Submission #302412

#	Time	Username	Problem	Language	Result	Execution time	Memory
302412		arnold518	Comparing Plants (IOI20_plants)	C++14	0 / 100	1 ms	384 KiB

plants

#include "plants.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 = 2e5;

int N, K, R[MAXN+10];
vector<int> V;

void init(int _K, vector<int> _R)
{
	K=_K; N=_R.size();
	for(int i=0; i<N; i++) R[i]=_R[i];

	for(int i=0; i<N; i++)
	{
		if(R[i]!=R[(i+1)%N]) V.push_back(i);
	}
	for(int i=0; i<N; i++)
	{
		if(R[i]!=R[(i+1)%N]) V.push_back(i+N);
	}
	for(int i=0; i<N; i++)
	{
		if(R[i]!=R[(i+1)%N]) V.push_back(i+N+N);
	}

	return;
}

int compare_plants(int x, int y)
{
	int ans=0;

	if(*lower_bound(V.begin(), V.end(), x+1)==*lower_bound(V.begin(), V.end(), y))
	{
		if(R[x]) return -1;
		else return 1;
	}
	x+=N;
	swap(x, y);
	if(*lower_bound(V.begin(), V.end(), x+1)==*lower_bound(V.begin(), V.end(), y))
	{
		if(R[(y-1)%N]) return 1;
		else return -1;
	}

	return 0;
}

Compilation message (stderr)

plants.cpp: In function 'int compare_plants(int, int)':
plants.cpp:37:6: warning: unused variable 'ans' [-Wunused-variable]
   37 |  int ans=0;
      |      ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25