제출 #302397

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
302397		arnold518	식물 비교 (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)%N==*lower_bound(V.begin(), V.end(), y)%N)
	{
		if(R[x]) return -1;
		else return 1;
	}
	x+=N;
	swap(x, y);
	if(*lower_bound(V.begin(), V.end(), x+1)%N==*lower_bound(V.begin(), V.end(), y)%N)
	{
		if(R[x]) return 1;
		else return -1;
	}

	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

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

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