Cod sursa(job #906171)

Utilizator Impaler_009Mihai Nitu Impaler_009 Data 6 martie 2013 16:08:37
Problema Arbori de intervale Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
using namespace std;
ifstream fin("arbint.in");
ofstream fout ("arbint.out");

int t[1<<18],a,b;

void update (int nod, int st, int dr)
{
	int i=nod<<1,j=(nod<<1)+1;
	if (st<dr)
	{
		int m=(st+dr)>>1;
		if (a<=m)
		update (i,st,m);
		else
		update (j,m+1,dr);
	}
	else  {t[nod]=b; return;}
	if (t[i]>t[j]) t[nod]=t[i];
	else t[nod]=t[j];
}

int query (int nod, int st, int dr)
{
	if (st<a||b<dr)
	{
		int m=(st+dr)>>1;
		int x=0,y=0;
		if (a<=m) x=query(nod<<1,st,m);
		if (b>m) y=query ((nod<<1)+1,m+1,dr);
		if (x<y) x=y;
		return x;	
	}
	else  return t[nod];
}

int main()
{
	int n,m,i,x; bool op;
	fin>>n>>m;
	for (a=1;a<=n;a++) {fin>>b; update (1,1,n);}
	for (i=1;i<=m;i++)
	{
		fin>>op>>a>>b;
		if (op==0) 
		{x=query(1,1,n); 
		fout<<x<<"\n";}
		else update (1,1,n);
	}
    return 0;
}