Submission #1241177

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241177		MarwenElarbi	Sphinx's Riddle (IOI24_sphinx)	C++20	36 / 100	34 ms	436 KiB

sphinx

#include <bits/stdc++.h>
#include "sphinx.h"
using namespace std;
#define fi first
#define se second
#define pb push_back
const int nax = 5e5+5;


vector<int> mark(int N,int color,int l,int r){
  vector<int> ans(N,color);
  for (int i = l; i <= r; ++i)
  {
    if((i-l)%2) ans[i]=color;
    else ans[i]=-1;
  }
  return ans;
}

std::vector<int> find_colours(int N, std::vector<int> X, std::vector<int> Y) {
  vector<int> p, imp;
  for (int i = 0; i < N; ++i) (i%2 ? imp : p).push_back(i);
  vector<int> ans(N);
  for (int i = 0; i < N; ++i)
  {
    int lst=-1;
    while(true){
      if(lst>p.back()) break;
      int cur = lower_bound(p.begin(),p.end(),lst)-p.begin();
      int x = perform_experiment(mark(N,i,p[cur],N-1));
      if(x-(p[cur]>0)==N-1-p[cur]+1) break;
      int r=p.size();
      int l=cur-1;
      while(r-l>1){
        int mid=(r+l)/2;
        if(perform_experiment(mark(N,i,p[cur],p[mid]))-(p[cur]>0)-(p[mid]<N-1)==p[mid]-p[cur]+1) l=mid;
        else r=mid;
      }
      ans[p[r]]=i;
      lst=p[r]+1;
    }
  }
  for (int i = 0; i < N; ++i)
  {
    int lst=-1;
    while(true){
      if(lst>imp.back()) break;
      int cur = lower_bound(imp.begin(),imp.end(),lst)-imp.begin();
      int x = perform_experiment(mark(N,i,imp[cur],N-1));

      if(x-1==N-1-imp[cur]+1) break;
      int r=imp.size();
      int l=cur-1;
      while(r-l>1){
        int mid=(r+l)/2;
        if(perform_experiment(mark(N,i,imp[cur],imp[mid]))-1-(imp[mid]<N-1)==imp[mid]-imp[cur]+1) l=mid;
        else r=mid;
      }
      ans[imp[r]]=i;
      lst=imp[r]+1;
    }
  }
  return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 3 / 3
• Subtask 2: 0 / 7
• Subtask 3: 33 / 33
• Subtask 4: 0 / 21
• Subtask 5: 0 / 36