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1177.java
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1177.java
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__________________________________________________________________________________________________
sample 4 ms submission
class Solution {
public List canMakePaliQueries(String s, int[][] queries) {
int[] cache = new int[s.length() + 1];
for(int i = 0; i < s.length(); i++) {
cache[i + 1] = cache[i] ^ (1 << (s.charAt(i) - 'a'));
}
List ans = new ArrayList<>();
for(int[] query : queries) {
if(query[2] >= 13) {
ans.add(true);
}
else {
int cnt = convert(cache[query[1] + 1] ^ cache[query[0]]); //convert bitmap form to number
if(query[2] < cnt / 2) ans.add(false);
else ans.add(true);
}
}
return ans;
}
private int convert(int num) {
int cnt = 0;
while(num > 0) {
cnt += num % 2;
num /= 2;
}
return cnt;
}
}
__________________________________________________________________________________________________
sample 5 ms submission
class Solution {
public List canMakePaliQueries(String s, int[][] queries) {
int[] cache = new int[s.length() + 1];
int uniqueCharCounter = 0;
for(int i = 0; i < s.length(); i++) {
int bitmap = 1 << (s.charAt(i) - 'a');
if((uniqueCharCounter & bitmap) != 0) uniqueCharCounter -= bitmap;
else uniqueCharCounter += bitmap;
cache[i + 1] = uniqueCharCounter;
}
List ans = new ArrayList<>();
for(int[] query : queries) {
if(query[2] >= 13) {
ans.add(true);
continue;
}
int uni = cache[query[1] + 1] ^ cache[query[0]]; // unique characters in substring
int cnt = convert(uni); //convert bitmap form to number
if(query[2] < cnt / 2) ans.add(false);
else ans.add(true);
}
return ans;
}
private int convert(int num) {
int cnt = 0;
while(num > 0) {
cnt += num % 2;
num /= 2;
}
return cnt;
}
}
__________________________________________________________________________________________________