hdu4614----Vases and Flowers

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Vases and Flowers

Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others)
Total Submission(s): 2120 Accepted Submission(s): 822

Problem Description

　　Alice is so popular that she can receive many flowers everyday. She has N vases numbered from 0 to N-1. When she receive some flowers, she will try to put them in the vases, one flower in one vase. She randomly choose the vase A and try to put a flower in the vase. If the there is no flower in the vase, she will put a flower in it, otherwise she skip this vase. And then she will try put in the vase A+1, A+2, ..., N-1, until there is no flower left or she has tried the vase N-1. The left flowers will be discarded. Of course, sometimes she will clean the vases. Because there are too many vases, she randomly choose to clean the vases numbered from A to B(A <= B). The flowers in the cleaned vases will be discarded.

Input

　　The first line contains an integer T, indicating the number of test cases.
　　For each test case, the first line contains two integers N(1 < N < 50001) and M(1 < M < 50001). N is the number of vases, and M is the operations of Alice. Each of the next M lines contains three integers. The first integer of one line is K(1 or 2). If K is 1, then two integers A and F follow. It means Alice receive F flowers and try to put a flower in the vase A first. If K is 2, then two integers A and B follow. It means the owner would like to clean the vases numbered from A to B(A <= B).

Output

　　For each operation of which K is 1, output the position of the vase in which Alice put the first flower and last one, separated by a blank. If she can not put any one, then output ‘Can not put any one.‘. For each operation of which K is 2, output the number of discarded flowers.
　　Output one blank line after each test case.

Sample Input

Sample Output

[pre]3 7
2
1 9
4
Can not put any one.

2 6
2
0 9
4
4 5
2 3

[/pre]

Source

2013 Multi-University Training Contest 2

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线段树,维护区间空花瓶数量,查询时我们需要查询区间第一个空花瓶位置,区间最后一个空花瓶的位置,以及区间内空花瓶的数量

/*************************************************************************
    > File Name: seg_8.cpp
    > Author: ALex
    > Mail: 405045132@qq.com 
    > Created Time: 2015年01月11日 星期日 16时27分59秒
 ************************************************************************/

#include <map>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

const int N = 50010;

struct node
{
	int l, r;
	int add;
	int cnt; //空花瓶数目
}tree[N << 2];

void pushdown (int p)
{
	if (tree[p].add != -1)
	{
		if (tree[p].add == 1)
		{
			tree[p << 1].cnt = 0;
			tree[p << 1 | 1].cnt = 0;
			tree[p << 1].add = tree[p].add;
			tree[p << 1 | 1].add = tree[p].add;
		}
		else
		{
			tree[p << 1].cnt = tree[p << 1].r - tree[p << 1].l + 1;
			tree[p << 1 | 1].cnt = tree[p << 1 | 1].r - tree[p << 1 | 1].l + 1;
			tree[p << 1].add = tree[p].add;
			tree[p << 1 | 1].add = tree[p].add;
		}
		tree[p].add = -1;
	}
}

void build (int p, int l, int r)
{
	tree[p].l = l;
	tree[p].r = r;
	tree[p].cnt = r - l + 1;
	tree[p].add = -1;
	if (l == r)
	{
		return;
	}
	int mid = (l + r) >> 1;
	build (p << 1, l, mid);
	build (p << 1 | 1, mid + 1, r);
}

void update (int p, int l, int r, int sa)
{
	if (l == tree[p].l && tree[p].r == r)
	{
		if (sa)
		{
			tree[p].cnt = 0; //放花
			tree[p].add = 1;
		}
		else
		{
			tree[p].cnt = tree[p].r - tree[p].l + 1; //取花
			tree[p].add = 0;
		}
		return;
	}
	pushdown (p);
	int mid = (tree[p].l + tree[p].r) >> 1;
	if (r <= mid)
	{
		update (p << 1, l, r, sa);
	}
	else if (l > mid)
	{
		update (p << 1 | 1, l, r, sa);
	}
	else
	{
		update (p << 1, l, mid, sa);
		update (p << 1 | 1, mid + 1, r, sa);
	}
	tree[p].cnt = tree[p << 1].cnt + tree[p << 1 | 1].cnt;
//	printf("区间[%d, %d] 有 %d 个 空花瓶\n", tree[p].l, tree[p].r, tree[p].cnt);
}

int query_num (int p, int l, int r)
{
	if (l == tree[p].l && r == tree[p].r)
	{
		return tree[p].cnt;
	}
	pushdown (p);
	int mid = (tree[p].l + tree[p].r) >> 1;
	if (r <= mid)
	{
		return query_num (p << 1, l, r);
	}
	else if (l > mid)
	{
		return query_num (p << 1 | 1, l, r);
	}
	else
	{
		return query_num (p << 1, l, mid) + query_num (p << 1 | 1, mid + 1, r);
	}
}

int dfs (int p, int l, int r, int x)
{
	if (tree[p].l == tree[p].r)
	{
		return tree[p].l;
	}
	pushdown (p);
	int mid = (tree[p].l + tree[p].r) >> 1;
	if (r <= mid)
	{
		return dfs (p << 1, l, r, x);
	}
	else if (l > mid)
	{
		return dfs (p << 1 | 1, l, r, x);
	}
	else
	{
		int cnt = query_num (1, l, mid);
		if (cnt >= x)
		{
			return dfs (p << 1, l, mid, x);
		}
		else
		{
			return dfs (p << 1 | 1, mid + 1, r, x - cnt);
		}
	}
}

int main()
{
	int t;
	scanf("%d", &t);
	while (t--)
	{
		int n, m, k, x, f;
		scanf("%d%d", &n, &m);
		build (1, 0, n - 1);
		while (m--)
		{
			scanf("%d%d%d", &k, &x, &f);
			if (k == 2)
			{
				int cnt = query_num (1, x, f);
				printf("%d\n", f - x + 1 - cnt);
				update (1, x, f, 0);
			}
			else
			{
				int cnt = query_num (1, x, n - 1);
				if (cnt == 0)
				{
					printf ("Can not put any one.\n");
					continue;
				}
				int s = dfs (1, x, n - 1, 1);
				if (cnt >= f)
				{
					int e = dfs(1, x, n - 1, f);
					printf("%d %d\n", s, e);
					update (1, s, e, 1);
				}
				else
				{
					int e = dfs(1, x, n - 1, cnt);
					printf("%d %d\n", s, e);
					update (1, s, e, 1);
				}
			}
		}
		printf("\n");
	}
	return 0;
}

hdu4614----Vases and Flowers

标签：线段树

原文地址：http://blog.csdn.net/guard_mine/article/details/42613315

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