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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 on Problem 1088 and last updated at 2013-03-30 17:00:08
#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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