Submission #282615

#	Time	Username	Problem	Language	Result	Execution time	Memory
282615		Nucleist	Jousting tournament (IOI12_tournament)	C++11	100 / 100	579 ms	103016 KiB

tournament

//Self-control leads to consistency.
#include <bits/stdc++.h> 
#include <ext/pb_ds/assoc_container.hpp> // Common file
#include <ext/pb_ds/tree_policy.hpp> // Including tree_order_statistics_node_update
using namespace __gnu_pbds;
using namespace std; 
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (ll)x.size()
#define ll int
#define INF 1000000000
#define MOD 1000000007
#define pb push_back
#define ve vector<ll>
#define dos pair<ll,ll>
#define vedos vector<dos>
#define rand mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
#define EPS 0.000001
struct greateri
{
    template<class T>
    bool operator()(T const &a, T const &b) const { return a > b; }
};
void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0); 
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str(),"w",stdout);
}
typedef tree<
pair<int,dos>,
null_type,
less<pair<int,dos>>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;
typedef tree<
dos,
null_type,
less<dos>,
rb_tree_tag,
tree_order_statistics_node_update>
kalo;
kalo X1;
ordered_set X;
int p[100001];
int seg[1000001];
int zap[1000001];
int sparse[1000001][101];
set<pair<dos,int>>ko,zo;
void update(int p,int l,int r,int index,int val){
  if(l==r && l==index){
    seg[p]=val;
    return;
  }
  ll med=(l+r)>>1;
  if(index<=med)
    update(p*2,l,med,index,val);
  else update(p*2+1,med+1,r,index,val);
  seg[p]=max(seg[p*2],seg[p*2+1]);
}
int query(int p,int l,int r,int l1,int r1){
  if(l>=l1 && r<=r1){
    return seg[p];
  }
  if(l>r || l>r1 || l1>r)return -INF;
  ll med=(l+r)>>1;
  return max(query(p*2,l,med,l1,r1),query(p*2+1,med+1,r,l1,r1));
}
int GetBestPosition(int N, int C, int R, int *K, int *S, int *E) {
  flash;
  vedos prep;
  for (int i = 0; i < N; ++i)
  {
    X1.insert({i,i});
  }
  for (int i = 0; i < C; ++i)
  {
    ll l=S[i],r=E[i];
    ll yo,zo;
    auto n=X1.find_by_order(l);
    yo=(*n).first;
    auto m=X1.find_by_order(r);
    zo=(*m).second;
    for (int j = r; j >= l; --j)
    {
      auto u=X1.find_by_order(j);
      X1.erase(u);
    }
    X1.insert({yo,zo});
    prep.pb({yo,zo});
  }
  int ini=0;
  for(auto it:prep){
    ko.insert({{it.first,it.second},ini});
    zo.insert({{it.second,it.first},ini});
    ini++;
  }
  for (int i = 0; i < N-1; ++i)
  {
    update(1,0,N*2-1,i*2,K[i]);
    update(1,0,N*2-1,i*2+1,-INF);
  }
  ll yoz=log2(N*2)+1;
  zap[1] = 0;
  for (int i = 2; i <= N*2; i++)
  {
    zap[i] = zap[i/2] + 1;
  }
  for (int i = 0; i < N-1; i++)
  {
    sparse[i*2][0]=K[i];
    sparse[i*2+1][0]=-INF;
  }
  for (int j = 1; j <= yoz; j++)
    for (int i = 0; i + (1 << j) <= N*2; i++)
      {
        sparse[i][j] = max(sparse[i][j-1], sparse[i + (1 << (j - 1))][j - 1]);
        //debugs(i,j)
        //debug(sparse[i][j])
      }
  int j = zap[7 - 0 + 1];
  int minimum = max(sparse[0][j], sparse[7 - (1 << j) + 1][j]);
  //debugs(minimum,j)
  ve cur;
  dos best={-INF,0};
  int index=0;
  for(auto it:prep){
    if(0>=it.first && 0<=it.second){
      cur.pb(index);
      auto f=ko.lower_bound({{it.first,it.second},-INF});
      X.insert({(*f).second,(*f).first});
    }
    index++;
  }
  int l=0,r=sz(cur)-1;
  ll ans=-1;
  while(l<=r){
    ll med=(l+r)>>1;
    auto u=prep[cur[med]];
    auto zel=0;
    if(u.first==0){
      zel=max(query(1,0,N*2-1,u.first*2,(u.second)*2-1),R);
    }
    if(zel==R){
      ans=med+1;
      l=med+1;
    }
    else r=med-1;
  }
  if(ans==-1)ans=0;
  if(best.first<ans)
    best=max(best,{ans,0});

  for (int i = 1; i < N; ++i)
  {
    //debug(i)
    auto v=ko.lower_bound({{i,-INF},-INF});
    while(v!=ko.end() && (*v).first.first==i){
      X.insert({(*v).second,(*v).first});
      v++;
    }

    l=0,r=sz(X)-1;
    ans=-1;

    while(l<=r){
      ll med=(l+r)>>1;
      auto lo=X.find_by_order(med);
      auto u=(*lo).second;
      auto zel=0;
      if(i>u.first && i<=u.second){
        int L=u.first*2,RO=(u.second)*2-1;
        int j = zap[RO - L + 1];
        int minimum = max(sparse[L][j], sparse[RO - (1 << j) + 1][j]);
        //debugs(L,RO)
        //debugs(minimum,R)
        zel=max(minimum,R);
      }
      else if(i==u.first){
        int L=(u.first-1)*2+1,RO=(u.second)*2-1;
        int j = zap[RO - L + 1];
        int minimum = max(sparse[L][j], sparse[RO - (1 << j) + 1][j]);
        zel=max(minimum,R);
      }
      if(zel==R){
        ans=med+1;
        l=med+1;
      }
      else r=med-1;
    }

    if(ans==-1)ans=0;
    if(best.first<ans)
      best=max(best,{ans,i});

    auto l=zo.lower_bound({{i,-INF},-INF});
    while(l!=zo.end() && (*l).first.first==i){
      X.erase({(*l).second,{(*l).first.second,(*l).first.first}});
      l++;
    }
  }
  return best.second;
}

Compilation message (stderr)

tournament.cpp:8: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    8 | #pragma GCC optimization ("O3")
      | 
tournament.cpp:9: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    9 | #pragma GCC optimization ("unroll-loops")
      | 
tournament.cpp: In function 'int GetBestPosition(int, int, int, int*, int*, int*)':
tournament.cpp:127:7: warning: unused variable 'minimum' [-Wunused-variable]
  127 |   int minimum = max(sparse[0][j], sparse[7 - (1 << j) + 1][j]);
      |       ^~~~~~~
tournament.cpp: In function 'void setIO(std::string)':
tournament.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   31 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tournament.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   32 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 51 / 51