【leetcode 位运算（不是） C++】645. Set Mismatch

645. Set Mismatch

class Solution {
    
    
public:
    vector<int> findErrorNums(vector<int>& nums) {
    
    
        vector<int> V(nums.size() + 1, 0);
        for(auto num : nums) V[num]++;
        vector<int> ans(2, 0);
        for(int ii = 1; ii < V.size(); ii++) {
    
    
            if(V[ii] == 2) ans[0] = ii;
            if(V[ii] == 0) ans[1] = ii;
        }
        return ans;
    }
};