HDU - 1166 敌兵布阵（线段树，树状数组）

#include
#include

const int N = 50010;

int w[N],n;

struct Node
{
	int l,r,sum;
}tr[N*4];

void pushup(int u)
{
	tr[u].sum=tr[u<<1].sum+tr[u<<1|1].sum;
}

void build(int u,int l,int r)
{
    if(l==r) tr[u]={l,r,w[l]};
    else
    {
        tr[u]={l,r};
        int mid=l+r>>1;
        build(u<<1,l,mid);
		build(u<<1|1,mid+1,r);
        pushup(u);
    }
}

void update(int u,int x,int d)
{
    if(tr[u].l==x&&tr[u].r==x) tr[u].sum+=d;
    else
    {
        int mid=tr[u].l+tr[u].r>>1;
        if(x<=mid) update(u<<1,x,d);
        if(x>mid) update(u<<1|1,x,d);
        pushup(u);
    }
}

int query(int u,int l,int r)
{
    if(tr[u].l>=l&&tr[u].r<=r) return tr[u].sum;
    else
    {
        int mid=tr[u].l+tr[u].r>>1;
        int res=0;
        if(l<=mid) res=query(u<<1,l,r);
        if(r>mid) res+=query(u<<1|1,l,r);
        return res;
    }
}

int main()
{
	int T,t=1;scanf("%d",&T);
	while(T--)
	{
		printf("Case %d:n",t++);
		
		int n;scanf("%d",&n); 
		for(int i=1;i<=n;i++) scanf("%d",&w[i]);
		
		build(1,1,n);
		char op[10];
		while(scanf("%s",op)!=EOF)
		{
			if(strcmp(op,"End")==0) break;
			int l,r;scanf("%d%d",&l,&r);
			if(strcmp(op,"Add")==0) update(1,l,r);
			if(strcmp(op,"Sub")==0) update(1,l,-r);
			if(strcmp(op,"Query")==0) printf("%dn",query(1,l,r));
		}
	}
	return 0;
}

#include
#include

const int N = 50010;
int n,c[N];

int add(int x,int y){for(;x<=n;x+=(x&-x)) c[x]+=y;}
int getsum(int x){int res=0;for(;x;x-=(x&-x)) res+=c[x];return res;}

int main()
{
	int T,t=1;scanf("%d",&T);
	while(T--)
	{
		memset(c,0,sizeof c);
		printf("Case %d:n",t++);
		
		scanf("%d",&n); 
		for(int i=1;i<=n;i++) 
		{
			int x;scanf("%d",&x);
			add(i,x);
		}
		
		char op[10];
		while(scanf("%s",op)!=EOF)
		{
			if(strcmp(op,"End")==0) break;
			int l,r;scanf("%d%d",&l,&r);
			if(strcmp(op,"Add")==0) add(l,r);
			if(strcmp(op,"Sub")==0) add(l,-r);
			if(strcmp(op,"Query")==0) printf("%dn",getsum(r)-getsum(l-1));
		}
	}
	return 0;
}