Submission #586484

#	Time	Username	Problem	Language	Result	Execution time	Memory
586484		wdjpng	Meetings (IOI18_meetings)	C++17	17 / 100	170 ms	154024 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>


#define int long long
#define all(a) a.begin(), a.end()
#define rep(i,n) for(int i = 0; i<n; i++)

using namespace std;

struct s
{
  int m=0,l=0,r=0, ar=0;
};

s unite(s s1, s s2)
{
  s res;
  res.ar=s1.ar+s2.ar;
  res.m=max({s1.m,s2.m,s1.r+s2.l});

  res.l=s1.l;
  res.r=s2.r;
  if(s1.l==s1.ar) res.l+=s2.l;
  if(s2.r==s2.ar) res.r+=s1.r;
  return res;
}

s def=s();
int N = 100000;
vector<s>T(4*N);

s update(int i, int l, int r, int ui, int uv)
{
  if(l>ui||r<=ui) return T[i];
  if(l+1==r) return T[i]=s({uv,uv,uv,1});
  return T[i] = unite(update(2*i,l,(l+r)/2,ui,uv), update(2*i+1,(l+r)/2,r,ui,uv));
}

s query(int i, int l, int r, int ql, int qr)
{
  if(l>=qr||r<=ql) return def;
  if(l>=ql&&r<=qr) return T[i];
  return unite(query(2*i,l,(l+r)/2,ql,qr),query(2*i+1,(l+r)/2,r,ql,qr));
}

vector<int> minimum_costs(vector<signed> H,vector<signed> L,
                                    vector<signed> R) {
  int n = H.size();
  if(n>5000)
  {
     rep(i,n) update(1,0,n,i,H[i]==1);
    vector<int>C(L.size());
    rep(cq, L.size()) C[cq]=2*(R[cq] - L[cq] + 1) - query(1,0,n,L[cq], R[cq]+1).m;
    return C;
  } else
  {
    vector<vector<int>>lef(n, vector<int>(n)), ri(n, vector<int>(n));
    rep(i,n)
    {
      int sum=0;
      vector<int>v, occ;
      for(int j = i; j < n; j++)
      {
        sum+=H[j];
        int c = 1;
        while (v.size()&&v[v.size()-1]<H[j])
        {
          sum+=H[j]-v[v.size()-1];
          c+=occ[occ.size()-1];
          v.pop_back();
          occ.pop_back();
        }
        if(v.size()&&v[v.size()-1]==H[j]) occ[occ.size()-1]+=c;
        else {v.push_back(H[j]); occ.push_back(c);}
        lef[i][j]=sum;
      }
    } 
    for(int i = n-1; i >= 0; i--)
      {
        int sum=0;
        vector<int>v, occ;
        for(int j = i; j >= 0; j--)
        {
          sum+=H[j];
          int c = 1;
          while (v.size()&&v[v.size()-1]<H[j])
          {
            sum+=H[j]-v[v.size()-1];
            c+=occ[occ.size()-1];
            v.pop_back();
            occ.pop_back();
          }
          if(v.size()&&v[v.size()-1]==H[j]) occ[occ.size()-1]+=c;
          else {v.push_back(H[j]); occ.push_back(c);}
          ri[i][j]=sum;
        }
      }
      vector<int>c(L.size());
      rep(i,L.size())
      {
        int minn=1e18;
        for(int j = L[i]; j <= R[i]; j++) {
          minn=min(minn, lef[L[i]][j]+ri[R[i]][j]-H[j]);
        }
        c[i]=minn;
      } 
      return c;
  }
}

Compilation message (stderr)

meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:7:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define rep(i,n) for(int i = 0; i<n; i++)
......
   54 |     rep(cq, L.size()) C[cq]=2*(R[cq] - L[cq] + 1) - query(1,0,n,L[cq], R[cq]+1).m;
      |         ~~~~~~~~~~~~              
meetings.cpp:54:5: note: in expansion of macro 'rep'
   54 |     rep(cq, L.size()) C[cq]=2*(R[cq] - L[cq] + 1) - query(1,0,n,L[cq], R[cq]+1).m;
      |     ^~~
meetings.cpp:7:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define rep(i,n) for(int i = 0; i<n; i++)
......
  100 |       rep(i,L.size())
      |           ~~~~~~~~~~              
meetings.cpp:100:7: note: in expansion of macro 'rep'
  100 |       rep(i,L.size())
      |       ^~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 17 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40