Submission #585473

#	Time	Username	Problem	Language	Result	Execution time	Memory
585473		tamthegod	Palembang Bridges (APIO15_bridge)	C++14	0 / 100	2 ms	468 KiB

bridge

#include<bits/stdc++.h>

#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int k, n;
int res = 0;
int m = 0;
vector<int> vc;
map<int, int> mp;
struct TCitizen
{
    char p;
    int s;
    char q;
    int t;
} a[maxN];
void ReadInput()
{
    cin >> k >> n;
    for(int i=1; i<=n; i++)
    {
        char p, q;
        int s, t;
        cin >> p >> s >> q >> t;
        vc.pb((s + t) / 2);
        if(p == q)
        {
            res += abs(s - t);
            continue;
        }
        if(s > t)
            swap(s, t);
        a[++m] = {p, s, q, t};
    }
}
void Solve()
{
    assert(k == 1);
    if(!m)
    {
        cout << res;
        return;
    }
    int _min = oo;
    sort(vc.begin(), vc.end());
    vc.erase(unique(vc.begin(), vc.end()), vc.end());
    sort(a + 1, a + m + 1, [](TCitizen p, TCitizen q)
    {
        return p.s < q.s;
    });
    int p = 1;
    int sum = 0;
    for(int x : vc)
    {
        while(p <= m && a[p].s <= x)
        {
            sum += a[p].s;
            p++;
        }
        mp[x] += x * (p - 1) - sum;
    }
    sort(a + 1, a + m + 1, [](TCitizen p, TCitizen q)
    {
        return p.t < q.t;
    });
    p = 1;
    sum = 0;
    for(int x : vc)
    {
        while(p <= m && a[p].t <= x)
        {
            sum += a[p].t;
            p++;
        }
        mp[x] += x * (p - 1) - sum;
    }
    reverse(vc.begin(), vc.end());
    sort(a + 1, a + m + 1, [](TCitizen p, TCitizen q)
    {
        return p.s > q.s;
    });
    p = 1;
    sum = 0;
    for(int x : vc)
    {
        while(p <= m && a[p].s >= x)
        {
            sum += a[p].s;
            p++;
        }
        mp[x] += -(x * (p - 1) - sum);
    }
    sort(a + 1, a + m + 1, [](TCitizen p, TCitizen q)
    {
        return p.t > q.t;
    });
    p = 1;
    sum = 0;
    for(int x : vc)
    {
        while(p <= m && a[p].t >= x)
        {
            sum += a[p].t;
            p++;
        }
        mp[x] += -(x * (p - 1) - sum);
    }
    for(pair<int, int> v : mp)
        _min = min(_min, v.se);
    _min += m;
    int _min1 = oo;
    for(int x : vc)
    {
        int val = 0;
        for(int i=1; i<=m; i++)
            val += abs(x - a[i].s) + abs(x - a[i].t) + 1;
        _min1 = min(_min1, val);
    }
    assert(_min <= _min1);
    cout << res + _min;
}
int32_t main()
{
  //  freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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