二维树状数组模板(区间修改+区间查询)

二维树状数组模板(区间修改+区间查询)

例题:JOIOI上帝造题的七分钟
一共两种操作:

\(L\ x_1\ y_1\ x_2\ y_2\ d\):把\((x_1,y_1)\)\((x_2,y_2)\)这个矩形内所有元素加\(d\)
\(k\ x_1\ y_1\ x_2\ y_2\):查询\((x_1,y_1)\)\((x_2,y_2)\)这个矩形内所有元素的和。

代码如下:

#include<bits/stdc++.h>
#define RG register
#define IL inline
#define _ 2050
#define ll long long
//#define ll int
using namespace std;

ll n , m , c1[_][_],c2[_][_],c3[_][_],c4[_][_] ;

IL void upt(ll x , ll y , ll dt){
	for(RG int i = x; i <= n; i += (i & -i) )
		for(RG ll j = y; j <= m; j += (j & -j)){
			c1[ i ][ j ] += dt ;
			c2[ i ][ j ] += dt * y;
			c3[ i ][ j ] += dt * x;
			c4[ i ][ j ] += dt * x * y;
		}
}
IL ll calc(ll x,ll y){
	RG ll res = 0;
	for(RG ll i = x; i > 0; i -= (i & -i))
		for(RG ll j = y; j > 0; j -= (j & -j)){
			res = res
				+ (x + 1) * (y + 1) * c1[ i ][ j ]
				- (x + 1) * c2[ i ][ j ]
				- (y + 1) * c3[ i ][ j ]
				+ c4[ i ][ j ] ; 
		}
	return res;
}

IL void add(ll X1,ll Y1,ll X2,ll Y2,ll dt){
	upt(X1 , Y1 , dt ) ;
	upt(X2 + 1 , Y1 , -dt ) ;
	upt(X1 , Y2 + 1, -dt ) ;
	upt(X2 + 1, Y2 + 1, dt ) ; 
}
IL ll query(ll X1,ll Y1,ll X2,ll Y2){
	return
		calc(X2 , Y2) + calc(X1 - 1, Y1 - 1) -
		calc(X1 - 1 , Y2) - calc(X2 , Y1 - 1) ;
}

int main(){
	ll X1 , X2 , Y1 , Y2 , z; char c[3]; 
	scanf("X %lld %lld",&n,&m);
	while(scanf("%s",c)!=EOF){
		scanf("%lld%lld%lld%lld", &X1, &Y1, &X2, &Y2);
		if(c[0]=='L'){
			scanf("%lld", &z);
			add(X1 , Y1 , X2 , Y2 , z);
		}
		else printf("%lld\n",query(X1 , Y1 , X2 , Y2 ));
	}return 0;return 0;
	
}

posted @ 2018-02-22 17:25  Guess2  阅读(540)  评论(0编辑  收藏  举报