Submission #54024

#	Time	Username	Problem	Language	Result	Execution time	Memory
54024		chpipis	The Big Prize (IOI17_prize)	C++11	90 / 100	87 ms	1428 KiB

prize

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

using namespace std;

typedef vector<int> vi;

int num_q;
map<int, vi> memo;

vi query(int x) {
    if (memo.count(x)) return memo[x];
    num_q++;
    vi ret = ask(x);
    return memo[x] = ret;
}

int find_best(int n) {
    memo.clear();
    num_q = 0;
    int mx = -1;
    for (int i = 0, j; i < n; i = j + 1) {
        if (i == n - 1) return i;
        j = i;
        vi cur = query(i);
        if (cur[0] + cur[1] == 0) return i;
        if (cur[0] + cur[1] < mx) continue;
        mx = max(mx, cur[0] + cur[1]);
        int lo = i + 1, hi = n - 1;
        while (lo <= hi) {
            int mid = (lo + hi) >> 1;
            vi now = query(mid);
            if (now[0] + now[1] == 0) return mid;
            if (now == cur) {
                lo = mid + 1;
                j = mid;
            } else {
                hi = mid - 1;
            }
        }
    }
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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