Submission #132724

#	Time	Username	Problem	Language	Result	Execution time	Memory
132724		Talant	The Big Prize (IOI17_prize)	C++17	0 / 100	30 ms	23804 KiB

prize

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

#define sc second
#define fr first
#define mk make_pair
#define pb push_back

using namespace std;

const int N = (1e6 + 5);
const int inf = (1e9 + 7);

vector <int> res[N];
int mx,cur;
int u[N];
vector <pair<int,int> > v;

int find_best(int n) {
      for (int i = min(n - 1,500); i >= 0; i --) {
            if (res[i].size() == 0)
            res[i] = ask(i);
            int s = res[i][0] + res[i][1];
            if (!s) return i;
            if (!u[s]) v.pb(mk(s,i)),u[s] = 1;
      }
      sort(v.rbegin(),v.rend());

      cur = v[0].sc;
      if (v.size() > 1)
            cur = min(cur,v[1].sc);

      while(1) {
            if (res[cur].size() == 0)
            res[cur] = ask(cur);
            if (res[cur][0] + res[cur][1] == 0) return cur;
            if (v.size() == 1) {
                  if (res[cur][0] + res[cur][1] != v[0].fr) {
                        cur ++;
                        continue;
                  }
            }
            else {
                  if (res[cur][0] + res[cur][1] != v[0].fr && res[cur][0] + res[cur][1] != v[1].fr) {
                        cur ++;
                        continue;
                  }
            }
            int lf = res[cur][0];
            int rt = res[cur][1];
            int l = cur,r = n - 1;
            while (r - l > 1) {
                  int m = (r + l) >> 1;
                  if (res[m].size() == 0)
                        res[m] = ask(m);
                  if (res[m][0] + res[m][1] == 0) return m;
                  if (res[m][0] >= lf && res[m][1] <= rt) l = m;
                  else r = m;
            }
            if (res[r].size() == 0)
            res[r] = ask(r);
            if (res[r][0] + res[r][1] == 0) return r;
            if (res[r][0] >= lf && res[r][1] <= rt) l = r;
            cur = l + 1;
      }
}

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