Submission #585500

#	Time	Username	Problem	Language	Result	Execution time	Memory
585500		Tien_Noob	Palembang Bridges (APIO15_bridge)	C++17	31 / 100	2096 ms	14388 KiB

bridge

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 1e5;
int k, n;
long long add, res = 1e18;
set<int> pos;
multiset<pair<int, int> > L, mid, R;
int cnt[2];
long long sum[3];
void read()
{
    cin >> k >> n;
    while(n--)
    {
        char P, Q;
        int s, t;
        cin >> P >> s >> Q >> t;
        if (P == Q)
        {
            add += abs(s - t);
            continue;
        }
        pos.insert(s);
        pos.insert(t);
        if (s > t)
        {
            swap(s, t);
        }
        L.insert({s, t});
        //R.insert({t, s});
        ++cnt[1];
        sum[1] += s + t;
        ++add;
    }
}
vector<pair<int, int> > trash;
long long Cal(int mid, int x)
{
    long long ret = 0;
    for (auto &p : trash)
    {
        ret += min(abs(p.first - mid) + abs(p.second - mid), abs(p.first - x) + abs(p.second - x));
    }
    return ret;
}
long long Get(int x)
{
    /*int low = 0, high = 1e9;
    while(low <= high)
    {
        int mid = (low + high)/2;
        if (Cal(mid) >= Cal(mid + 1))
        {
            low = mid + 1;
        }
        else
        {
            high = mid - 1;
        }
    }
    return min(Cal(low), Cal(high));*/
    long long ret = 1e18;
    for (int mid : pos)
    {
        ret = min(ret, Cal(mid, x));
    }
    return ret;
}
void solve()
{
    if (k == 1)
    {
        if (pos.empty())
        {
            cout << add;
            return ;
        }
        for (int x : pos)
        {
            while(!L.empty() && L.begin()->first <= x)
            {
                sum[2] += L.begin()->second - L.begin()->first;
                --cnt[1];
                sum[1] -= L.begin()->first + L.begin()->second;
                mid.insert({L.begin()->second, L.begin()->first});
                L.erase(L.begin());
            }
            while(!mid.empty() && mid.begin()->first <= x)
            {
                ++cnt[0];
                sum[0] += mid.begin()->first + mid.begin()->second;
                sum[2] -= mid.begin()->first - mid.begin()->second;
                mid.erase(mid.begin());
            }
            res = min(res, 2LL * x * cnt[0] - sum[0] + sum[1] - 2LL * cnt[1] * x + sum[2]);
        }
        cout << res + add;
    }
    else
    {
        if (pos.empty())
        {
            cout << add;
            return ;
        }
        for (int x : pos)
        {
            while(!L.empty() && L.begin()->first <= x)
            {
                sum[2] += L.begin()->second - L.begin()->first;
                --cnt[1];
                sum[1] -= L.begin()->first + L.begin()->second;
                mid.insert({L.begin()->second, L.begin()->first});
                L.erase(L.begin());
            }
            while(!mid.empty() && mid.begin()->first <= x)
            {
                ++cnt[0];
                sum[0] += mid.begin()->first + mid.begin()->second;
                sum[2] -= mid.begin()->first - mid.begin()->second;
                trash.push_back({mid.begin()->first, mid.begin()->second});
                mid.erase(mid.begin());
            }
            res = min(res, Get(x) + sum[1] - 2LL * cnt[1] * x + sum[2]);
        }
        cout << res + add;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case " << __ << ": ";
        read();
        solve();
    }
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:139:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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