Submission #653446

#	Time	Username	Problem	Language	Result	Execution time	Memory
653446		ayalla	Palembang Bridges (APIO15_bridge)	C++14	63 / 100	2071 ms	29304 KiB

bridge

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

template <class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define int long long int
#define endl '\n'
#define pb push_back
#define pi pair<int, int>
#define pii pair<int, pi>
#define fir first
#define sec second
#define MAXN 200005
#define mod 998244353

int calc(vector<int> &v, int x)
{
  int ans = 0;
  for (auto const &i : v)
    ans += abs(i - x);
  return ans;
}
int solve(vector<int> &v)
{
  ordered_set<pi> s;
  map<int, int> mp;
  for (auto const &i : v)
  {
    s.insert({i, mp[i]});
    mp[i]++;
  }
  int sz = v.size();
  int x = (*s.find_by_order(sz / 2)).fir;
  int ans = calc(v, x);
  if (v.size() > 1)
  {
    int x = (*s.find_by_order((sz / 2) - 1)).fir;
    ans = min(ans, calc(v, x));
  }
  return ans;
}
void solve1(int n, int k)
{
  int ans = 0;
  vector<int> pts;
  for (int i = 0; i < n; i++)
  {
    char c1, c2;
    int a, b;
    cin >> c1 >> a >> c2 >> b;
    if (c1 == c2)
    {
      ans += abs(a - b);
    }
    else
    {
      ans++;
      pts.pb(a);
      pts.pb(b);
    }
  }
  if (!pts.size())
  {
    cout << ans << endl;
    return;
  }
  sort(pts.begin(), pts.end());
  ans += solve(pts);
  cout << ans << endl;
}
void solve2(int n, int k)
{
  vector<pi> aux;
  vector<pi> v;
  int ans = 0;
  for (int i = 0; i < n; i++)
  {
    char c1, c2;
    int a, b;
    cin >> c1 >> a >> c2 >> b;
    v.pb({a, b});
    if (c1 == c2)
    {
      ans += abs(a - b);
    }
    else
    {
      ans++;
      aux.pb({a + b, i});
    }
  }
  if (!aux.size())
  {
    cout << ans << endl;
    return;
  }
  sort(aux.begin(), aux.end());
  vector<int> pts;
  for (auto const &i : aux)
  {
    pts.pb(v[i.sec].fir);
    pts.pb(v[i.sec].sec);
  }
  int need = ans;
  vector<int> pts2;
  ans += solve(pts);
  while (pts.size() > 2)
  {
    pts2.pb(pts.back());
    pts.pop_back();
    pts2.pb(pts.back());
    pts.pop_back();
    int curr = need + solve(pts) + solve(pts2);
    ans = min(ans, curr);
  }
  cout << ans << endl;
}
signed main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n, k;
  cin >> k >> n;
  if (k == 1)
    solve1(n, k);
  else
    solve2(n, k);
  return 0;
}

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