HDU.1556 Color the ball (线段树 区间更新 单点查询)

题意分析

注意一下pushdown 和 pushup

模板类的题还真不能自己套啊，手写一遍才行

代码总览

#include <bits/stdc++.h>

#define nmax 200000

using namespace std;

struct Tree{

    int l,r,val;

    int lazy;

    int mid(){

        return (l+r)>>1;

    }

};

Tree tree[nmax<<2];

int num[nmax<<2];

void PushUp(int rt)

{

    tree[rt].val = tree[rt<<1].val + tree[rt<<1|1].val;

}

void PushDown(int rt)

{

    if(tree[rt].lazy){

        tree[rt<<1].lazy += tree[rt].lazy;

        tree[rt<<1|1].lazy += tree[rt].lazy;

        tree[rt<<1].val += tree[rt].lazy ;

        tree[rt<<1|1].val +=tree[rt].lazy;

        tree[rt].lazy = 0;

    }

}

void Build(int l, int r, int rt)

{

    tree[rt].l = l; tree[rt].r = r;

    tree[rt].val = tree[rt].lazy = 0;

    if(l == r){

        return;

    }

    Build(l,tree[rt].mid(),rt<<1);

    Build(tree[rt].mid()+1,r,rt<<1|1);

    PushUp(rt);

}

void UpdatePoint(int val, int pos, int rt)

{

    if(tree[rt].l == tree[rt].r){

        tree[rt].val+=val;

        return;

    }

    PushDown(rt);

    if(pos<= tree[rt].mid()) UpdatePoint(val,pos,rt<<1);

    else UpdatePoint(val,pos,rt<<1|1);

    PushUp(rt);

}

void UpdateInterval(int val, int l, int r, int rt)

{

    if(tree[rt].l >r || tree[rt].r < l) return;

    if(tree[rt].l >= l && tree[rt].r <= r){

        tree[rt].val+= val;

        tree[rt].lazy+= val;

        return;

    }

    PushDown(rt);

    UpdateInterval(val,l,r,rt<<1) ;

    UpdateInterval(val,l,r,rt<<1|1);

    PushUp(rt);

}

int Query(int l,int r,int rt)

{

    if(l>tree[rt].r || r<tree[rt].l) return 0;

    PushDown(rt);

    if(l <= tree[rt].l && tree[rt].r <= r) return tree[rt].val;

    else return Query(l,r,rt<<1) +Query(l,r,rt<<1|1);

}

int T,N,a,b;

int main()

{

    //freopen("in.txt","r",stdin);

    while(scanf("%d",&N) != EOF && N){

        Build(1,N,1);

        for(int i = 0;i<N;++i){

            scanf("%d %d",&a,&b);

            UpdateInterval(1,a,b,1);

        }

        for(int i = 1;i<=N;++i){

            if(i == 1) printf("%d",Query(i,i,1));

            else printf(" %d",Query(i,i,1));

        }

        printf("\n");

    }

    return 0;

}