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Submission #61770

# Submission time Handle Problem Language Result Execution time Memory
61770 2018-07-26T16:02:24 Z zadrga The Big Prize (IOI17_prize) C++14
20 / 100
 136 ms 5620 KB 
#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF (1 << 30)
#define MOD (1000 * 1000 * 1000 + 7)
#define maxn 201111
#define SQRT 450
#define BUCKET 5000

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;

int max_val;
int ans;
bool used[maxn];
vector<int> v[maxn];

vector<int> ASK(int x){
	if(!used[x]){
		v[x] = ask(x);
		used[x] = 1;
	}
	return v[x];
}

void solve(int L, int D){
	if(ans != -1 || L > D)
		return;

	int l = -1, d = -1;
	vector<int> left, right;
	for(int i = L; i <= D; i++){
		left = ASK(i);

		if(left[0] + left[1] == 0){
			ans = i;
			return;
		}

		if(left[0] + left[1] == max_val){
			l = i;
			break;
		}
	}

	if(l == -1)
		return;

	for(int i = D; i > l; i--){
		right = ASK(i);

		if(right[0] + right[1] == 0){
			ans = i;
			return;
		}

		if(right[0] + right[1] == max_val){
			d = i;
			break;
		}
	}
	if(d == -1)
		return;

	int num = left[1] - right[1];
	if(num == 0)
		return;

	int mid = (l + d) / 2;
	solve(l + 1, mid);
	solve(mid + 1, d - 1);
}

int find_best(int n){
	max_val = ans = -1;
	for(int i = 0; i < min(SQRT + 50, n); i++){
		vector<int> ret = ASK(i);
		max_val = max(max_val, ret[0] + ret[1]);
	}

	solve(0, n - 1);
	return ans;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 4984 KB Output is correct
2 Correct 14 ms 5136 KB Output is correct
3 Correct 14 ms 5144 KB Output is correct
4 Correct 16 ms 5284 KB Output is correct
5 Correct 15 ms 5284 KB Output is correct
6 Correct 13 ms 5284 KB Output is correct
7 Correct 11 ms 5284 KB Output is correct
8 Correct 11 ms 5284 KB Output is correct
9 Correct 15 ms 5284 KB Output is correct
10 Correct 16 ms 5284 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 5284 KB Output is correct
2 Correct 11 ms 5328 KB Output is correct
3 Correct 16 ms 5328 KB Output is correct
4 Correct 16 ms 5328 KB Output is correct
5 Correct 17 ms 5328 KB Output is correct
6 Correct 15 ms 5328 KB Output is correct
7 Correct 16 ms 5328 KB Output is correct
8 Correct 15 ms 5328 KB Output is correct
9 Correct 16 ms 5328 KB Output is correct
10 Correct 14 ms 5328 KB Output is correct
11 Correct 22 ms 5328 KB Output is correct
12 Correct 17 ms 5328 KB Output is correct
13 Correct 41 ms 5540 KB Output is correct
14 Correct 18 ms 5540 KB Output is correct
15 Correct 45 ms 5540 KB Output is correct
16 Incorrect 136 ms 5620 KB Incorrect
17 Halted 0 ms 0 KB -