hdu 1556 Color the ball （线段树做法）

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。

#include<stdio.h>
#pragma comment(linker,"/STACk:1024000000,1024000000")
struct CNode
{
    int L,R;
    //int nSum;
    int Inc;
    CNode *pLeft,*pRight;
};
CNode Tree[1000050];
int nCount;
int Mid(CNode *pRoot)
{
    return (pRoot->L+pRoot->R)/2;
}
void BuildTree(CNode *pRoot,int L,int R)
{
    pRoot->L=L;
    pRoot->R=R;
    //pRoot->nSum=0;
    pRoot->Inc=0;
    if(L==R)
        return ;
    nCount++;
    pRoot->pLeft=Tree+nCount;
    nCount++;
    pRoot->pRight=Tree+nCount;
    BuildTree(pRoot->pLeft,L,(L+R)/2);
    BuildTree(pRoot->pRight,(L+R)/2+1,R);
}
/*void Insert(CNode *pRoot,int i,int v)
{
    if(pRoot->L==i&&pRoot->R==i)
    {
        pRoot->nSum=v;
        return ;
    }
    pRoot->nSum+=v;
    if(i<=Mid(pRoot))
        Insert(pRoot->L,i,v);
    else
        Insert(pRoot->R,i,v);
}*/
void Add(CNode *pRoot,int a,int b)
{
    if(pRoot->L==a&&pRoot->R==b)
    {
        pRoot->Inc++;
        return ;
    }
    //pRoot->nSum+=c*(b-a+1);
    if(b<=Mid(pRoot))
        Add(pRoot->pLeft,a,b);
    else if(a>=Mid(pRoot)+1)
        Add(pRoot->pRight,a,b);
    else
    {
        Add(pRoot->pLeft,a,Mid(pRoot));
        Add(pRoot->pRight,Mid(pRoot)+1,b);
    }
}
int ans;
int QuerySum(CNode *pRoot,int a,int b,int i)
{
    ans+=pRoot->Inc;
    if(pRoot->L==i&&pRoot->R==i)
        return ans;//pRoot->nSum+(pRoot->R-pRoot->L+1)*pRoot->
    //pRoot->nSum+=(pRoot->R-pRoot->L)*pRoot->Inc;

    //Add(pRoot->pLeft,pRoot->L,Mid(pRoot),pRoot->Inc);
    //Add(pRoot->pRight,Mid(pRoot)+1,pRoot->R,pRoot->Inc);
    //pRoot->Inc=0;
    if(i<=Mid(pRoot))
        return QuerySum(pRoot->pLeft,a,b,i);
    else //(i>=Mid(pRoot)+1)
        return QuerySum(pRoot->pRight,a,b,i);
    /*else
    {
        return QuerySum(pRoot->pLeft,a,Mid(pRoot),i)
        +QuerySum(pRoot->pRight,Mid(pRoot)+1,b,i);
    }*/
}
int main()
{
    int n,a,b,i;
    while(scanf("%d",&n)!=EOF&&n)
    {
        nCount=0;
        BuildTree(Tree,1,n);

        for(i=0;i<n;i++)
        {
            scanf("%d%d",&a,&b);
            Add(Tree,a,b);
        }
        for(i=1;i<n;i++)
        {
            ans=0;
            printf("%d ",QuerySum(Tree,1,n,i));
        }
        ans=0;
        printf("%d\n",QuerySum(Tree,1,n,n));
    }
    return 0;
}