Submission #585530

#	Time	Username	Problem	Language	Result	Execution time	Memory
585530		Tien_Noob	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	247 ms	14412 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;
long long sum[3];
map<int, int> comp;
int t[N + 1], cnt[2];
struct FenwickTree
{
    long long tree[N + 1];
    void add(int pos, int val)
    {
        for (; pos <= N; pos += (pos & -pos))
        {
            tree[pos] += val;
        }
    }
    long long sum(int pos)
    {
        long long ret = 0;
        for (; pos > 0; pos -= (pos & -pos))
        {
            ret += tree[pos];
        }
        return ret;
    }
    long long sum(int l, int r)
    {
        return sum(r) - sum(l - 1);
    }
} tree[4];
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> > point;
long long Get(int i, int sz)
{
    int low = 0, high = point.size();
    while(low <= high)
    {
        int mid = (low + high)/2;
        if (tree[i].sum(mid) >= sz)
        {
            high = mid - 1;
        }
        else
        {
            low = mid + 1;
        }
    }
    long long ret = t[low] * tree[i].sum(low - 1) - tree[i + 1].sum(low - 1) + tree[i + 1].sum(low + 1, N) - tree[i].sum(low + 1, N) * t[low];
    assert(ret >= 0);
    //cerr << t[low] << ' ' << ret << ' ';
    return ret;
}
void solve()
{
    if (pos.empty())
    {
        cout << add;
        return ;
    }
    if (k == 1)
    {
        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;
        return ;
    }
    int j = 0;
    for (auto &p : pos)
    {
        comp[p] = ++j;
        t[j] = p;
    }
    for (auto &p : L)
    {
        point.emplace_back(p.first, p.second);
        tree[2].add(comp[p.first], 1);
        tree[2].add(comp[p.second], 1);
        tree[3].add(comp[p.first], p.first);
        tree[3].add(comp[p.second], p.second);
    }
    sort(point.begin(), point.end(), [&](auto &x, auto &y)
         {
             return x.first + x.second < y.first + y.second;
         });
    for (int i = 0; i < point.size(); ++ i)
    {
        res = min(res, Get(0, i) + Get(2, point.size() - i));
        tree[2].add(comp[point[i].first], -1);
        tree[2].add(comp[point[i].second], -1);
        tree[3].add(comp[point[i].first], -point[i].first);
        tree[3].add(comp[point[i].second], -point[i].second);

        tree[0].add(comp[point[i].first], 1);
        tree[0].add(comp[point[i].second], 1);
        tree[1].add(comp[point[i].first], point[i].first);
        tree[1].add(comp[point[i].second], point[i].second);
        //cerr << '\n';
    }
    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 'void solve()':
bridge.cpp:135:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  135 |     for (int i = 0; i < point.size(); ++ i)
      |                     ~~^~~~~~~~~~~~~~
bridge.cpp: In function 'int main()':
bridge.cpp:157:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  157 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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