Submission #989545

#	Time	Username	Problem	Language	Result	Execution time	Memory
989545		aykhn	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	32 ms	10700 KiB

bridge

#include <bits/stdc++.h>
 
using namespace std;
 
#define int long long
#define inf 0x3F3F3F3F3F3F3F3F
 
signed main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int k, n, S = 0;
  cin >> k >> n;
  vector<int> id, p, s, bp, bs;
  for (int i = 0; i < n; i++)
  {
    char a, b;
    int l, r;
    cin >> a >> l >> b >> r;
    if (l > r) swap(l, r);
    if (a == b) S += r - l;
    else id.push_back(l), id.push_back(r);
  }
  n = id.size();
  if (n <= k)
  {
    cout << S << '\n';
    return 0;
  }
  sort(id.begin(), id.end());
  p = s = id;
  for (int i = 1; i < n; i++) p[i] += p[i - 1];
  for (int i = n - 2; i >= 0; i--) s[i] += s[i + 1];
  bp.assign(n, 0), bs.assign(n, 0);
  int res = inf;
  for (int i = 0; i < n; i++)
  {
    res = min(res, s[i + 1] - p[i] + id[i] * (n - 2 * (n - i - 1)));
  }
  cout << res + S + n / 2 << '\n';
}

// bp[i] = s[i + 1] - p[i] + id[i] * (2 * (i + 1) - x)
// bs[i] = s[i + 1] - p[i] + id[i] * (x - 2 * (n - i - 1))

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37