Submission #310882

#	Time	Username	Problem	Language	Result	Execution time	Memory
310882		tengiz05	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	501 ms	63144 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
const int N = 1e6+5;
int up[N][20], depth[N], pos[N];
char a[N];
int cur=0, timer=0, node=0;
void Init() {
	return;
}
void TypeLetter(char L) {
	timer++;
	node++;
	a[node] = L;
	up[node][0] = cur;
	depth[node] = depth[cur]+1;
	cur = node;
	pos[timer] = cur;
	for(int i=1;i<20;i++){
		up[cur][i] = up[up[cur][i-1]][i-1];
	}return;
}

void UndoCommands(int U) {
	cur = pos[timer-U];
	timer++;
	pos[timer] = cur;
}
char GetLetter(int P) {
	int need = depth[cur]-P-1;
	int u=cur;
	for(int i=0;i<20;i++){
		if((1<<i) & need)u = up[u][i];
	}return a[u];
}

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