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125.java
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125.java
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__________________________________________________________________________________________________
sample 1 ms submission
class Solution {
private static final char[]charMap = new char[256];
static{
for(int i=0;i<10;i++){
charMap[i+'0'] = (char)(1+i); // numeric
}
for(int i=0;i<26;i++){
charMap[i+'a'] = charMap[i+'A'] = (char)(11+i); //alphabetic, ignore cases
}
}
public boolean isPalindrome(String s) {
char[]pChars = s.toCharArray();
int start = 0,end=pChars.length-1;
char cS,cE;
while(start<end){
cS = charMap[pChars[start]];
cE = charMap[pChars[end]];
if(cS!=0 && cE!=0){
if(cS!=cE)return false;
start++;
end--;
}else{
if(cS==0)start++;
if(cE==0)end--;
}
}
return true;
}
}
__________________________________________________________________________________________________
sample 34484 kb submission
class Solution {
public boolean isPalindrome(String s) {
int i = 0;
int j = s.length() - 1;
while(i < j){
char c1 = s.charAt(i);
char c2 = s.charAt(j);
if(!isAlphaNumeric(c1)){
i++;
continue;
}
if(!isAlphaNumeric(c2)){
j--;
continue;
}
if((c1 == c2) || (c1 - 'a' == c2 - 'A' && c1 - 'a' >= 0 && c1 - 'a' <= 25 && c2 - 'A' >= 0 && c2 - 'A' <= 25) || (c1 - 'A' == c2 - 'a' && c2 - 'a' >= 0 && c2 - 'a' <= 25 && c1- 'A' >= 0 && c1 - 'A' <= 25)){
i++;
j--;
}
else{
return false;
}
}
return true;
}
private boolean isAlphaNumeric(char c){
return (c - 'a' >= 0 && c - 'a' <= 25) || ((c - 'A' >= 0 && c - 'A' <= 25)) || (c >= '0' && c <= '9');
}
}
__________________________________________________________________________________________________