Submission #246372

#	Time	Username	Problem	Language	Result	Execution time	Memory
246372		ant101	Crayfish scrivener (IOI12_scrivener)	C++14	Compilation error	0 ms	0 KiB

scrivener

#include <bits/stdc++.h>
#define N 1000050
#define log 22
using namespace std;

int n, id;

struct node
{
	char c;

	node *anc[log];

	int sz;

	node()
	{
		for(int i = 0; i < log ; i++) anc[i] = NULL;

		sz = 0;
	}
};

node *tree[N];

void TypeLetter(char c)
{
	int tmp = ++id;

	if(!tree[tmp]) tree[tmp] = new node();

	tree[tmp]->c = c;

	tree[tmp]->anc[0] = tree[tmp - 1];

	for(int i = 1; i < log; i++)
	{
	 	(tree[tmp]->anc[i]) = (tree[tmp]->anc[i - 1] ? (tree[tmp]->anc[i - 1])->anc[i - 1] : NULL);
	}

	tree[tmp]->sz = tree[tmp - 1]->sz + 1;
}

void UndoCommands(int k)
{
	int tmp = ++id;

	tree[tmp] = tree[tmp - k - 1];
}

char GetLetter(int k)
{	
	int tmp = id;

	node *root = tree[tmp];

	int up = root->sz - k - 1;

	for(int i = log - 1; i >= 0; i--)
	{
		if(up - (1<<i) >= 0)
		{
			up -= (1<<i);

			root = root->anc[i];
		}
	}

	return root->c;
}

void Init()
{
	id = 0;

	tree[0] = new node();
}

int main()
{
	ios::sync_with_stdio(false); cin.tie(0);

	cin>>n;

	tree[0] = new node();

	while(n--)
	{
		char a, b;

		int c;

		cin>>a;

		if(a == 'T')
		{
			cin>>b;

			TypeLetter(b);
		}

		if(a == 'U')
		{
			cin>>c;

			UndoCommands(c);
		}

		if(a == 'P')
		{
			cin>>c;

			cout<<GetLetter(c)<<"\n";
		}
	}
}

Compilation message (stderr)

/tmp/ccKEBy6L.o: In function `main':
scrivener.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cccBVJZy.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status