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Method 1: Continuous double pointer flipping
class Solution {
public String reverseLeftWords(String s, int n) {
StringBuffer sb = new StringBuffer(s);
reverseWord(sb,0,n-1);
reverseWord(sb,n,sb.length()-1);
return sb.reverse().toString();
}
public void reverseWord(StringBuffer s , int start ,int end){
while(start<end){
char temp = s.charAt(start);
s.setCharAt(start,s.charAt(end));
s.setCharAt(end,temp);
start++;
end --;
}
}
}