【线段树】线段树系列 0.1单点修改单点求和线段树

终于搞定了单点修改线段树。。。3个月。。操蛋。。根本没有模板题。。觉得太弱了。。。艹蛋。。。必须进一步更新我的版本啊

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
using namespace std;
struct node
{
    int left,right,value;
};
node point[100];
int father[100];
int g;
void buildtree(int i,int left,int right)
{
    father[i]=(int)floor(i)/2.0;
    point[i].left=left;
    point[i].right=right;
    point[i].value=0;
    if (left==right) {father[i]=i;}
    else
    {
    buildtree(i<<1, left, (int)floor( (right+left) / 2.0)); 
    buildtree((i<<1) + 1, (int)floor( (right+left) / 2.0) + 1, right);  
    }
}
//----------------------------------------------------------------------------
void update(int x,int add,int left,int right,int now) //left，right是范围，add是加上的值，now是当前节点的标号，x是目标节点 
{
    int mid=(left+right)>>1;
    point[now].value+=add;
    if ( (right-left)<1 ) {g=left; return;}
    if ( (left<=x) && (x<=mid) ) { update(x,add,left,mid,2*now); }
    if ( ((mid+1)<=x) && (x<=right) ) { update(x,add,mid+1,right,2*now+1); }
}
//----------------------------------------------------------------------------
int search(int x,int now)
{
    if (point[now].left==point[now].right) {return (point[now].value);}
    int mid=(point[now].left+point[now].right)>>1;
    if ( (point[now].left<=x) && (x<=mid) ) { return (search(x,2*now)); }
    if ( ((mid+1)<=x) && (x<=point[now].right) ) { return (search(x,2*now+1)); }
    return 598460606;
}
//----------------------------------------------------------------------------
int main()
{
    int n,m,k;
    cin>>n;
    buildtree(1,1,n);
    for (int i=1;i<=n;i++)
    {
        int x,ad;
        cin>>x>>ad;
        update(x,ad,1,n,1); 
    }
    cin>>m;
    for (int i=1;i<=m;i++) 
    {
        int x,ad;
        cin>>x>>ad;
        update(x,ad,1,n,1);
        
    }
    cin>>k;
    for (int i=1;i<=k;i++)
    {
        int s;
        cin>>s;
        cout<<search(s,1)<<endl;
    }
}