Submission #1239672

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239672		Timosh	자리 배치 (IOI18_seats)	C++20	0 / 100	285 ms	327680 KiB

seats

#include "bits/stdc++.h"
#include "seats.h"

using namespace std;

struct node
{
  int mx, mn;
};

struct segTree
{
  vector<node> t;
  void init(int N)
  {
    t.resize(4 * N);
  }
  node merge(node a, node b)
  {
    node c;
    c.mn = min(a.mn, b.mn);
    c.mx = max(a.mx, b.mx);
  }
  void upd(int pos, int x, int l, int r, int i = 1)
  {
    if (l == r)
      t[i].mn = t[i].mx = x;
    else
    {
      int m = (l + r) / 2;
      if (pos <= m)
        upd(pos, x, l, m, i * 2);
      else
        upd(pos, x, m + 1, r, i * 2 + 1);
      t[i] = merge(t[i * 2], t[i * 2 + 1]);
    }
  }
  node get(int l, int r, int tl, int tr, int i = 1)
  {
    if (l > tr || tl > r)
      return t[0];
    if (l <= tl && tr <= r)
      return t[i];
    int m = (tl + tr) / 2;
    return merge(get(l, r, tl, m, i * 2), get(l, r, m + 1, tr, i * 2 + 1));
  }
};
segTree x, y;
vector<pair<int, int>> X;
int n, m;

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C)
{
  x.init(H * W);
  y.init(H * W);
  for (int i = 0; i < H * W; i++)
    x.upd(i, R[i], 0, H * W - 1), y.upd(i, C[i], 0, H * W - 1);
}

int swap_seats(int a, int b)
{
  swap(X[a], X[b]);
  x.upd(a, X[a].first, 0, n * m - 1);
  y.upd(a, X[a].second, 0, n * m - 1);
  x.upd(b, X[b].first, 0, n * m - 1);
  y.upd(b, X[b].second, 0, n * m - 1);
  int ans = 0;
  int cur = 0;
  while (cur < n * m)
  {
    node h = x.get(0, cur, 0, n * m - 1);
    node w = y.get(0, cur, 0, n * m - 1);
    if (cur == (h.mx - h.mn) * (w.mx - w.mn))
      ans++;
    cur++;
  }
  cout << ans;
}

Compilation message (stderr)

seats.cpp: In member function 'node segTree::merge(node, node)':
seats.cpp:23:3: warning: no return statement in function returning non-void [-Wreturn-type]
   23 |   }
      |   ^
seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:78:1: warning: no return statement in function returning non-void [-Wreturn-type]
   78 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30