Submission #286606

#	Time	Username	Problem	Language	Result	Execution time	Memory
286606		amiratou	Crayfish scrivener (IOI12_scrivener)	C++14	34 / 100	1054 ms	124664 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int LOG=20,MX=(int)(1e6+1);

int up[MX][LOG],d[MX],idx;
char car[MX];
vector<int> vec[MX];
 
void Init() {
 
}
 
void TypeLetter(char L) {
	vec[idx].pb(idx+1);
	d[idx+1]=d[idx]+1;
	up[idx+1][0]=idx;
	for (int i = 1; i < LOG; ++i)
		up[idx+1][i]=up[up[idx+1][i-1]][i-1];
	car[idx+1]=L;
	idx++;
}
 
void UndoCommands(int U) {
	d[idx+1]=d[idx-U];
	up[idx+1][0]=up[idx-U][0];
	for (int i = 1; i < LOG; ++i)
		up[idx+1][i]=up[up[idx+1][i-1]][i-1];
	if(idx!=U){
		vec[up[idx-U][0]].pb(idx+1);
		car[idx+1]=car[idx-U];
	}
	idx++;
}
 
char GetLetter(int P) {
	int k=d[idx]-1-P,a=idx;
	for (int i = 0; i < LOG; ++i)
		if((k>>i)&1)a=up[a][i];
	return car[a];
 
}

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