Submission #597868

#	Time	Username	Problem	Language	Result	Execution time	Memory
597868		yanndev	The Big Prize (IOI17_prize)	C++17	90 / 100	107 ms	5140 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
 
vector<int> ans[200042];
 
vector<int> query(int i) {
    if (ans[i].empty())
        return ans[i] = ask(i);
    return ans[i];
}
 
int find_best(int n) {
    int mxVal = 0;
    for (int i = 0; i < min(n, 500); i++) {
        auto x = query(i);
        mxVal = max(mxVal, x[0] + x[1]);
    }

    for (int i = 0; i < n; i++) {
        vector<int> a = query(i);
        if (a[0] == 0 && a[1] == 0)
            return i;
        if (a[0] + a[1] < mxVal)
            continue;
        
        int l = i;
        int r = n;
        while (l < r) {
            int m = (l + r + 1) / 2;
            vector<int> b = ask(m);
            if (b[0] == a[0] && b[1] == a[1])
                l = m;
            else
                r = m - 1;
        }

		//cout << "poor range " << i << ' ' << l << '\n';
        i = l;
    }

    return -1;
}

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