Submission #197030

#	Time	Username	Problem	Language	Result	Execution time	Memory
197030		dennisstar	Crayfish scrivener (IOI12_scrivener)	C++11	34 / 100	718 ms	262144 KiB

scrivener

#include <bits/stdc++.h>
#define fi first
#define se second
#define ryan bear
#define all(V) (V).begin(), (V).end()
#define unq(V) (V).erase(unique(all(V)), (V).end())
#define fastio ios::sync_with_stdio(false); cin.tie(0)
using namespace std;
typedef long long ll;
typedef vector<ll> vlm;
typedef vector<int> vim;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

struct node {
	char ch;
	node *l, *r;
	node() { ch=0; l=r=NULL; }
}*root[1000010];
int sz[1000010], tp;

void upd(node *now, node *nd, int t, int s, int e, char val) {
	if (s==e) { now->ch=val; return ; }
	int md=(s+e)/2;
	if (t<=md) {
		now->l=new node();
		now->r=(nd?nd->r:NULL);
		upd(now->l, nd?nd->l:NULL, t, s, md, val);
	}
	else {
		now->l=(nd?nd->l:NULL);
		now->r=new node();
		upd(now->r, nd?nd->r:NULL, t, md+1, e, val);
	}
}
char get(node *now, int t, int s, int e) {
	if (s==e) return now->ch;
	int md=(s+e)/2;
	if (t<=md) return get(now->l, t, s, md);
	else return get(now->r, t, md+1, e);
} 

void Init() { root[0]=new node(); tp=1; memset(sz, 0, sizeof(sz)); }

void TypeLetter(char L) {
	root[tp]=new node();
	sz[tp]=sz[tp-1]+1;
	upd(root[tp], root[tp-1], sz[tp], 1, 1000000, L);
	tp++;
}

void UndoCommands(int U) { 
	assert(tp-U-1>=0);
	root[tp]=root[tp-U-1]; sz[tp]=sz[tp-U-1]; tp++;
}

char GetLetter(int P) {
	assert(sz[tp-1]>=P+1);
	return get(root[tp-1], P+1, 1, 1000000);
}

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