Submission #640688

#	Time	Username	Problem	Language	Result	Execution time	Memory
640688		makanhulia	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	1 ms	340 KiB

bridge

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
typedef long long ll;
// const ll mod = 1e9 + 7;
const ll MAXN = 1e6 + 5;
#define vi vector<int>
#define vll vector<ll>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define mp make_pair
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define fi first
#define sc second
#define endl '\n'
#define gl                        ios_base::sync_with_stdio(0);   cin.tie(0);                     cout.tie(0)

int main()
{
  gl;
  ll k, n;
  cin >> k >> n;

  ll sum = 0;

  vll v;

  for (int i = 0; i < n; i++)
  {
    char a, b;
    ll x, y;
    cin >> a >> x >> b >> y;
    if (a == b)
      sum += abs(x - y);
    else
    {
      sum++;
      v.pb(x);
      v.pb(y);
    }
  }

  sort(v.begin(), v.end());

  vll ps(v.size(), 0);
  ll ans = 1e18;

  for (int i = 0; i < v.size(); i++)
  {
    ps[i] = v[i];
    if (i > 0)
      ps[i] += ps[i - 1];
  }

  ll l = v[0], r = v[v.size() - 1];
  while (l <= r)
  {
    ll m = (l + r) / 2;
    ll pos = ub(v.begin(), v.end(), m) - v.begin();
    if (pos > 0)
      pos--;

    ans = min(ans, (ll)(m * (pos + 1) - ps[pos] - m * (v.size() - pos - 1) + ps[v.size() - 1] - ps[pos]));

    if (m * (pos + 1) - ps[pos] <= m * (v.size() - pos - 1) - ps[v.size() - 1] + ps[pos])
    {
      l = m + 1;
    }
    else
    {
      r = m - 1;
    }
  }

  if (ans == 1e18)
    ans = 0;

  cout << ans + sum << endl;

  return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:50:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |   for (int i = 0; i < v.size(); i++)
      |                   ~~^~~~~~~~~~
bridge.cpp:67:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'long long unsigned int' [-Wsign-compare]
   67 |     if (m * (pos + 1) - ps[pos] <= m * (v.size() - pos - 1) - ps[v.size() - 1] + ps[pos])

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