Submission #1012088

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012088		huutuan	Ski 2 (JOI24_ski2)	C++14	12 / 100	547 ms	467032 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define int long long

const int N=310, inf=1e18;
int n, z, f[N*2][N][N], c[N*2], cnt[N*2];
pair<int, int> a[N];
vector<int> vals;
int d[N*2];

int32_t main(){
   ios_base::sync_with_stdio(false);
   cin.tie(nullptr);
   cin >> n >> z;
   map<int, int> mp;
   for (int i=1; i<=n; ++i){
      cin >> a[i].first >> a[i].second;
      ++a[i].first;
      ++mp[a[i].first];
   }
   {
      int open=1, cur=0;
      for (auto &i:mp){
         cur=max(0ll, cur+i.second-open);
         vals.push_back(i.first);
         int _open=open, _cur=cur, pos=i.first;
         while (cur){
            ++pos;
            cur=max(0ll, cur-open);
            vals.push_back(pos);
         }
         open=_open, cur=_cur;
      }
   }
   vals.push_back(0);
   sort(vals.begin(), vals.end()); vals.resize(unique(vals.begin(), vals.end())-vals.begin());
   for (int i=1; i<=n; ++i) a[i].first=lower_bound(vals.begin(), vals.end(), a[i].first)-vals.begin(), ++cnt[a[i].first];
   for (int i=0; i<(int)vals.size()-1; ++i) d[i]=vals[i+1]-vals[i];
   for (int i=0; i<N*2; ++i) c[i]=inf;
   for (int i=1; i<=n; ++i) c[a[i].first+1]=min(c[a[i].first+1], a[i].second);
   for (int i=1; i<N*2; ++i) c[i]=min(c[i], c[i-1]);
   for (int i=0; i<N*2; ++i) for (int j=0; j<N; ++j) for (int k=0; k<N; ++k) f[i][j][k]=inf;
   f[0][1][0]=0;
   for (int i=0; i<N*2-1; ++i) for (int j=0; j<=n; ++j) for (int k=0; k<=n; ++k) if (f[i][j][k]!=inf){
      for (int x=min(cnt[i+1]+k, j); x<=cnt[i+1]+k; ++x){
         if (c[i+1]==inf && x-j>0) continue;
         f[i+1][max(j, x)][k+cnt[i+1]-x]=min(f[i+1][max(j, x)][k+cnt[i+1]-x], f[i][j][k]+max(0ll, x-j)*c[i+1]+(k+cnt[i+1]-x)*z*d[i]);
      }
   }
   int ans=inf;
   for (int i=0; i<=n; ++i) ans=min(ans, f[(int)vals.size()-1][i][0]);
   cout << ans << '\n';
   return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 12 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 33
• Subtask 5: 0 / 27
• Subtask 6: 0 / 14