Submission #385314

#	Time	Username	Problem	Language	Result	Execution time	Memory
385314		mohamedsobhi777	Tram (CEOI13_tram)	C++14	0 / 100	1079 ms	1260 KiB

tram

#include <bits/stdc++.h>

using namespace std;

#define vi vector<int>
#define vll vector<ll>
#define vii vector<pair<int, int>>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define loop(_) for (int __ = 0; __ < (_); ++__)
#define pb push_back
#define f first
#define s second
#define sz(_) ((int)_.size())
#define all(_) _.begin(), _.end()
#define lb lower_bound
#define ub upper_bound

using ll = long long;
using ld = long double;

const int N = 1e5 + 7;
const ll mod = 1e9 + 7;

int n, m;
int vis[N][2];
int xs[N], ys[N];
multiset<int> mul;

struct cmp
{
       bool operator()(pii x, pii y)
       {
              return x.s - x.f != y.s - y.f ? x.s - x.f > y.s - y.f : x.f < y.f;
       }
};

set<pii, cmp> st;
set<pii> rst;

int calc(int x, int y)
{
       int ret = 1e9;
       if (mul.empty())
              return ret;
       auto eval = [&](int u) -> void {
              for (int i = 0; i < 2; ++i)
              {
                     if (vis[u][i])
                     {
                            ret = min(ret, (u - x) * (u - x) + (i - y) * (i - y));
                     }
              }
       };
       auto it = mul.lb(x);
       if (it != mul.end())
              eval(*it);
       if (it != mul.begin())
              eval(*(--it));
       return ret;
}

void Insert(int x, int y)
{
       st.insert({x, y});
       rst.insert({x, y});
}

void Erase(int x, int y)
{
       st.erase({x, y});
       rst.erase({x, y});
}

int main()
{
       ios_base::sync_with_stdio(0);
       cin.tie(0);
#ifndef ONLINE_JUDGE
#endif
       cin >> n >> m;
       Insert(0, n - 1);
       for (int i = 0; i < m; ++i)
       {
              char c;
              cin >> c;
              if (c == 'E')
              {
                     int Min = 0;
                     int wx = 0, wy = 0;
                     if (sz(mul) >= 2 && sz(rst))
                     {
                            for (auto u : st)
                            {
                                   int x = u.f, y = u.s;
                                   int mid = (x + y) >> 1;
                                   for (int i = 0; i < 2; ++i)
                                   {
                                          int w = calc(mid, i);
                                          if (w > Min)
                                          {
                                                 Min = w;
                                                 wx = mid, wy = i;
                                          }
                                   }
                                   // cout << x << "+" << y << "*\n";
                            }
                            // exit(0);
                     }
                     else if (!sz(rst))
                     {
                            wx = sz(mul) - n;
                            wy = calc(wx, 1) > calc(wx, 0);
                     }
                     else if (sz(mul) == 1)
                            wx = n - 1, wy = 1;

                     xs[i] = wx, ys[i] = wy;
                     vis[wx][wy] = 1;

                     for (auto u : st)
                     {
                            if (wx >= u.f && wx <= u.s)
                            {
                                   int x = u.f, y = u.s;
                                   Erase(x, y);
                                   if (x <= wx - 1)
                                          Insert(x, wx - 1);
                                   if (wx + 1 <= y)
                                          Insert(wx + 1, y);
                                   break;
                            }
                     }

                     mul.insert(wx);
                     cout << ++wx << " " << ++wy << "\n";
              }
              else
              {
                     int p;
                     cin >> p;
                     --p;
                     mul.erase(mul.find(xs[p]));
                     vis[xs[p]][ys[p]] = 0;
                     if (vis[xs[p]][0] == vis[xs[p]][1])
                     {
                            // for(auto u : rst)cout << u.f <<" " << u.s <<"++\n" ;

                            auto it = rst.lb({xs[p], -1});
                            int nxt = (it != rst.end() ? (*it).s : n - 1);
                            if (it != rst.end())
                            {
                                   Erase((*it).f, (*it).s);
                            }
                            // cout <<"Erase " << xs[p] <<" " << ys[p] <<" now \n" ;

                            --it;
                            int prv = (*it).f;
                            // cout << prv <<"    " << nxt <<"#\n";
                            Erase((*it).f, (*it).s);
                            Insert(prv, nxt);
                            // for(auto u : rst)cout << u.f <<" " << u.s <<"()\n" ;
                            // exit(0) ;
                     }
              }
       }
       return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 15
• Subtask 8: 0 / 20