Submission #989535

#	Time	Username	Problem	Language	Result	Execution time	Memory
989535		aykhn	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	31 ms	7480 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;
  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);
  }
  if (id.empty())
  {
    cout << S << '\n';
    return 0;
  }
  sort(id.begin(), id.end());
  p = s = id;
  for (int i = 1; i < p.size(); i++) p[i] += p[i - 1];
  for (int i = (int)s.size() - 2; i >= 0; i--) s[i] += s[i + 1];
  int res = inf;
  for (int i = 0; i < id.size(); i++)
  {
    int sum = 0;
    sum += id[i] * (i + 1) - p[i];
    if (0 <= i + 1 && i + 1 < s.size()) sum += s[i + 1] - id[i] * ((int)s.size() - (i + 1));
    res = min(res, sum);
  }
  cout << res + S + (int)id.size() / 2 << '\n';
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:31:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   for (int i = 1; i < p.size(); i++) p[i] += p[i - 1];
      |                   ~~^~~~~~~~~~
bridge.cpp:34:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for (int i = 0; i < id.size(); i++)
      |                   ~~^~~~~~~~~~~
bridge.cpp:38:29: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     if (0 <= i + 1 && i + 1 < s.size()) sum += s[i + 1] - id[i] * ((int)s.size() - (i + 1));
      |                       ~~~~~~^~~~~~~~~~

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