Submission #246860

#	Time	Username	Problem	Language	Result	Execution time	Memory
246860		hhh07	The Big Prize (IOI17_prize)	C++14	90 / 100	101 ms	512 KiB

prize

#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <utility>
#include <set>
#include <cmath>
#include <cstring>
#include "prize.h"

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<ll, ll> ii;

int find_best(int n){
    vector<int> res;
    int maxi = 0;
    for (int i = 0; i < min(500, n); i++){
        res = ask(i);
        if (res[0] + res[1] == 0)
            return i;
        maxi = max(maxi, res[0] + res[1]);
    }
    
    int i = 500;
    
    while(i < n){
        
            res = ask(i);
        if (res[0] + res[1] == 0)
            return i;
        if (res[0] + res[1] == maxi){
            int beg = i + 1, end = n - 1;
            while(beg < end){
                int mid = (beg + end)/2;
                vi t;
                    t = ask(mid);
                if (t[0] + t[1] == 0)
                    return mid;
                if (t[0] + t[1] < maxi)
                    end = mid;
                else{
                    if (res[1] - t[1] > 0)
                        end = mid - 1;
                    else
                        beg = mid + 1;
                }
            }
            
                res = ask(beg);
            if (res[0] + res[1] == 0)
                return beg;
            i = beg + 1;
        }
        else
            i++;
    }
    return i;
}

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80