Submission #329217

#	Time	Username	Problem	Language	Result	Execution time	Memory
329217		sofapuden	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	770 ms	133996 KiB

scrivener

#include <bits/stdc++.h>

using namespace std;

const int mxN = 1e6+5;

vector<int> de(mxN), po(mxN);
vector<vector<int>> up(mxN,vector<int>(20));
vector<char> ou(mxN);
int cu1 = 0, cu2 = 0, cu3 = 0;

void Init() {}

void TypeLetter(char L) {
	cu1++;
	cu2++;
	ou[cu2] = L;
	up[cu2][0] = cu3;
	de[cu2] = de[cu3]+1;
	cu3 = cu2;
	po[cu1] = cu3;
	for(int i = 1; i < 20; ++i){
		up[cu3][i] = up[up[cu3][i-1]][i-1];
	}
}

void UndoCommands(int U) {
	cu3 = po[cu1-U];
	po[++cu1] = cu3;

}

char GetLetter(int P) {
	int get = de[cu3]-P-1;
	int ind = cu3;
	for(int i = 0; i < 20; ++i){
		if((1<<i)&get)ind = up[ind][i];
	}return ou[ind];
		

}

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