LeetCode25:Remove Duplicates from Sorted Array

Given a sorted array, remove the duplicates in place such that each element appear only once and return
the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

For example,

Given input array A =

[1,1,2]

,

Your function should return length =

2

,
and A is now

[1,2]

.

public class Solution {
public int removeDuplicates(int[] A) {
// Start typing your Java solution below
// DO NOT write main() function
if(A.length<1)
return 0;
int curValue=A[0];
int curIndex=1;
for(int i=1; i<A.length; i++){
if(curValue!=A[i]){
curValue=A[i];
if(curIndex!=i)
A[curIndex]=A[i];
curIndex++;
}
}
return curIndex;
}
}

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LL's solution:

public class Solution {
public int removeDuplicates(int[] A) {
// Start typing your Java solution below
// DO NOT write main() function
int len = A.length;
if(len<2)
return len;
int start = 0, window = 1;
int current = A[start];
while(start+window<len){
if(current<A[start+window]){
start++;
current = A[start];
if(window!=1){   // repeating
window--;
A[start] = A[start+window];
current = A[start];
}
}
else{
window++;
}
}
return start+1;
}
}