hdu 1166 敌兵布阵（单点更新，区间查询）

const int maxn = 50005;
int sum[maxn<<2];

void PushUp(int rt){
    sum[rt] = sum[rt<<1] + sum[rt<<1|1];
}

void build(int l,int r,int rt){
    if(l==r){
        scanf("%d",&sum[rt]);
        return;
    }
    int m = (l + r) >> 1;
    build(lson);
    build(rson);
    PushUp(rt);
}

void update(int p,int add,int l,int r,int rt){
    if(l==r){
        sum[rt] += add;
        return;
    }
    int m = (l + r) >> 1;
    if(p <= m) update(p,add,lson);
    else update(p,add,rson);
    PushUp(rt);
}

int query(int L,int R,int l,int r,int rt){
    if(L<=l && r<=R){
        return sum[rt];
    }
    int m = (l + r) >> 1;
    int ret = 0;
    if(L <= m) ret += query(L,R,lson);
    if(R > m) ret += query(L,R,rson);
    return ret;
}


int main(){

    int T,n;


    scanf("%d",&T);
    for(int t=1;t<=T;++t){

        printf("Case %d:\n",t);

        scanf("%d",&n);
        build(1,n,1);

        char op[10];
        while(scanf("%s",op)){
            if(op[0] == ‘E‘) break;
            int a, b;
            scanf("%d%d",&a,&b);
            if(op[0] == ‘A‘) update(a,b,1,n,1);
            else if(op[0] == ‘S‘) update(a,-b,1,n,1);
            else if(op[0] == ‘Q‘) printf("%d\n",query(a,b,1,n,1));
        }

    }

}

int n;
int a[50005];
int C[50005];

void init(){
    rep(i,1,n){
        C[i]=0;
        for(int j=i-lowbit(i)+1;j<=i;j++){
                C[i]+=a[j];
        }
    }
}
void add(int x,int y){
    for(int i=x;i<=n;i+=lowbit(i)){
        C[i]+=y;
    }
}

int calc(int x){
    if(x==0) return 0;
    int ans=0;
    for(int i=x;i>0;i-=lowbit(i))
        ans+=C[i];
    return ans;
}
int query(int x,int y){
    return calc(y)-calc(x-1);
}

int main(){

    int T;
    cin>>T;
    rep(t,1,T){
        scanf("%d",&n);
        rep(i,1,n){
            scanf("%d",&a[i]);
        }

        init();

        printf("Case %d:\n",t);

        char ope[10];
        while(1){
            scanf("%s",ope);
            if(ope[0]==‘E‘) break;
            int x,y;
            if(ope[0]==‘A‘){
                scanf("%d%d",&x,&y);
                add(x,y);
            }
            else if(ope[0]==‘S‘){
                scanf("%d%d",&x,&y);
                add(x,-y);
            }
            else{
                scanf("%d%d",&x,&y);
                int ans=query(x,y);
                printf("%d\n",ans);
            }
        }
    }

    return 0;
}