Submission #1025287

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1025287	2024-07-16T19:17:52 Z	Issa	Rarest Insects (IOI22_insects)	C++17	0 / 100	41 ms	600 KB

insects

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
pair<int, int> pii;

const int maxn = 1e5 + 100;

int n, d, sz;
int used[maxn];
int f[maxn];

void move_inside(int i);
void move_outside(int i);
int press_button();

void add(int i){
	sz++;
	used[i] = 1;
	move_inside(i);
}
void del(int i){
	sz--;
	used[i] = 0;
	move_outside(i);
}
void clear(){
	for(int i = 1; i <= n; i++){
		if(used[i]) del(i);
	}
}

bool ok(int k){
	bool res;
	for(int i = 0; i < n; i++){
		if(used[i]) continue;
		add(i);
		if(press_button() > k){
			del(i);
		} else{
			if(f[i]){
				res = 1;
				break;
			} else if(sz >= 1ll * d * k){
				res = 0;
				break;
			}
		}
	}
	if(res){
		for(int i = 0; i < n; i++){
			if(used[i] == 1){
				del(i);
			} else if(used[i] == 0){
				used[i] = 2;
			}
		}
	} else{
		for(int i = 0; i < n; i++){
			if(used[i]) used[i] = 2;
		}
	}
	return res;
}

int min_cardinality(int N){
	d = 0; n = N;
	for(int i = N - 1; i >= 0; i--){
		add(i);
		if(press_button() == 1) f[i] = 1, d++;
		else del(i);
	} clear();
	int ans = n / d;
	for(int l = 1, r = n / d - 1; l <= r;){
		int mid = (l + r) >> 1;
		if(!ok(mid)) l = mid + 1;
		else r = mid - 1, ans = mid;
	}
	return ans;
}

Compilation message

insects.cpp: In function 'bool ok(int)':
insects.cpp:49:2: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |  if(res){
      |  ^~

Subtask #1

0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	344 KB	Output is correct
3	Correct	0 ms	344 KB	Output is correct
4	Correct	0 ms	344 KB	Output is correct
5	Correct	1 ms	344 KB	Output is correct
6	Correct	2 ms	344 KB	Output is correct
7	Correct	1 ms	344 KB	Output is correct
8	Correct	3 ms	344 KB	Output is correct
9	Correct	4 ms	344 KB	Output is correct
10	Incorrect	7 ms	344 KB	Wrong answer.
11	Halted	0 ms	0 KB	-

Subtask #2

0 / 15.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	0 ms	344 KB	Output is correct
3	Correct	0 ms	344 KB	Output is correct
4	Correct	0 ms	344 KB	Output is correct
5	Correct	1 ms	344 KB	Output is correct
6	Correct	2 ms	344 KB	Output is correct
7	Correct	1 ms	344 KB	Output is correct
8	Correct	3 ms	344 KB	Output is correct
9	Correct	4 ms	344 KB	Output is correct
10	Incorrect	7 ms	344 KB	Wrong answer.
11	Halted	0 ms	0 KB	-

Subtask #3

0 / 75.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	344 KB	Output is correct
3	Correct	0 ms	344 KB	Output is correct
4	Correct	1 ms	344 KB	Output is correct
5	Correct	0 ms	344 KB	Output is correct
6	Correct	1 ms	344 KB	Output is correct
7	Correct	26 ms	348 KB	Output is correct
8	Correct	13 ms	592 KB	Output is correct
9	Correct	22 ms	460 KB	Output is correct
10	Correct	22 ms	344 KB	Output is correct
11	Correct	19 ms	344 KB	Output is correct
12	Correct	10 ms	600 KB	Output is correct
13	Correct	27 ms	464 KB	Output is correct
14	Correct	27 ms	460 KB	Output is correct
15	Correct	27 ms	344 KB	Output is correct
16	Incorrect	41 ms	344 KB	Wrong answer.
17	Halted	0 ms	0 KB	-