Submission #1284709

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284709		mariaclara	커다란 상품 (IOI17_prize)	C++17	20 / 100	14 ms	412 KiB

prize

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

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second

int max_loli;

int query(int l, int r, int pl, int pr) {
    int ml = (l+r)/2 - 1, mr = ml + 1, pml = pr, pmr = max_loli;

    while(mr <= r) {
        vi rsp = ask(mr);

        if(rsp[0] + rsp[1] == max_loli) {
            pml = rsp[0] - (mr - ml - 1);
            pmr = rsp[0];
            mr++;
            break;
        }

        if(rsp[0] + rsp[1] == 0) return mr;
        mr++; pml--;
    }

    int ret = -1;
    if(pl < pml and l <= ml) ret = query(l, ml, pl, pml);
    if(pmr < pr and mr <= r and ret == -1) ret = query(mr, r, pmr, pr);

    return ret;
}

mt19937 rng(time(0));

int rand(int a, int b) {
    uniform_int_distribution<int> val(a,b);
    return val(rng);
}

int find_best(int N) {
    for(int i = 1; i <= 200; i++) {
        int x = rand(0, N-1);
        vi rsp = ask(x);
        max_loli = max(max_loli, rsp[0] + rsp[1]);
        if(rsp[0] + rsp[1] == 0) return x;
    }

    return query(0, N-1, 0, max_loli);
}

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