Submission #20808

#	Time	Username	Problem	Language	Result	Execution time	Memory
20808		jjwdi0	Crayfish scrivener (IOI12_scrivener)	C++11	Compilation error	0 ms	0 KiB

scrivener

int par[1<<20][21], size[1<<20], kth, Q;
char a[1<<20];
void Init(){}
void TypeLetter(char x)
{
	if(kth) par[kth][0] = kth - 1;
	for(int i = 1; par[kth][i-1]; i++)
	{
		par[kth][i] = par[par[kth][i-1]][i-1];
	}
	a[kth] = x, size[kth] = size[par[kth][0]] + 1, kth++;
}
void UndoCommand(int x)
{
	par[kth][0] = kth - x - 1;
	for(int i = 1; par[kth][i-1]; i++)
	{
		par[kth][i] = par[par[kth][i-1]][i-1];
	}
	a[kth] = a[par[kth][0]], size[kth] = size[par[kth][0]], kth++;
}
char GetLetter(int x)
{
	int u = kth - 1;
	for(int i = 19; i + 1; i--)
	{
		if(size[par[u][i]] > x) u = par[u][i];
	}
	return a[u];
}

Compilation message (stderr)

/tmp/ccWTkxvi.o: In function `main':
grader.cpp:(.text.startup+0x14b): undefined reference to `UndoCommands(int)'
collect2: error: ld returned 1 exit status