Submission #119856

#	Time	Username	Problem	Language	Result	Execution time	Memory
119856		TuGSGeReL	The Big Prize (IOI17_prize)	C++14	20 / 100	51 ms	504 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#define ll long long
#define mp make_pair
#define pub push_back
#define pob pop_back()
#define ss second
#define ff first
#define mt make_tuple
#define pof pop_front()
#define fbo find_by_order
#define ook order_of_key
#define lb lower_bound
#define ub upper_bound

typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> indexed_set;
using pll = pair <ll, ll>;
using pii = pair <int, int>;

int a[200001], ans = -1;
vector <int> resl, resr;

void solve(int l, int r) {	
	if ( ans != -1 || l > r )
		return;
	
	resl = ask(l);
	resr = ask(r);
	
	if ( resl[0] + resl[1] == 0 ) {
		ans = l;
		return;
	}
	
	if ( resr[0] + resr[1] == 0 ) {
		ans = r;
		return;
	}
	
	if (resl[0] + resl[1] < resr[0] + resr[1]) {
		solve(l + 1, r);
		return;
	}
	
	if (resl[0] + resl[1] > resr[0] + resr[1]) {
		solve(l, r - 1);
		return;
	}
	
	if ( resl[0] == resr[0] )
		return;
	
	int mid = (l + r) / 2;
	
	solve(l, mid);
	solve(mid, r);
}

int find_best(int n) {
	
	int idx = -1, mx = 0;
	
	for (int i = 0; i < min(n, 500); i++) {
		vector <int> res = ask(i);
		
		if ( res[0] + res[1] == 0 )
			return i;
		
		if ( res[0] + res[1] > mx ) {
			mx = res[0] + res[1];
			idx = i;
		}
	}
	
	solve(idx, n - 1);
	
	return ans;
}

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