Cod sursa(job #1816888)

Utilizator TincaMateiTinca Matei TincaMatei Data 27 noiembrie 2016 03:29:44
Problema Secv8 Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 2.69 kb
#include <cstdio>
#include <cstdlib>
#include <time.h>

typedef struct _T {
  _T *l, *r;
  int v, p, s;
  bool lz;
  _T(int k) {
    v = k;
    l = r = NULL;
    s = 1;
    p = rand() ^ rand();
    l = false;
  }

  ~_T() {delete r; delete l;};

  void rec() {
    s = 1;
    prop();
    if(l != NULL) s += l -> s;
    if(r != NULL) s += r -> s;
  }
  void prop() {
    if(lz == true) {
      lz = false;
      _T *aux;
      aux = l;
      l = r;
      r = aux;
      if(l != NULL) l -> lz ^= 1;
      if(r != NULL) r -> lz ^= 1;
    }
  }
} *T;

void rec(T x) { if(x != NULL) x -> rec(); }

int getSize(T x) {
  if(x == NULL) return 0;
  rec(x);
  return x -> s;
}

void split(T x, int p, T &l, T &r, int ex) {
  l = r = NULL;
  if(x == NULL) return;
  rec(x);
  int poz = 1 + ex + getSize(x -> l);
  if(poz < p) {
    split(x -> r, p, x -> r, r, poz);
    l = x;
    rec(l);
  } else {
    split(x -> l, p, l, x -> l, ex);
    r = x;
    rec(r);
  }
}

T join(T l, T r) {
  rec(l);
  rec(r);
  if(l == NULL) return r;
  if(r == NULL) return l;
  if(l -> p < r -> p) {
    l -> r = join(l -> r, r);
    rec(l);
    return l;
  } else {
    r -> l = join(l, r -> l);
    rec(r);
    return r;
  }
}

T add(T x, int k, int e) {
  T l, r;
  split(x, k, l, r, 0);
  return join(join(l, new _T(e)), r);
}

T erase(T x, int p1, int p2) {
  T l, m, r;
  split(x, p2 + 1, m, r, 0);
  split(m, p1, l, m, 0);
  delete m;
  return join(l, r);
}

T reverse(T x, int p1, int p2) {
  T l, m, r;
  split(x, p2 + 1, m, r, 0);
  split(m, p1, l, m, 0);
  m -> lz = true;
  return join(join(l, m), r);
}

int acces(T x, int k, int ex) {
  int poz;
  rec(x);
  poz = 1 + ex + getSize(x -> l);
  if(poz == k)
    return x -> v;
  else if(poz < k)
    return acces(x -> r, k, poz);
  else
    return acces(x -> l, k, ex);
}

int main() {
  int n, bit, a1, a2;
  char ch;
  T t = NULL;
  FILE *fin = fopen("secv8.in", "r");
  FILE *fout = fopen("secv8.out", "w");
  fscanf(fin, "%d%d", &n, &bit);
  for(int i = 0; i < n; ++i) {
    ch = fgetc(fin);
    while(ch == ' ' || ch == '\n')
      ch = fgetc(fin);
    if(ch == 'I') {
      fscanf(fin, "%d%d", &a1, &a2);
      t = add(t, a1, a2);
    } else if(ch == 'D'){
      fscanf(fin, "%d%d", &a1, &a2);
      t = erase(t, a1, a2);
    } else if(ch == 'R'){
      fscanf(fin, "%d%d", &a1, &a2);
      t = reverse(t, a1, a2);
    } else if(ch == 'A'){
      fscanf(fin, "%d", &a1);
      fprintf(fout, "%d\n", acces(t, a1, 0));
    }
  }
  rec(t);
  n = t -> s;
  for(int i = 1; i <= n; ++i)
    fprintf(fout, "%d ", acces(t, i, 0));
  fclose(fout);
  fclose(fin);
  return 0;
}