {
if(sb.length() != 0) {
reachedEnd = false;
break;
}
else {
numAsterisk++;
}
}
}
String sub = sb.toString();
//never need to exit since we recursively find the answer here
//System.out.println("sub="+sub+" numQuestions="+numQuestions+" numAsterisk="+numAsterisk);
int index = sStart-1+numQuestions;
//check for early return
while(results[s.length()][p.length()] == 0) {
index = s.indexOf(sub,index+1);
//System.out.println("sub="+sub+" index="+index);
if(index != -1) {
if(isMatchSub(s,p,index+sub.length(),i+1+sub.length()+numQuestions+numAsterisk,results,numStars-1-numAsterisk)) {
results[s.length()][p.length()] = 1;
return true;
}
}
else {
//the required string is not in s, so return false
results[s.length()][p.length()] = 2;
return false;
}
}
return results[s.length()][p.length()] == 1;
}
else if(sStart >= s.length()) {
results[sStartInit][i] = 2;
return false;
}
else if(p.charAt(i) == s.charAt(sStart) || p.charAt(i) == '?') {
sStart++;
}
else {
results[sStartInit][i] = 2;
return false;
}
}
return sStart == s.length();
}
}
__________________________________________________________________________________________________
6ms
class Solution {
public boolean isFirstPosMatch(String s, int spos, String p, int ppos) {
return (spos < s.length() &&
(s.charAt(spos) == p.charAt(ppos) ||
p.charAt(ppos) == '?'));
}
public boolean isMatch(String s, String p) {
int[] scnt = new int[26];
int[] pcnt = new int[26];
for (int i = 0; i < s.length(); i++) {
scnt[s.charAt(i) - 'a']++;
}
for (int i = 0; i < p.length(); i++) {
char ch = p.charAt(i);
if (ch >= 'a' && ch <= 'z') {
pcnt[ch - 'a']++;
}
}
int[][] match = new int[s.length() + 2][p.length() + 2];
return isMatchHelper(s, 0, p, 0, match, scnt, pcnt);
}
public boolean isMatchHelper(String s, int spos, String p, int ppos, int[][] match, int[] scnt, int[] pcnt) {
if (match[spos][ppos] != 0) {
return match[spos][ppos] == 1;
}
if (ppos == p.length()) {
match[spos][ppos] = spos == s.length() ? 1 : -1;
return match[spos][ppos] == 1;
}
if (p.charAt(ppos) != '*') {
boolean ok = isFirstPosMatch(s, spos, p, ppos);
if (ok) {
scnt[s.charAt(spos) - 'a']--;
if (p.charAt(ppos) != '?') {
pcnt[p.charAt(ppos) - 'a']--;
}
ok &= isMatchHelper(s, spos + 1, p, ppos + 1, match, scnt, pcnt);
if (p.charAt(ppos) != '?') {
pcnt[p.charAt(ppos) - 'a']++;
}
scnt[s.charAt(spos) - 'a']++;
}
match[spos][ppos] = ok ? 1 : -1;
return ok;
}
while (ppos < p.length() && p.charAt(ppos) == '*') {
ppos++;
}
while (spos < s.length() && pcnt[s.charAt(spos) - 'a'] <= scnt[s.charAt(spos) - 'a']) {
match[spos][ppos] = isMatchHelper(s, spos, p, ppos, match, scnt, pcnt) ? 1 : -1;
if (match[spos][ppos] == 1) {
return true;
}
scnt[s.charAt(spos) - 'a']--;
spos++;
}
match[spos][ppos] = isMatchHelper(s, spos, p, ppos, match, scnt, pcnt) ? 1 : -1;
return match[spos][ppos] == 1;
}
}
__________________________________________________________________________________________________
36316 kb
class Solution {
public boolean isMatch(String s, String p) {
boolean[][] dp = new boolean[p.length()][s.length()];
if (s.length() == 0 && p.length() == 0) {
return true;
} else if (p.length() == 0) {
return false;
} else if (s.length() == 0) {
for (int i = 0; i < p.length(); i++) {
if (p.charAt(i) != '*') {
return false;
}
}
return true;
}
boolean used = false;
for (int i = 0; i < p.length(); i++) {
if (i == 0 || dp[i - 1][0]) {
if (p.charAt(i) == '*') {
dp[i][0] = true;
} else if (!used && (p.charAt(i) == s.charAt(0) || p.charAt(i) == '?')) {
used = true;
dp[i][0] = true;
}
}
}
used = false;
for (int j = 0; j < s.length(); j++) {
if (j == 0 || dp[0][j - 1]) {
if (p.charAt(0) == '*') {
dp[0][j] = true;
} else if (!used && (p.charAt(0) == s.charAt(j) || p.charAt(0) == '?')) {
used = true;
dp[0][j] = true;
}
}
}
for (int j = 1; j < s.length(); j++) {
for (int i = 1; i < p.length(); i++) {
if (p.charAt(i) == '*' && (dp[i][j - 1] || dp[i - 1][j - 1] || dp[i - 1][j])) {
dp[i][j] = true;
} else if ((p.charAt(i) == '?' || p.charAt(i) == s.charAt(j)) && dp[i - 1][j - 1]) {
dp[i][j] = true;
}
}
}
return dp[p.length() - 1][s.length() - 1];
}
}
__________________________________________________________________________________________________
class Solution {
public boolean isMatch(String s, String p) {
if (s == null || p == null)
return false;
if (p.length() == 0){
return s.length() == 0;
}
boolean[][] dp = new boolean[p.length()][s.length() + 1];
char[] string = s.toCharArray();
char[] pattern = p.toCharArray();
switch (pattern[0]) {
case '*':
for (int j = 0; j <= string.length; j++) {
dp[0][j] = true;
}
break;
case '?':
if (s.length() > 0)
dp[0][1] = true;
break;
default:
if (s.length() > 0 && pattern[0] == string[0])
dp[0][1] = true;
}
for (int i = 1; i < pattern.length; i++) {
if (dp[i - 1][0] && pattern[i] == '*')
dp[i][0] = true;
for (int j = 1; j <= string.length; j++) {
if (pattern[i] == '*' && (dp[i - 1][j] || dp[i][j - 1])) {
dp[i][j] = true;
}
if (pattern[i] == string[j - 1] || pattern[i] == '?')
dp[i][j] = dp[i - 1][j - 1];
}
}
return dp[p.length() - 1][s.length()];
}
}
__________________________________________________________________________________________________