hdu 1166敵兵布陣(線分樹入門題)

#include<cstring>
#include<cstdio>


#define M 50005
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1

int sum[M<<2];

void PushPlus(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);
	PushPlus(rt);
}

void Updata(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)
		Updata(p,add,lson);
	else
		Updata(p,add,rson);

	PushPlus(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 ans=0;
	if(L<=m )
		ans+=Query(L,R,lson);
	if(R>m)
		ans+=Query(L,R,rson);

	return ans;
}
int main(){
		
	int T,n,p;
	scanf("%d",&T);
	for( p=1 ; p<=T ; p++ ){
		printf("Case %d:
",p);
		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] == 'Q')
				printf("%d
",Query(a,b,1,n,1));
			else if(op[0] == 'S')
				Updata(a,-b,1,n,1);
			else
				Updata(a,b,1,n,1);

		}

	}
	return 0;
}