bzoj1452: [JSOI2009]Count

二维BIT。。。

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
#define rep(i,n) for(int i=1;i<=n;i++)
#define clr(x,c) memset(x,c,sizeof(x))
int read(){
	int x=0;char c=getchar();
	while(!isdigit(c)){
		c=getchar();
	}
	while(isdigit(c)) x=x*10+c-'0',c=getchar();
	return x;
}
const int nmax=305;
const int maxn=105;
#define lowbit(x) ((x)&-(x))
int g[nmax][nmax],n,m,q;
struct node{
	int a[nmax][nmax];
	node(){clr(a,0);}
	void add(int x,int y,int v){
		for(int i=x;i<=n;i+=lowbit(i))
		  for(int j=y;j<=m;j+=lowbit(j)) a[i][j]+=v;
	}
	int sum(int x,int y){
		int ans=0;
		for(int i=x;i;i-=lowbit(i))
		  for(int j=y;j;j-=lowbit(j)) ans+=a[i][j];
		return ans;
	}
}; 
node nodes[maxn];
int main(){
	n=read(),m=read();
	rep(i,n) rep(j,m) g[i][j]=read(),nodes[g[i][j]].add(i,j,1);
	q=read();
	rep(i,q){
		int temp=read();
		if(temp==1){
			int u=read(),v=read(),d=read();
			nodes[g[u][v]].add(u,v,-1);
			g[u][v]=d;nodes[d].add(u,v,1);
		}else{
			int u=read(),d=read(),v=read(),w=read(),tmp=read();
			printf("%d
",nodes[tmp].sum(d,w)+nodes[tmp].sum(--u,--v)-nodes[tmp].sum(u,w)-nodes[tmp].sum(d,v));
		}
	}
	return 0;
}

　　

1452: [JSOI2009]Count

Time Limit: 10 Sec  Memory Limit: 64 MB
Submit: 1932  Solved: 1148
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Description

Input

Output

Sample Input

Sample Output

1
2

HINT

Source

 

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