Submission #416976

#	Time	Username	Problem	Language	Result	Execution time	Memory
416976		snasibov05	Crayfish scrivener (IOI12_scrivener)	C++14	60 / 100	1088 ms	162084 KiB

scrivener

#include <vector>
#include <string>

using namespace std;

#define pb push_back

const int lg = 20;

struct node{
    char val;
    int idx;
    vector<node*> pr;
    node(char c){
        val = c;
        idx = 0;
        pr.resize(lg);
        pr.assign(lg, nullptr);
    }
};

string res;
vector<node*> v;

void Init() {}

void TypeLetter(char l) {
    node* cur = new node(l);
    if (!v.empty()) {
        cur->pr[0] = v.back();
        cur->idx = cur->pr[0]->idx + 1;
    }
    for (int i = 1; i < lg; ++i){
        if (cur->pr[i-1] == nullptr) break;
        cur->pr[i] = cur->pr[i-1]->pr[i-1];
    }
    v.pb(cur);
}

void UndoCommands(int u) {
    int n = v.size();
    node* cur = v[n - u - 1];
    v.pb(cur);
}

char GetLetter(int p) {
    node* cur = v.back();
    for (int i = lg - 1; i >= 0; --i){
        if (cur->pr[i] != nullptr && cur->pr[i]->idx >= p){
            cur = cur->pr[i];
        }
    }
    return cur->val;
}

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