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Submission #827987

# Submission time Handle Problem Language Result Execution time Memory
827987 2023-08-17T00:46:10 Z arnold518 Rarest Insects (IOI22_insects) C++17
0 / 100
 1 ms 208 KB 
#include "insects.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2000;

int A[MAXN+10], B[MAXN+10];

int min_cardinality(int N)
{
	for(int i=0; i<N; i++)
	{
		move_inside(i); A[i]=1;
		if(press_button()>1)
		{
			move_outside(i); A[i]=0;
		}
	}
	int cnt=0;
	for(int i=0; i<N; i++) cnt+=A[i];
	for(int i=0; i<N; i++) if(A[i]) A[i]=0, B[i]=1;
	if(cnt==1) return N;
	if(cnt==2)
	{
		for(int i=0; i<N; i++) move_inside(i);
		return N-press_button();
	}
	if(cnt==N) return 1;

	int lo=2, hi=N/cnt+1;
	int val=cnt;
	while(lo+1<hi)
	{
		int mid=lo+hi>>1, t=val;
		for(int i=0; i<N; i++)
		{
			if(t==mid*cnt) break;
			if(B[i]) continue;

			move_inside(i); A[i]=1; t++;
			if(press_button()>mid)
			{
				move_outside(i); A[i]=0; t--;
			}
		}

		if(t==mid*cnt)
		{
			lo=mid;
			for(int i=0; i<N; i++) if(!B[i] && A[i]) B[i]=1, A[i]=0, val++;
		}
		else
		{
			hi=mid;
			for(int i=0; i<N; i++) if(!B[i] && !A[i]) B[i]=2;
			for(int i=0; i<N; i++) if(A[i]) move_outside(i), A[i]=0;
		}
	}
	return lo;
}

Compilation message

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:38:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   38 |   int mid=lo+hi>>1, t=val;
      |           ~~^~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 208 KB Output is correct
4 Correct 0 ms 208 KB Output is correct
5 Incorrect 1 ms 208 KB Wrong answer.
6 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB Output is correct
2 Correct 0 ms 208 KB Output is correct
3 Correct 0 ms 208 KB Output is correct
4 Correct 0 ms 208 KB Output is correct
5 Incorrect 1 ms 208 KB Wrong answer.
6 Halted 0 ms 0 KB -

Subtask #3
0 / 75.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 208 KB Wrong answer.
2 Halted 0 ms 0 KB -