BZOJ 1062 糖果雨

http://www.lydsy.com/JudgeOnline/problem.php?id=1062

思路:找到平行四边形以后，变换坐标：y->y-kx，k为斜率，这样变成了矩形，然后只要二维树状数组就行了、

注意可能因为取余的原因，把一个平行四边形拆成两半

 #include<algorithm>
 #include<cstdio>
 #include<cmath>
 #include<cstring>
 #include<iostream>
 int len2,len,len4,n;
 int tr[][][];
 int x[],y[];
 int lowbit(int X){
     return (X)&(-X);
 }
 int read(){
     int t=,f=;char ch=getchar();
     while (ch<''||ch>''){if (ch=='-') f=-;ch=getchar();}
     while (''<=ch&&ch<=''){t=t*+ch-'';ch=getchar();}
     return t*f;
 }
 void add(int k,int x,int y,int c){
     x++;y++;
     for (int i=x;i<=len2;i+=lowbit(i))
      for (int j=y;j<=len4;j+=lowbit(j))
       tr[k][i][j]+=c;
 }
 int sum(int k,int x,int y){
     if (x<||y<) return ;
     x++;y++;
     int ans=;
     if (x>len2) x=len2+;
     if (y>len4) y=len4+;
     for (int i=x;i;i-=lowbit(i))
      for (int j=y;j;j-=lowbit(j))
       ans+=tr[k][i][j];
     return ans;
 }
 int sum(int k,int x1,int y1,int x2,int y2){
     return sum(k,x2,y2)+sum(k,x1-,y1-)-sum(k,x2,y1-)-sum(k,x1-,y2);
 }
 int main(){
     n=read();len=read();len2=len<<;len4=len2<<;
     while (n--){
         int opt=read();
         if (opt==){
             int t=read(),c=read(),l=read(),r=read(),d=read();
             x[c]=(t-d*l+len2)%len2;
             y[c]=r-l;
             add(,x[c],y[c]+x[c],);
             add(,x[c],y[c]-x[c]+len2,);
         }else
         if (opt==)
         {
             int t=read(),l=read(),r=read();
             t%=len2;
             int k=(r==len);
             int ans=sum(,t,l+t,r+t,len4)+sum(,,l+t-len2,r+t-len2-k,len4)
             +sum(,t-r+len2+k,l-t,len2,len4)+sum(,t-r,l-t+len2,t-,len4);
             printf("%d\n",ans);
         }else{
             int t=read(),c=read();
             add(,x[c],y[c]+x[c],-);
             add(,x[c],y[c]-x[c]+len2,-);
         }
     }
 
 }