leetcode 448 Find All Numbers Disappeared in an Array
class Solution {
public List<Integer> findDisappearedNumbers(int[] nums) {
int n = nums.length;
ArrayList<Integer> ans = new ArrayList<Integer>();
boolean[] vis = new boolean[n+1];
for(int i=0;i<n;i++){
vis[nums[i]] = true;
}
for(int i=1;i<=n;i++){
if(!vis[i]) ans.add(i);
}
return ans;
}
}
時間復雜度O(n)，空間復雜度O(n)。空間復雜度O(1)的不會做- -待補
leetcode 448 Find All Numbers Disappeared in an Array
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