Submission #52717

#	Time	Username	Problem	Language	Result	Execution time	Memory
52717		KieranHorgan	The Big Prize (IOI17_prize)	C++17	0 / 100	47 ms	5072 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> res[200000];
set<int> nextPos, curPos;
vector<int> positions;
int smaller, nextSmaller;
int flag=-1;

void get(int i) {
  if(res[i][0] != -1 && res[i][1] != -1) return;
  res[i] = ask(i);
  if(res[i][0]+res[i][1]==0) flag=i;
}

void dac(int lo, int hi) {
//  cerr << lo << " " << hi << endl;
  if(lo == hi) return;
  get(positions[lo]);
  if(flag!=-1) {return;}
  get(positions[hi]);
  if(flag!=-1) {return;}
  if(res[positions[lo]][0]==res[positions[hi]][0] &&
     res[positions[lo]][1]==res[positions[hi]][1]) return;
  if(res[positions[lo]][1]-res[positions[hi]][1]==hi-lo-1) {
    for(int i = lo+1; i <= hi-1; i++) {
      nextPos.insert(positions[i]);
      get(positions[i]);
      if(flag!=-1) {return;}
      nextSmaller = max(nextSmaller, res[positions[i]][0]+res[positions[i]][1]);
    }
    return;
  }
  int mid = (hi+lo)/2;
  get(positions[mid]);
  if(flag!=-1) {return;}
  if(res[positions[mid]][0]+res[positions[mid]][1] == smaller) {
    dac(lo, mid);
    dac(mid, hi);
    return;
  }

  int m1 = mid;
  while(m1 != lo && res[positions[m1]][0]+res[positions[m1]][1] != smaller) {
    nextPos.insert(m1);
    nextSmaller = max(nextSmaller, res[positions[m1]][0]+res[positions[m1]][1]);
    m1--;
    get(positions[m1]);
  if(flag!=-1) {return;}}

  dac(lo, m1);

  int m2 = mid;
  while(m2 != hi && res[positions[m2]][0]+res[positions[m2]][1] != smaller) {
    nextPos.insert(m2);
    nextSmaller = max(nextSmaller, res[positions[m2]][0]+res[positions[m2]][1]);
    m2++;
    get(positions[m2]);
  if(flag!=-1) {return;}}

  dac(m2, hi);

  return;
}

int find_best(int n) {
  for(int i = 0; i < n; i++) {
    vector<int> res = ask(i);
    if(res[0] + res[1] == 0)
      return i;
  }
  return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 80