hdu 1556 涂气球 线段树(区间更新~对区间[x,y]更新,求任意节点被更新的次数)

Color the ball

Time Limit: 9000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 29526    Accepted Submission(s): 14356


Problem Description
N个气球排成一排,从左到右依次编号为1,2,3....N.每次给定2个整数a b(a <= b),lele便为骑上他的“小飞鸽"牌电动车从气球a开始到气球b依次给每个气球涂一次颜色。但是N次以后lele已经忘记了第I个气球已经涂过几次颜色了,你能帮他算出每个气球被涂过几次颜色吗?
 

 

Input
每个测试实例第一行为一个整数N,(N <= 100000).接下来的N行,每行包括2个整数a b(1 <= a <= b <= N)。
当N = 0,输入结束。
 

 

Output
每个测试实例输出一行,包括N个整数,第I个数代表第I个气球总共被涂色的次数。
 

 

Sample Input
3
1 1
2 2
3 3
3
1 1
1 2
1 3
0
 

 

Sample Output
1 1 1
3 2 1
 
//注意laz[]要和线段树数组开一样大小
#include<iostream>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stdio.h>
#include<string.h>
#include<algorithm>
const int  n = 100050;
using namespace std;
void pushdown(int num);
int tre[n * 4];
int laz[n*4];
void update(int num, int le, int ri, int x, int y,int z)
{
    if (x <= le && y >= ri)
    {
        tre[num] = tre[num] + z;//初值为0,z=1
        laz[num] = laz[num] + z;
        return;
    }
    pushdown(num);
    int mid = (le + ri) / 2;
    if (x <= mid)
        update(num * 2, le, mid, x, y, z);
    if (y > mid)
        update(num * 2 + 1, mid + 1, ri, x, y, z);
}
void pushdown(int num)
{
    if (laz[num] != 0)
    {
        tre[num * 2] += laz[num];
        tre[num * 2 + 1] += laz[num];
        laz[num * 2] += laz[num];
        laz[num * 2 + 1] += laz[num];
        laz[num] = 0;
    }
}
int query(int num, int le, int ri, int x)
{
    if (le == ri)
    {
        return tre[num];
    }
    pushdown(num);
    int mid = (le + ri) / 2;
    if (x <= mid)
        return query(num * 2, le, mid, x);
    else
        return query(num * 2 + 1, mid + 1, ri, x);
}
int main()
{
    int t;
    while (cin >> t)
    {
        memset(tre, 0, sizeof(tre));
        memset(laz, 0, sizeof(laz));//初始化延迟标记
        for (int i = 0; i < t; i++)
        {
            int x, y;
            cin >> x >> y;
            update(1, 1, t, x, y, 1);
            cout << query(1, 1, n, x) << endl;
        }
    }
    return 0;
}

 

用结构体储存数据

#include <stdio.h>
#include<iostream>
#include <string.h>
using namespace std;
struct node
{
    int left, right, count;
}c[100005 * 3];
int sum[100005];
void build(int le, int ri, int root)
{
    c[root].left = le;
    c[root].right = ri;
    c[root].count = 0;
    if (le == ri)
        return;
    int mid = (le + ri) / 2;
    build(le, mid, root * 2);
    build(mid + 1, ri, root * 2 + 1);
}
void update(int le, int ri, int root)//更新
{
    if (c[root].left == le && c[root].right == ri)//只需要在这个区间+1就行了,节省时间,不用找到每个数
    {
        c[root].count++;
        return;
    }
    int mid = (c[root].left + c[root].right) / 2;
    if (mid<le)//如果更新区间在右子树上,就只更新右区间
        update(le, ri, root * 2 + 1);
    else if (mid >= ri)//更新左子树
        update(le, ri, root * 2);
    else//更新区间即在右子树上,又在左子树上
    {
        update(le, mid, root * 2);
        update(mid + 1, ri, root * 2 + 1);
    }
}
void tosum(int root)//求和、记录每个气球被涂过的次数
{
    for (int i = c[root].left; i <= c[root].right; i++)
        sum[i] += c[root].count;
    if (c[root].left == c[root].right)
        return;
    tosum(root * 2);//通过子节点来更新父节点
    tosum(root * 2 + 1);
}
int main()
{
    int n;
    while (scanf("%d", &n) && n)
    {
        memset(sum, 0, sizeof(sum));
        memset(&c, 0, sizeof(&c));
        build(1, n, 1);
        for (int i = 0; i<n; i++)
        {
            int le, ri;
            scanf("%d %d", &le, &ri);
            update(le, ri, 1);
        }
        tosum(1);
        printf("%d", sum[1]);
        for (int i = 2; i <= n; i++)
            printf(" %d", sum[i]);
        printf("\n");
    }
    return 0;
}

 

posted @ 2018-11-30 20:15  知道了呀~  阅读(346)  评论(0编辑  收藏  举报