Submission #103896

#	Time	Username	Problem	Language	Result	Execution time	Memory
103896		turbat	The Big Prize (IOI17_prize)	C++14	20 / 100	41 ms	888 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
using vi = vector <int>;
using pii = pair <int, int>;
#define pb push_back
#define mp make_pairdefine F first
#define S second
#define N 200005
int mx, fen[N], cnt;
void add(int x){
	x++, cnt++;
	while (x < N){
		fen[x]++;
		x += x & -x;
	}
}
int query(int x){
	x++;
	int s = 0;
	while (x > 0){
		s += fen[x];
		x -= x & -x;
	}
	return s;
}
int gg(int l, int r){
	if (l == r) {
		vi tmp = ask(l); 
		add(l);
		return tmp[0] + tmp[1] == 0 ? l : -1;
	}
	vi tmp, tmp1;
	while (l <= r){
		tmp = ask(l);
		if (tmp[0] + tmp[1] == 0) return l;
		if (tmp[0] + tmp[1] == mx) break;
		add(l);
		l++;
	}
	while(l <= r){
		tmp1 = ask(r);
		if (tmp1[0] + tmp1[1] == 0) return r;
		if (tmp1[0] + tmp1[1] == mx) break;
		add(r);
		r--;
	}
	if (l > r) return -1;
	if (tmp1[0] == tmp[0]) return -1;
	int mid = (l + r) / 2;
	return max(gg(l, mid), gg(mid + 1, r));
}
int find_best(int n) {
	if (n <= 5000)
		for(int i = 0; i < n; i++) {
			std::vector<int> res = ask(i);
				if(res[0] + res[1] == 0)
					return i;
			}
	vector <vi> vc;
	for (int i = 0;i < 450;i++){
		vi ans = ask(i);
		vc.pb(ans);
		int t = ans[0] + ans[1];
		if (!t) return i;
		mx = max(mx, t);
	}
	for (int i = 0;i < 450;i++)
		if (mx != vc[i][0] + vc[i][1])
			add(i);
	return gg(450, n - 1);
}

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