Submission #894993

#	Time	Username	Problem	Language	Result	Execution time	Memory
894993		d4xn	Wish (LMIO19_noras)	C++17	0 / 100	1 ms	6492 KiB

noras

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

#define int long long

const int N = 1e6+6;

int n, R, a[N], b[N], c[N], d[N];
map<int, int> f;

signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> n >> R;
  for (int i = 0; i < n; i++) {
    cin >> a[i] >> b[i] >> c[i] >> d[i];

    int x = c[i]-a[i];
    int y = d[i]-b[i];
  
    int l = 0;
    int r = 1e9;
    while (l < r) {
      int mid = (l+r)/2;

      bool in1 = (abs(a[i] + x*mid) + abs(b[i] + y*mid)) <= R;
      bool in2 = (abs(a[i] + x*(mid+1)) + abs(b[i] + y*(mid+1))) <= R;

      if (in1 && in2) r = mid;
      else {
        if (abs(a[i] + x*mid) + abs(b[i] + y*mid) <= 
        abs(a[i] + x*(mid+1)) + abs(b[i] + y*(mid+1))) {
          r = mid;
        }
        else {
          l = mid+1;
        }
      }
    }
    int fst = l;

    l = 0;
    r = 1e9;
    while (l < r) {
      int mid = (l+r)/2;
      
      bool in1 = (abs(a[i] + x*mid) + abs(b[i] + y*mid)) <= R;
      bool in2 = (abs(a[i] + x*(mid+1)) + abs(b[i] + y*(mid+1))) <= R;

      if (in1 && in2) l = mid+1;
      else {
        if (abs(a[i] + x*mid) + abs(b[i] + y*mid) < 
        abs(a[i] + x*(mid+1)) + abs(b[i] + y*(mid+1))) {
          r = mid;
        }
        else {
          l = mid+1;
        }
      }
    }
    int lst = l;

    bool in1 = (abs(a[i] + x*fst) + abs(b[i] + y*fst)) <= R;
    bool in2 = (abs(a[i] + x*lst) + abs(b[i] + y*lst)) <= R;
    assert(in1 == in2);
    if (!in1) continue;
    f[fst]++;
    f[lst+1]--;
  }

  int ans = 0;
  int sum = 0;
  for (auto& [x, y] : f) {
    sum += y;
    ans = max(ans, sum);
  }
  cout << ans << "\n";
}

• Subtask 1: 0 / 23
• Subtask 2: 0 / 23
• Subtask 3: 0 / 15
• Subtask 4: 0 / 32
• Subtask 5: 0 / 7