Submission #467783

#	Time	Username	Problem	Language	Result	Execution time	Memory
467783		Karliver	Crayfish scrivener (IOI12_scrivener)	C++14	100 / 100	409 ms	67272 KiB

scrivener

    
#include <bits/stdc++.h>

#define FIXED_FLOAT(x)  std::fixed <<std::setprecision(20) << (x)
#define all(v) (v).begin(), (v).end()
using namespace  std;
#define forn(i,n) for (int i = 0; i < (n); ++i)
#define rforn(i, n) for(int i = (n) - 1;i >= 0;--i)
using ll = long long;
int mod = (ll)1e9 + 7;
#define PI acos(-1)
typedef pair<int, int> pairs;

const int INF = 1e9 + 1;
const int N = 1e6 + 3;
const double eps = 1e-7;

template <class T> using V = vector<T>;  
template <class T> using VV = V<V<T>>;  

template <typename XPAX>
void ckma(XPAX &x, XPAX y) {
    x = (x < y ? y : x);
}
template <typename XPAX>
void ckmi(XPAX &x, XPAX y) {
    x = (x > y ? y : x);
}

int head[N], len[N], cur, nxt, com;
int pre[N][20];
char last[N];
void Init() {
    cur = nxt = 0;
    head[0] = 0;
    com = 0;
    forn(i, 20) pre[0][i] = 0;
    ++nxt;
}
void TypeLetter(char L) {
    len[nxt] = len[cur] + 1;
    last[nxt] = L;
    int x = cur;
    forn(i, 20) {
        pre[nxt][i] = x;
        x = pre[x][i];
    }
    head[++com] = cur = nxt++;
}

void UndoCommands(int U) {
    com++;
    head[com] = cur = head[com - U - 1];
}
char GetLetter(int P) {
    int dx = len[cur] - P - 1;
    int u = cur;
    forn(i, 20) if(dx >> i & 1) u = pre[u][i];

    return last[u];
}

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