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Cod sursa(job #967213)
#include <fstream>
using namespace std;
ifstream fin("arbint.in");
ofstream fout ("arbint.out");
int t[1<<18],a,b;
void create_tree (int nod, int st, int dr)
{
do
{
int m=(st+dr)>>1;
if (a<=m)
{
nod=nod*2;
dr=m;
}
else
{
nod=(nod<<1)+1;
st=m+1;
}
t[nod]= max (t[nod],b);
}while (st!=dr);
}
void update (int nod, int st, int dr)
{
if (st==dr) t[nod]=b;
else
{
int m=(st+dr)>>1;
if (a<=m)
update (nod*2,st,m);
else
update (nod*2+1,m+1,dr);
t[nod] = max (t[nod*2],t[nod*2+1]);
}
}
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; create_tree (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;
}