Submission #1042539

#	Time	Username	Problem	Language	Result	Execution time	Memory
1042539		sleepntsheep	Inside information (BOI21_servers)	C11	50 / 100	3587 ms	171088 KiB

servers

#include <stdio.h>
#include <stdlib.h>

int max(int i, int j) { return i > j ? i : j; }
/*
 * Try merge small 2 large, with persistent ds -> O(nlg^2n)
 * How to maintain "frequency" of each data chunk ? ?? 
 *
 */

#define N 120001
#define B 200
#define M 30000000

int n, q, L[M], R[M], A[M], alc, root[N], temp, dp[N], counted[N];
int p2(int l, int r, int x) {
  int p = ++alc;
  A[p] = A[L[p]=l] + A[R[p]=r] + x;
  return p;
}
int pbuild(int l, int r) {
  return l == r ? ++alc : p2(pbuild(l, (l+r)/2), pbuild((l+r)/2+1, r), 0);
}
int pupd(int v, int l, int r, int p) {
  if (l == r) return p2(0, 0, 1);
  if (p <= (l+r)/2) return p2(pupd(L[v], l, (l+r)/2, p), R[v], 0);
  return p2(L[v], pupd(R[v], (l+r)/2+1, r, p), 0);
}
int pqry(int v, int l, int r, int k) {
  if (l == r) return l;
  if (A[L[v]] < k) return pqry(R[v], (l+r)/2+1, r, k - A[L[v]]);
  return pqry(L[v], l, (l+r)/2, k);
}
int ppt(int v, int l, int r, int p) {
  if (l == r) return A[v];
  return p <= (l+r)/2 ? ppt(L[v], l, (l+r)/2, p) : ppt(R[v], (l+r)/2+1, r, p);
}

int l[N], r[N], k, ds[N], k2;
int find(int i) { return ds[i] == i ? i : (ds[i] = find(ds[i])); }
void run() {
  for (int i = 1; i <= n; ++i) dp[i] = 1;
  for (int i = k; i < k2; ++i)
    ds[find(l[i])] = find(r[i]);
  for (int i = k2 - 1; i >= 0; --i) {
    int y = dp[r[i]];
    dp[r[i]] += dp[l[i]];
    dp[l[i]] += y;
  }
  k = k2;
}

int main() {
  scanf("%d%d", &n, &q);

  root[0] = pbuild(1, n);
  for (int i = 1; i <= n; ++i) root[i] = pupd(root[0], 1, n, i),
    dp[i] = 1, ds[i] = i;

  q = n + q - 1;
  for (int i = 1; i <= q; ++i) {
    char type[2];
    int a, b;
    scanf(" %s%d", type, &a);
    if ('S' == type[0]) {
      scanf("%d", &b);
      if (A[root[a]] > A[root[b]])
        temp = a, a = b, b = temp;
      int tot = A[root[a]], at = 0;
      while (at < tot)
        root[b] = pupd(root[b], 1, n, pqry(root[a], 1, n, ++at));
      root[a] = root[b];
      l[k2] = a, r[k2] = b;
      if ((++k2) - k == B)
        run(), k = 0;
    } else if ('Q' == type[0]) {
      scanf("%d", &b);
      puts(ppt(root[a], 1, n, b) ? "yes" : "no");
    } else {
      int z = dp[a];
      for (int j = k; j < k2; ++j) {
        int x[2] = { l[j], r[j] };
        for (int u = 0; u < 2; ++u)
          if (counted[x[u]] != i && find(x[u]) != find(a) &&
              ppt(root[x[u]], 1, n, a))
            ++z, counted[x[u]] = i;
      }
      printf("%d\n", z);
    }
  }
}

Compilation message (stderr)

servers.c: In function 'main':
servers.c:55:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |   scanf("%d%d", &n, &q);
      |   ^~~~~~~~~~~~~~~~~~~~~
servers.c:65:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     scanf(" %s%d", type, &a);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
servers.c:67:7: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |       scanf("%d", &b);
      |       ^~~~~~~~~~~~~~~
servers.c:78:7: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |       scanf("%d", &b);
      |       ^~~~~~~~~~~~~~~

• Subtask 1: 2.5 / 2.5
• Subtask 2: 0 / 2.5
• Subtask 3: 2.5 / 2.5
• Subtask 4: 0 / 2.5
• Subtask 5: 5 / 5
• Subtask 6: 0 / 5
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 12.5 / 12.5
• Subtask 10: 0 / 12.5
• Subtask 11: 17.5 / 17.5
• Subtask 12: 0 / 17.5