Submission #16257

#	Time	Username	Problem	Language	Result	Execution time	Memory
16257		CodingBug	Crayfish scrivener (IOI12_scrivener)	C++98	34 / 100	1000 ms	199760 KiB

scrivener

#include <algorithm>
#include <vector>
#define M 1000000
using namespace std;

struct Node{
    char c;
    int h;
    Node *nxt;
    vector<Node *> par;
};

Node *a[M+1];
int t;

void Init() {
    a[t=0]=new Node();
}

void TypeLetter(char L) {
    a[t]->nxt=a[t+1]=new Node();
    a[t+1]->c=L;
    a[t+1]->h=a[t]->h+1;
    Node *p=a[t];
    while(p){
        a[t+1]->par.push_back(p);
        p=p->par.size()>=a[t+1]->par.size() ? p->par[a[t+1]->par.size()-1] : NULL;
    }
    t++;
}

void UndoCommands(int U) {
    a[t+1]=a[t-U];
    t++;
}

char GetLetter(int P) {
    Node *p=a[t];
    P=p->h-P-1;
    for(int i=0;P;i++){
        if((1<<i)&P){
            P-=(1<<i);
            p=p->par[i];
        }
    }
    return p->c;

}

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