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Re:还是超时,我已经记忆化搜索了,代码附上,求建议啊

Posted by kanxue2002 at 2013-03-30 18:11:44 on Problem 1088
In Reply To:还是超时,我已经记忆化搜索了,代码附上 Posted by:kanxue2002 at 2013-03-30 16:37:04
> #include <cstdlib>
> #include <iostream>
> #include <stdio.h>
> using namespace std;
> int map[105][105];
> int len[105][105];//最大高度 
> int dir[4][2]={
> 	1,0,
> 	0,-1,
> 	-1,0,
> 	0,1
> 	} ;//四方向数组 
> int m,n;//行,列 
> int i,j;//深搜坐标点 
> void find(int x,int y,int h){//x,y为当前坐标,h为当前点的高度
> 	++h;
> 	if(h>len[i][j])
> 		len[i][j]=h;
> 	int tx,ty;
> 	for(int k=0;k<4;++k){
> 		tx=x+dir[k][0];
> 		ty=y+dir[k][1];
> 		if(tx>=0&&tx<m)//行越界判断 
> 			if(ty>=0&&ty<n)//列越界判断 
> 				if(map[x][y]>map[tx][ty]){
> //					cout<<h<<'\t'<<ti<<'\t'<<tj<<'\t'<<map[ti][tj]<<endl;
> 					if(tx<i&&ty<j){//这个点已经搜过了 
> 						len[i][j]=h+len[tx][ty]>len[i][j]?h+len[tx][ty]:len[i][j];//如果当前点高度加之前高度大于最大高度 则赋值 
> 						continue;
> 						}//dp
> 					find(tx,ty,h);// 将下一点作为当前点递归调用 
> 					}//当前点高度是否比周围点高
> 		}
> 	--h; 
> 	}
> int main(int argc, char *argv[])
> {
> 	int max;//全地图最大高度 
> 	scanf("%d %d",&m,&n);
> 	while(m!=0&&n!=0){
> 		max=0;
> 		for(i=0;i<m;++i) 
> 			for(j=0;j<n;++j){
> 				scanf("%d",&map[i][j]);//输入地图
> 			}
> 		for(i=0;i<m;++i) 
> 			for(j=0;j<n;++j){
> 				find(i,j,0);//深搜 
> 				if(max<len[i][j])
> 					max=len[i][j];//求全地图最大高度 
> 				}
> 		printf("%d\n",max);
> 	scanf("%d %d",&m,&n);
> 	}
>     return 0;
> }

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