Submission #1079318

#	Time	Username	Problem	Language	Result	Execution time	Memory
1079318		speedcode	The Big Prize (IOI17_prize)	C++17	0 / 100	68 ms	11352 KiB

prize

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

vector<int> dp[200000];

vector<int> myAsk(int n) {
    if (dp[n][0] == -1) dp[n] = ask(n);
    return dp[n];
}

int find_best(int n) {
    for (int i = 0; i < n; i++) {
        dp[i] = {-1, -1};
    }

    int maxi = 0;
    for (int i = 0; i < min(450, n); i++) {
        maxi = max(maxi, myAsk(i)[0] + myAsk(i)[1]);
    }

    int last = 0;
    auto a = myAsk(0);
    if (a[0] + a[1] == 0) return 0;

    int y = n;
    while (y--) {
        int i1 = last + 1;
        int i2 = n - 1;
        if (myAsk(i1)[0] + myAsk(i1)[1] == maxi) {
            last = i1;
            continue;
        }
        while (i1 != i2) {
            int middle = (i1 + i2) / 2;
            auto a = myAsk(middle);
            if (a[0] + a[1] == 0) return middle;

            if(middle == i1) {
                i1 = i2;
            }else {
                auto b = myAsk(i1);
                if(a[0]-b[0] > 0) {
                    if(a[0]+a[1] < maxi) {
                        i1 = middle;
                    }else i1 = middle-1;
                }else {
                    if(a[0]+a[1] < maxi) {
                        i1 = middle;
                    }else i1 = middle+1;
                }
            }
        }

        auto a = myAsk(i1);
        if (a[0] + a[1] == 0) return i1;
        last = i1;
    }

    return 0;
}

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