【CDQ分治】BZOJ2683 简单题

题面在这里

把每个询问操作Q分为4个（容斥）

然后对于每个Q，要求出 tA<tQ,xA≤xQ,yA≤yQ 的 wA 之和

直接CDQ分治就好了

示例程序：

#include
#include
using namespace std;
typedef long long ll;
inline char nc(){
    static char buf[100000],*p1=buf,*p2=buf;
    return p1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++;
}
inline int red(){
    int res=0,f=1;char ch=nc();
    while (ch<'0'||'9'if (ch=='-') f=-f;ch=nc();}
    while ('0'<=ch&&ch<='9') res=res*10+ch-48,ch=nc();
    return res*f;
}

const int maxn=800005;
int n,q;
bool vis[maxn];
struct data{
    int t,x,y,w;
    inline bool operator<(const data&b)const {return x#define lowbit(x) ((x)&-(x))
ll BIT[maxn],ans[maxn];
inline void ist(int x,int w){
    for (int i=x;i<=n;i+=lowbit(i)) BIT[i]+=w;
}
inline ll ask(int x){
    ll res=0;
    for (int i=x;i;i-=lowbit(i)) res+=BIT[i];
    return res;
}
void CDQ(int l,int r){
    if (l==r) return;
    int mid=l+r>>1;
    CDQ(l,mid);CDQ(mid+1,r);
    for (int i=l;i<=r;i++){
        t[i]=a[i];
        if (i<=mid) t[i].t=0;
    }
    sort(t+l,t+1+r);
    for (int i=l;i<=r;i++){
        if (!t[i].t&&t[i].w) ist(t[i].y,t[i].w);
        if (t[i].t&&!t[i].w) ans[t[i].t]+=ask(t[i].y);
    }
    for (int i=l;i<=r;i++) if (!t[i].t&&t[i].w) ist(t[i].y,-t[i].w);
}
int main(){
    n=red()+1;
    for (int c=red();c!=3;c=red())
     if (c==1){
        a[++q].x=red()+1,a[q].y=red()+1;
        a[q].t=q;a[q].w=red();vis[q]=1;
     }else{
        int x=red()+1,y=red()+1,xx=red()+1,yy=red()+1;
        a[++q].x=xx;a[q].y=yy;a[q].t=q;
        a[++q].x=xx;a[q].y=y-1;a[q].t=q;
        a[++q].x=x-1;a[q].y=yy;a[q].t=q;
        a[++q].x=x-1;a[q].y=y-1;a[q].t=q;
     }
    CDQ(1,q);
    for (int i=1;i<=q;i++)
     if (!vis[i]) printf("%lld\n",ans[i]-ans[i+1]-ans[i+2]+ans[i+3]),i+=3;
    return 0;
}