http://acm.timus.ru/problem.aspx?space=1&num=1126

简单的线段树求区间最值

 #include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
const int N=;
int a[N],ans ;
struct node
{
int l,r,Max;
} tree[N*];
void build(int t,int l,int r)
{
tree[t].l = l;
tree[t].r = r;
if (l==r)
{
tree[t].Max = a[r];
return ;
}
int mid = (l+r)>>;
build(t<<,l,mid);
build(t<<|,mid+,r);
tree[t].Max = max(tree[t<<].Max,tree[t<<|].Max);
}
void Query(int t,int l,int r)
{
if (l <= tree[t].l && r>= tree[t].r)
{
ans = max(ans,tree[t].Max);
return ;
}
int mid = (tree[t].l+tree[t].r)>>;
if (r <= mid)
Query(t<<,l,r);
else if (l > mid)
Query(t<<|,l,r);
else
{
Query(t<<,l,mid);
Query(t<<|,mid+,r);
}
}
int main()
{
int m,n = ,x;
scanf("%d",&m);
while()
{
scanf("%d",&x);
if (x == -)
break;
a[n++] = x;
}
build(,,n);
for (int i = ; i <= n-m; i++)
{
ans = ;
Query(,i,m+i-);
printf("%d\n",ans);
}
return ;
}

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