day 55

1281.整数的各位积和之差

int subtractProductAndSum(int n){
    int x=1,y=0;
    while(n!=0){
        x*=n%10;
        y+=n%10;
        n/=10;
    }
    return x-y;
}

1389.按既定顺序创建目标数组

class Solution {
public:
    vector<int> createTargetArray(vector<int>& nums, vector<int>& index) {
        vector<int> a;
        for(int i=0;i<nums.size();i++){
            a.insert(a.begin()+index[i],nums[i]);
        }
        return a;
    }
};