Submission #104404

#	Time	Username	Problem	Language	Result	Execution time	Memory
104404		wilwxk	Crayfish scrivener (IOI12_scrivener)	C++11	34 / 100	1071 ms	75832 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

const int MAXN=1e6+3;
const int LOGN=22;
int cont[MAXN], letra[MAXN];
int dp[MAXN][LOGN+3];
int contv=0;

void update(int cur) {
	int aux=dp[cur][0];
	for(int i=1; i<=LOGN; i++) {
		dp[cur][i]=dp[aux][i-1];
		aux=dp[cur][i];
	}
}

void Init() {}

void TypeLetter(char cur) {
	contv++; int pai=contv-1;
	if(pai==0) pai=contv;
	letra[contv]=cur;
	cont[contv]=cont[pai]+1;
	dp[contv][0]=pai;
	update(contv);
}

void UndoCommands(int val) {
	contv++; int pai=contv-1-val;
	if(pai==0) pai=contv;
	cont[contv]=cont[pai];
	dp[contv][0]=pai;
	update(contv);
}

char GetLetter(int ind) {
	int cur=contv;

	int aux=cur;
	while(aux!=dp[aux][0]&&cont[dp[aux][0]]!=ind) aux=dp[aux][0];

	return letra[aux];
}

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