Submission #282446

#	Time	Username	Problem	Language	Result	Execution time	Memory
282446		doowey	The Big Prize (IOI17_prize)	C++14	20 / 100	91 ms	1072 KiB

prize

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


using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair

map<int,pii> res;

pii get(int x){
    if(res.count(x)) return res[x];
    vector<int> g = ask(x);
    res[x] = mp(g[0], g[1]);
    return mp(g[0],g[1]);
}

int low = 0;

int find_best(int n) {
    pii cur;
    for(int i = 0 ; i < min(n,500); i ++ ){
        cur = get(i);
        if(cur.fi + cur.se == 0)
            return i;
        low = max(low, cur.fi + cur.se);
    }
    int p = -1;
    int cc;
    int li, ri, mid;
    pii nw;
    while(1){
        cc = p + 1;
        cur = get(cc);
        if(cur.fi + cur.se == 0)
            return cc;
        if(cur.fi + cur.se < low){
            p = cc + 1;
        }
        else{
            li = p, ri = n-1;
            while(li < ri){
                mid = (li + ri) / 2;
                nw = get(mid);
                if(nw.fi + nw.se == 0)
                    return mid;
                if(nw.fi + nw.se < low){
                    ri = mid;
                }
                else{
                    if(nw.fi - cur.fi == 0)
                        li = mid + 1;
                    else
                        ri = mid - 1;
                }
            }
            cur = get(li);
            if(cur.fi + cur.se == 0)
                return li;
            p = li;
        }
    }
	return -1;
}

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