线段树模板-敌兵布阵 HDU - 1166

#include <bits/stdc++.h>
using namespace std;
const int maxn=2e5+10;
int s[maxn];
int a[maxn];
void built_tree(int start,int end,int node)
{
        if(start==end)
        {
                scanf("%d",&s[node]);
                return;
        }
        int mid=(start+end)/2;
        int left_node=2*node+1;
        int right_node=2*node+2;
        built_tree(start,mid,left_node);
        built_tree(mid+1,end,right_node);
        s[node]=s[left_node]+s[right_node];
}
void updata_stree(int start,int node,int dex,int val)
{
        if(start==end)
        {
                s[node]+=val;
                return;
        }
        int mid=(start+end)/2;
        int left_node=2*node+1;
        int right_node=2*node+2;
        if(dex<=mid){
                updata_stree(start,left_node,dex,val);
        }
        else{
                updata_stree(mid+1,right_node,val);
        }
        s[node]=s[left_node]+s[right_node];
}
int query_stree(int start,int L,int R)
{
        if(R<start||L>end)
        {
                return 0;
        }
        else if(L<=start&&end<=R)
        {
                return s[node];
        }
        else if(start==end){
                return s[node];
        }
        int mid=(start+end)/2;
        int left_node=node*2+1;
        int right_node=node*2+2;
        int sum_left=query_stree(start,L,R);
        int sum_right=query_stree(mid+1,R);
        return sum_left+sum_right;
}
int main()
{
        int T;
        scanf("%d",&T);
        int flag=1;
        while(T--)
        {
                int n;
                scanf("%d",&n);
                built_tree(0,n-1,0);
                string x;
                printf("Case %d:n",flag++);
                while(cin>>x)
                {
                        if(x=="End")
                                break;
                        if(x[0]==‘Q‘){
                                int u,v;
                                scanf("%d%d",&u,&v);
                                //cout<<"u="<<u<<endl;
                                //cout<<"v="<<v<<endl;
                                cout<<query_stree(0,0,u-1,v-1)<<endl;
                        }
                        else if(x[0]==‘A‘){
                                int dex,val;
                                scanf("%d%d",&dex,&val);
                                //cout<<"dex="<<dex<<endl;
                                //cout<<"val="<<val<<endl;
                                updata_stree(0,dex-1,val);
                        }
                        else if(x[0]==‘S‘){
                               int dex,dex-1,-val);
                        }
                }
        }
    return 0;
}