Submission #416982

#	Time	Username	Problem	Language	Result	Execution time	Memory
416982		snasibov05	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	950 ms	90708 KiB

scrivener

#include <vector>
#include <string>

using namespace std;

#define pb push_back

const int lg = 20;

//vector<node*> v;

vector<int> idx;
vector<char> val;
vector<vector<int>> pr;
vector<int> v;

int k = 1;

void Init() {
    v.pb(0);
    idx.pb(-1);
    val.pb(' ');
    pr.pb(vector<int>(lg, -1));
}

void TypeLetter(char l) {
    int prev = v.back();
    v.pb(k++);
    idx.pb(idx[prev] + 1);
    val.pb(l);
    pr.pb(vector<int>(lg));
    if (prev == 0) prev = -1;
    pr.back()[0] = prev;
    for (int i = 1; i < lg; ++i){
        if (pr.back()[i-1] == -1) break;
        pr.back()[i] = pr[pr.back()[i-1]][i-1];
    }
}

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

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

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