hdu 1166 排兵布阵

/* ***********************************************
Author        :xryz
Email         :523689985@qq.com
Created Time  :4-22 20:46:48
File Name     :hdu排兵布阵.cpp
************************************************ */

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;

int c[50000+5];
int lowbit (int x)
{
    return x&-x;
}
int sum(int x)
{
    int ret=0;
    while(x>0)
    {
        ret+=c[x];
        x-=lowbit(x);
    }
    return ret;
}

void add(int x,int d,int n)
{
    while(x<=n)
    {
        c[x]+=d;
        x+=lowbit(x);
    }
}

int main()
{
    int t,i,n,j,m,tmp1,tmp2;
    char s[24];
    scanf("%d",&t);
    for(int ii=1;ii<=t;ii++)
    {
        scanf("%d",&n);
        memset(c,0,sizeof(c));
        for(i=1;i<=n;i++)
        {
            scanf("%d",&m);
            add(i,m,n);
        }
        printf("Case %d:
",ii);
        while(~scanf("%s",s))
        {
            if(strcmp(s,"End")==0) break;
            if(s[0]=='A') 
            {
                scanf("%d%d",&i,&j);
                add(i,j,n);
            }
            else if(s[0]=='Q')
            {
                scanf("%d%d",&i,&j);
                if(i>1) 
                {i--;
                tmp1=sum(i);
                }
                else tmp1=0;
                tmp2=sum(j);
                printf("%d
",tmp2-tmp1);
            }
            else if(s[0]=='S')
            {
                scanf("%d%d",&i,&j);
                add(i,-j,n);
            }
        }
    }
    return 0;
}

线段树

#include<stdio.h>
#include<algorithm>
#include<string.h>
using namespace std;
struct node
{
    int left,right,sum;
} tree[200000+5];

int a[50000+5];

void make(int id,int l,int r)//建树
{
    tree[id].left=l;
    tree[id].right=r;
    if(l==r)
    {
        tree[id].sum=a[l];
    }
    else
    {
        int mid=(l+r)/2;
        make(id*2,l,mid);
        make(id*2+1,mid+1,r);
        tree[id].sum=tree[id*2].sum+tree[id*2+1].sum;
    }
}

void add(int id,int pos,int d)//单点更新
{
    tree[id].sum+=d;
    if(tree[id].left==tree[id].right) return ;
    int mid=(tree[id].left+tree[id].right)/2;
    if(pos>mid) add(id*2+1,pos,d);
    else add(id*2,pos,d);

}

int query(int l,int r,int id)//查询
{
    if(tree[id].left==l&&tree[id].right==r)
        return tree[id].sum;
    else
    {
        int mid=(tree[id].left+tree[id].right)/2;
        if(r<=mid) return query(l,r,id*2);
        else if(l>mid) return query(l,r,id*2+1);
        else
            return query(l,mid,id*2)+query(mid+1,r,id*2+1);

    }
}

int main()
{
    int T,i,n,j,l,r;
    char s[10];
    scanf("%d",&T);
    for(int k=1; k<=T; k++)
    {

        scanf("%d",&n);
        a[0]=0;
        for(i=1; i<=n; i++) scanf("%d",&a[i]);
        make(1,1,n);
        printf("Case %d:
",k);
        while(~scanf("%s",s))
        {
            if(strcmp(s,"End")==0) break;
            else if(strcmp(s,"Add")==0)
            {
                scanf("%d%d",&i,&j);
                add(1,i,j);
            }
            else if(strcmp(s,"Sub")==0)
            {
                scanf("%d%d",&i,&j);
                add(1,i,-j);
            }
            else
            {
                scanf("%d%d",&i,&j);
                int ans=query(i,j,1);
                printf("%d
",ans);
            }
        }
    }
    return 0;
}

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