Submission #493328

#	Time	Username	Problem	Language	Result	Execution time	Memory
493328		ntabc05101	Mostovi (COI14_mostovi)	C++14	100 / 100	186 ms	14332 KiB

mostovi

#include<bits/stdc++.h>
using namespace std;

int n, m;
set<int> bl;
set< array<int, 2> > sx, sy;

array<int, 2> getR(int x, int y) {
  auto it = sx.lower_bound({x, -1});
  if (it != sx.end() && (*it)[1] >= y) {
    return *it;
  }
  it = sy.lower_bound({y, -1});
  if (it != sy.end() && (*it)[1] >= x) {
    return {(*it)[1], (*it)[0]};
  }
  return {-1, -1};
}

array<int, 2> getL(int x, int y) {
  auto it = sx.lower_bound({x + 1, -1});
  if (it != sx.begin()) {
    it--;
    if ((*it)[1] <= y) {
      return *it;
    }
  }
  it = sy.lower_bound({y + 1, -1});
  if (it != sy.begin()) {
    it--;
    if ((*it)[1] <= x) {
      return {(*it)[1], (*it)[0]};
    }
  }
  return {-1, -1};
}

bool chk(int x, int y) {
  if (!(~x) || !(~y)) {
    return false;
  }
  if (x == y) {
    return true;
  }

  if (x < n && y < n) {
    if (x < y) {
      auto it = bl.lower_bound(x);
      return it == bl.end() || *it >= y;
    }
    else {
      auto m = getR(x, -1);
      return (chk(x, m[0]) && chk(m[1], y));
    }
  }

  if (x >= n && y >= n) {
    if (x > y) {
      auto it = bl.lower_bound(y);
      return it == bl.end() || *it >= x;
    }
    else {
      auto m = getL(n, x);
      return chk(x, m[1]) && chk(m[0], y);
    }
  }

  if (x < n) {
    auto m = getR(x, y);
    return chk(x, m[0]) && chk(m[1], y);
  }
  else {
    auto m = getL(y, x);
    return chk(x, m[1]) && chk(m[0], y);
  }
  return false;
}

int main() {
	cin.tie(0)->sync_with_stdio(0);

  cin >> n >> m;
  for (int i = 0; i < m; i++) {
    char type; int x, y; cin >> type >> x >> y;
    x--; y--;

    if (type == 'Q') {
      cout << (chk(x, y) ? "DA": "NE") << "\n";
    }
    else {
      if (x > y) {
        swap(x, y);
      }
      if (type == 'A') {
        sx.insert({x, y}); sy.insert({y, x});
      }
      else {
        bl.insert(x);
      }
    }
  }

	return 0;
}

• Subtask 1: 100 / 100