标签：des style blog http java color
题目链接：
http://acm.hdu.edu.cn/showproblem.php?pid=2795
题目：
Billboard
Time Limit: 20000/8000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 9562 Accepted Submission(s): 4259
Problem Description
At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is the place where all possible announcements are posted: nearest programming competitions, changes in the dining room menu,
and other important information.
On September 1, the billboard was empty. One by one, the announcements started being put on the billboard.
Each announcement is a stripe of paper of unit height. More specifically, the i-th announcement is a rectangle of size 1 * wi.
When someone puts a new announcement on the billboard, she would always choose the topmost possible position for the announcement. Among all possible topmost positions she would always choose the leftmost one.
If there is no valid location for a new announcement, it is not put on the billboard (that‘s why some programming contests have no participants from this university).
Given the sizes of the billboard and the announcements, your task is to find the numbers of rows in which the announcements are placed.
Input
There are multiple cases (no more than 40 cases).
The first line of the input file contains three integer numbers, h, w, and n (1 <= h,w <= 10^9; 1 <= n <= 200,000) - the dimensions of the billboard and the number of announcements.
Each of the next n lines contains an integer number wi (1 <= wi <= 10^9) - the width of i-th announcement.
Output
For each announcement (in the order they are given in the input file) output one number - the number of the row in which this announcement is placed. Rows are numbered from 1 to h, starting with the top row. If an announcement can‘t be put on the billboard,
output "-1" for this announcement.
Sample Input
Sample Output
Author
hhanger@zju
Source
这道题目是线段树。。然后要把那块板子顺时针旋转90°，则用tre数组保存在区间之间的最大可用长度，然后每次用完后，要用update去更新一下。。以后我对线段树深入了解后，在来完善。。
代码为：
#include<cstdio>
#include<algorithm>
#include<iostream>
#define lson num*2,s,mid
#define rson num*2+1,mid+1,e
using namespace std;
const int maxn=200000+10;
int tre[maxn<<2];
int h,w,n;
void pushup(int num)
{
tre[num]=max(tre[num*2],tre[num*2+1]);
}
void buildtree(int num,int s,int e)
{
tre[num]=w;
// printf("%d %d\n",num,tre[num]);
if(s==e)
return;
int mid=(s+e)/2;
buildtree(lson);
buildtree(rson);
}
void update(int num,int s,int e,int val)
{
if(s==e)
{
tre[num]=tre[num]-val;
printf("%d\n",s);
return;
}
int mid=(s+e)/2;
if(val<=tre[num*2]) update(lson,val);
else update(rson,val);
pushup(num);
}
int main()
{
while(~scanf("%d%d%d",&h,&w,&n))
{
if(h>n)
h=n;
buildtree(1,1,h);
for(int i=1;i<=n;i++)
{
int x;
scanf("%d",&x);
if(tre[1]<x)
printf("-1\n");
else
update(1,1,h,x);
//printf("%d %d %d %d %d\n",tre[1],tre[2],tre[3],tre[4],tre[5]);
}
}
return 0;
}
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标签：des style blog http java color
原文地址：http://blog.csdn.net/u014303647/article/details/36495739
