Software Engineer

Tip 1:five DDL commands in SQL:
CREATE Command
DROP Command
ALTER Command
TRUNCATE Command
RENAME Command
Tip 2:
Tip 3:

I make the first string mutuable then i make stringBuilder.
String reverseWords(String S)
{
StringBuilder sb=new StringBuilder();
int l=S.length();
int temp=l-1;
int j=0;
int count=0;
for(int i=l-1;i>=0;i--){
if(S.charAt(i)=='.')
{
if(count==0){
j=i;
sb.append(S.substring(j+1,temp+1));
temp=j;
count++;
sb.append('.');
}
else{
j=i;
sb.append(S.substring(j+1,temp+1));
temp=j; 
}

//sb.append('.');

}
}
if(sb.length()==0){
sb.append(S);
}
sb.append(S.substring(0,j));
return sb.toString();

}

Firstly i create Array list to add the numbers of array

static ArrayList subarraySum(int[] arr, int n, int s) 
{
ArrayList list = new ArrayList<>();

int sum=0 , count=0;
for(int i=0; is){
sum = sum - arr[count];
count++;
}
if(sum == s){
list.add(0,count+1);
list.add(1,i+1);
return list;
}
}
list.add(0,-1);
return list;


}