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53 lines (31 loc) · 671 Bytes
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54.java
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53 lines (31 loc) · 671 Bytes
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class Solution {
public int missingNumber(int[] nums) {
if(nums.length==0)
{
return 0;
}
if(nums.length==1&&nums[0]!=0)
{
return 0;
}
if(nums[nums.length-1]==nums.length-1)
{
return nums.length;
}
int left = 0,right=nums.length-1;
int mid = 0;
while(left<right)
{
mid = left+(right-left)/2;
if(nums[mid]==mid)
{
left = mid+1;
}
else
{
right = mid;
}
}
return right;
}
}