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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#430060 | #4565. Rarest Insects | james1BadCreeper# | 0 | 7ms | 4112kb | C++17 | 1.7kb | 2024-06-03 12:53:27 | 2024-06-03 12:53:27 |
answer
#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 2e3 + 5;
// 最多问 3n 次询问
int n, m, k, id[N], cnt;
vector<int> arr;
bool in[N];
mt19937 Rand(time(0));
void Move_inside(int x) { move_inside(id[x] - 1); }
void Move_outside(int x) { move_outside(id[x] - 1); }
bool check(int x) { // 最罕见的昆虫是否能 >= x
cnt = n;
for (int i : arr) {
Move_inside(i); in[i] = 1;
if (press_button() > x) {
Move_outside(i), in[i] = 0, --cnt;
if (cnt < k * x) {
for (int i : arr)
if (in[i]) Move_outside(i), in[i] = 0;
return 0;
}
}
}
if (cnt == k * x) {
vector<int> newarr;
for (int i : arr)
if (in[i]) newarr.emplace_back(i);
arr = newarr;
}
return cnt == k * x;
}
int min_cardinality(int N) {
n = N;
k = n;
for (int i = 1; i <= n; ++i) id[i] = i;
shuffle(id + 1, id + n + 1, Rand);
for (int i = 1; i <= n; ++i) {
Move_inside(i);
if (press_button() > 1) Move_outside(i), --k, arr.emplace_back(i);
}
// 最罕见的出现次数是 1,当且仅当什么时候?
int L = 0, R = n / k + 1; // [2, n / k]
while (L + 1 != R) {
int mid = L + R >> 1;
if (check(mid)) L = mid;
else R = mid; // 最罕见的昆虫一定 < mid
}
return L;
}
// 我们可以知道的信息:
// n 次代价知道昆虫种类数 k
// n 次代价知道最常见的昆虫基数
// 那么最罕见的昆虫的基数至多是 n / k
// 直接扫,
Details
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 3724kb
input:
6 1 2 1 1 2 2 2 2 2
output:
8 0 5 8 2 8 0 4 8 2 8 1 4 8 0 0 8 2 8 0 1 8 2 8 0 2 8 2 8 1 2 8 0 3 8 2 8 1 3 8 0 4 8 2 8 1 4 8 0 2 8 2 8 1 2 8 0 3 8 2 8 1 3 8 3 2
result:
wrong answer Wrong answer.
Subtask #2:
score: 0
Wrong Answer
Test #24:
score: 0
Wrong Answer
time: 7ms
memory: 3788kb
input:
1000 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2...
output:
8 0 332 8 2 8 0 834 8 2 8 1 834 8 0 252 8 2 8 1 252 8 0 485 8 2 8 1 485 8 0 20 8 2 8 1 20 8 0 157 8 2 8 1 157 8 0 277 8 2 8 1 277 8 0 294 8 2 8 1 294 8 0 671 8 2 8 1 671 8 0 167 8 2 8 1 167 8 0 497 8 2 8 1 497 8 0 696 8 2 8 1 696 8 0 734 8 2 8 1 734 8 0 380 8 2 8 1 380 8 0 731 8 2 8 1 731 8 0 347 8 ...
result:
wrong answer Wrong answer.
Subtask #3:
score: 0
Wrong Answer
Test #43:
score: 75
Accepted
time: 1ms
memory: 3828kb
input:
2 1 2 2
output:
8 0 1 8 2 8 0 0 8 2 8 1 0 8 0 0 8 2 8 1 0 8 3 2
result:
ok
Test #44:
score: 75
Accepted
time: 1ms
memory: 3840kb
input:
2 1 1
output:
8 0 1 8 2 8 0 0 8 2 8 3 1
result:
ok
Test #45:
score: 75
Accepted
time: 0ms
memory: 4068kb
input:
3 1 1 2 2
output:
8 0 1 8 2 8 0 0 8 2 8 0 2 8 2 8 1 2 8 0 2 8 2 8 1 2 8 3 1
result:
ok
Test #46:
score: 75
Accepted
time: 1ms
memory: 4112kb
input:
6 1 2 2 2 1 2 2 3 3 3 2 2 2 2
output:
8 0 5 8 2 8 0 4 8 2 8 1 4 8 0 0 8 2 8 1 0 8 0 1 8 2 8 1 1 8 0 2 8 2 8 0 3 8 2 8 1 3 8 0 4 8 2 8 0 0 8 2 8 1 0 8 0 1 8 2 8 1 1 8 0 3 8 2 8 1 3 8 1 4 8 0 4 8 2 8 1 4 8 0 0 8 2 8 1 0 8 0 1 8 2 8 1 1 8 0 3 8 2 8 1 3 8 3 1
result:
ok
Test #47:
score: 0
Wrong Answer
time: 1ms
memory: 4072kb
input:
10 1 2 1 2 2 2 2 2 2 2 2 2 3 3 4 4 4 4 3 3 3 3
output:
8 0 5 8 2 8 0 4 8 2 8 1 4 8 0 7 8 2 8 0 1 8 2 8 1 1 8 0 9 8 2 8 1 9 8 0 3 8 2 8 1 3 8 0 6 8 2 8 1 6 8 0 0 8 2 8 1 0 8 0 2 8 2 8 1 2 8 0 8 8 2 8 1 8 8 0 4 8 2 8 0 1 8 2 8 0 9 8 2 8 0 3 8 2 8 0 6 8 2 8 1 6 8 0 0 8 2 8 1 0 8 0 2 8 2 8 1 2 8 0 8 8 2 8 1 8 8 0 4 8 2 8 0 1 8 2 8 0 9 8 2 8 0 3 8 2 8 3 3
result:
wrong answer Wrong answer.