Submission #132746

#	Time	Username	Problem	Language	Result	Execution time	Memory
132746		Talant	The Big Prize (IOI17_prize)	C++17	92.52 / 100	99 ms	24080 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 find_best(int n) {
    for (int i = 0; i < min(n,500); i ++) {
          if (res[i].size() == 0)
          res[i] = ask(i);
          int s = res[i][0] + res[i][1];
          if (!s) return i;
          if (s >= mx) mx = s,cur = i;
    }
    while(1) {
          if (res[cur].size() == 0)
          res[cur] = ask(cur);
          if (res[cur][0] + res[cur][1] == 0) return cur;
          if (res[cur][0] + res[cur][1] != mx) {
                cur ++;
                continue;
          }
          int lf = res[cur][0];
          int rt = res[cur][1];
          int l = cur,r = min(cur + 700,n - 1);
          if (res[r].size() == 0)
            res[r] = ask(r);
          if (res[r][0] + res[r][1] == 0) return r;
          if (res[l] == res[r]) {
            cur = r + 1;
            continue;
          }
          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: 20 / 20
• Subtask 2: 72.52 / 80