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RemoveDuplicates.java
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53 lines (43 loc) · 1.14 KB
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package com.leetcode.array;
public class RemoveDuplicates {
public int removeDuplicatesOptimized(int []nums){
int n = nums.length;
if(n<=2){
return n;
}
int slow=2,fast =2;
while (fast<n){
if(nums[slow-2]!=nums[fast]){
nums[slow] = nums[fast];
slow++;
}
fast++;
}
return slow;
}
public int removeDuplicates(int[] nums) {
int pos =0;
int head=0,tail=1;
while (tail<nums.length){
if(nums[head]!=nums[tail]){
if(tail>=head+2){
nums[pos++] = nums[head];
nums[pos++] = nums[head + 1];
}else {
nums[pos++] =nums[head];
}
head = tail;
tail = head+1;
}else{
tail++;
}
}
if(head==nums.length-1){
nums[pos++] = nums[head];
}else if(head<=nums.length-2){
nums[pos++] = nums[head];
nums[pos++] = nums[head + 1];
}
return pos;
}
}