Submission #417056

#	Time	Username	Problem	Language	Result	Execution time	Memory
417056		Emin2004	Crayfish scrivener (IOI12_scrivener)	C++14	34 / 100	240 ms	262148 KiB

scrivener

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

#define ll long long
#define pb push_back
#define pii pair<int, int>
#define F first
#define S second

const int N = 1000005;
const int mod = 1e9+7;

struct P{
    int type;
    char ch;
    int num;
};

string s = "", res[N];
int m = 0, lastty = 0;
P a[N];

string get(int idx){
    if(idx < 0) return "";
    if(res[idx] != "") return res[idx];
    if(a[idx].type == 1){
        return res[idx] = get(idx - 1) + a[idx].ch;
    }
    else return res[idx] = get(idx - 1 - a[idx].num);
}

void Init() {}

void TypeLetter(char L) {
    a[m].type = 1;
    a[m].num = 0;
    a[m].ch = L;
    m++;
    lastty = 1;
}

void UndoCommands(int U) {
    a[m].type = 2;
    a[m].num = U;
    a[m].ch = '1';
    m++;
    lastty = 2;
}

char GetLetter(int P) {
    if(lastty != 3){
        s = get(m - 1);
    }
    lastty = 3;
    return s[P];
}

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