제출 #62561

#제출 시각아이디문제언어결과실행 시간메모리
62561zetapi크레이피쉬 글쓰는 기계 (IOI12_scrivener)C++14
34 / 100
1092 ms69584 KiB
#include <bits/stdc++.h>
using namespace std;

#define pb  push_back
#define mp  make_pair
#define ll  long long
#define itr ::iterator 

typedef pair<int,int>  pii;

const int MAX=1e6+99;

char X[MAX];

int ind,tot,arr[MAX],height[MAX],Parent[MAX][25];

void Init() 
{

}

void TypeLetter(char L) 
{
	X[++ind]=L;
	Parent[ind][0]=arr[tot++];
	height[ind]=height[Parent[ind][0]]+1;
	for(int A=1;A<25;A++)
		Parent[ind][A]=Parent[Parent[ind][A-1]][A-1];
	arr[tot]=ind;
	return ;
}

void UndoCommands(int U) 
{
	arr[++tot]=arr[tot-U];
	return ;
}

char GetLetter(int P) 
{
	int res=arr[tot];
	for(int A=24;A>=0;A--)
	{
		if(height[Parent[res][A]]>P)
			res=Parent[res][A];
	}
	return X[res];
}

/*signed main()
{
	ios_base::sync_with_stdio(false);

	
	TypeLetter('a');
	TypeLetter('b');
	TypeLetter('d');
	UndoCommands(2);
	UndoCommands(1);
	cout<<GetLetter(2);
	return 0;
}*/

컴파일 시 표준 에러 (stderr) 메시지

scrivener.cpp: In function 'void UndoCommands(int)':
scrivener.cpp:35:6: warning: operation on 'tot' may be undefined [-Wsequence-point]
  arr[++tot]=arr[tot-U];
      ^~~~~
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