제출 #1061714

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1061714		mychecksedad	추월 (IOI23_overtaking)	C++17	0 / 100	2 ms	860 KiB

overtaking

#include "overtaking.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define ll long long
#define ff first
#define ss second
const int N = 3005;
const ll INF = 1e18;

set<pair<ll, ll>> pref[N];
vector<ll> T, W, S;
ll n, m, x, L;
void init(int Ll, int nn, std::vector<long long> t, std::vector<int> w, int xx, int mm, std::vector<int> s)
{ 
  L = Ll, n=nn, m=mm, x=xx;
  for(int i = 0; i < n; ++i){
    if(w[i] > x)
      W.pb(w[i]), T.pb(t[i]);
  }
  for(int f: s) S.pb(f);
  W.pb(x);
  S.pb(Ll);

  n = W.size();

  vector<pair<ll, int>> F;
  for(int i =0; i < n; ++i) F.pb({W[i], i});
  sort(all(F));
  reverse(all(F));
  vector<vector<ll>> dp(n + 1, vector<ll>(m + 2));

  for(int i = 0; i < n; ++i){
    dp[i][0] = T[F[i].ss];
    for(int j = 1; j <= m; ++j){
      ll mx = dp[i][j - 1] + F[i].ff * (S[j] - S[j-1]);
      
      auto pos = pref[j].lower_bound(pair<ll,ll>{dp[i][j - 1], -1});
      if(pos == pref[j].begin()){
        dp[i][j] = mx;
      }else{
        pos = prev(pos);
        dp[i][j] = max(mx, (*pos).ss);
      }
      pref[j].insert({dp[i][j - 1], dp[i][j]});
    }
  }

  return;
}

long long arrival_time(long long Y)
{
  ll cur = Y;
  for(int j = 1; j <= m; ++j){
    ll mx = cur + x * (S[j] - S[j-1]);
    auto pos = pref[j].lower_bound(pair<ll,ll>{cur, -1});
    if(pos == pref[j].begin()){
      cur = mx;
    }else{
      pos = prev(pos);
      cur = max(mx, (*pos).ss);
    }
  }
  return cur;
}

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