Submission #239408

#	Time	Username	Problem	Language	Result	Execution time	Memory
239408		aggu_01000101	Crayfish scrivener (IOI12_scrivener)	C++14	34 / 100	661 ms	262148 KiB

scrivener

#include <bits/stdc++.h>
#define int long long
#define INF 1000000000000000
#define lchild(i) (i*2 + 1)
#define rchild(i) (i*2 + 2)
#define mid(l, u) ((l+u)/2)
#define x(p) p.first
#define y(p) p.second
#define MOD 998244353
using namespace std;
struct node{
    node* left;
    node* right;
    char val;
};
node* version[(int)1e6 + 5];
signed ptr[(int)1e6 + 5];
signed ind = 1;
char query(int l, int u, int ll, node* curr){
    if(l>=ll && u<=ll) return curr->val;
    if(ll<=mid(l, u)){
        return query(l, mid(l, u), ll, curr->left);
    }
    return query(mid(l, u)+1, u, ll, curr->right);
}
node* update(int l, int u, node* curr, node* prev, int ll, char v){
    //cout<<"update "<<l<<" "<<u<<" "<<ll<<" "<<v<<"\n";
    if(l>=ll && u<=ll){
        curr -> val = v;
        return curr;
    }
    if(ll<=mid(l, u)){
          curr->left = new node;
        if(prev!=nullptr) curr -> left = update(l, mid(l, u), curr->left, prev->left, ll, v);
        else curr->left = update(l, mid(l, u), curr->left, nullptr, ll, v);
         if(prev!=nullptr) curr -> right = prev -> right;
         return curr;
    }
    if(curr->right == nullptr) curr->right = new node;
    if(prev!=nullptr) curr -> right = update(mid(l, u)+1, u, curr->right, prev->right, ll, v);
    else curr -> right = update(mid(l, u)+1, u, curr->right, nullptr, ll, v);
    if(prev!=nullptr) curr -> left = prev -> left;
    return curr;
}
void Init(){
    version[0] = new node;
    ptr[0] = 0;
}
void TypeLetter(char l){
    version[ind] = update(0, 1000000, new node, version[ind - 1], ptr[ind-1], l);
    ptr[ind] = ptr[ind-1] + 1;
    ind++;
}
void UndoCommands(signed u){
    version[ind] = version[ind-1-u];
    ptr[ind] = ptr[ind - 1 - u];
    ind++;
}
char GetLetter(signed p){
    return query(0, 1000000, p, version[ind - 1]);
}
/*signed main(){
    Init();
    int q;
    cin>>q;
    while(q--){
        int type;
        cin>>type;
        if(type==1){
            char l;
            cin>>l;
            TypeLetter(l);
        }
        else if(type==2){
            int u;
            cin>>u;
            UndoCommands(u);
        }
        else{
            int pos;
            cin>>pos;
            cout<<GetLetter(pos)<<endl;
        }
    }
}*/
/*
 1 a
 1 b
 3 1
 1 d
 2 2
 2 1
 3 2
 1 e
 2 1
 2 5
 1 c
 3 2
 2 2
 3 2
 */

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 22 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40