pavanilla

class trienode{
    public:
    int sum;
    vector<trienode*>children;
    trienode():sum(0),children(26){}
    trienode(int val):sum(val),children(26){}
    ~trienode(){
        for(int i=0;i<26;i++){
            if(children[i]) delete children[i];
            children[i]=nullptr;