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https://leetcode.com/problems/reverse-words-in-a-string-ii/

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class Solution {
    private void reverse(char[] s,int l,int r){
        while(l<r){
            char tmp=s[r];
            s[r--]=s[l];
            s[l++]=tmp;
            // l++;
            // r--;
        }
    }
    public void reverseWords(char[] s) {
        if(s==null||s.length==0) return;
        int l=0,r=s.length-1;
        reverse(s,l,r);
        
        int j=0;
        for(int i=0;i<s.length;i=j+1){
            j=i;
            while(j<s.length&&s[j]!=' ') j++;
            reverse(s,i,j-1);
        }
    }
}
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