标签:
http://poj.org/problem?id=1088
Time Limit: 1000MS | Memory Limit: 65536K | |
Total Submissions: 79806 | Accepted: 29701 |
Description
1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9
Input
Output
Sample Input
5 5 1 2 3 4 5 16 17 18 19 6 15 24 25 20 7 14 23 22 21 8 13 12 11 10 9
Sample Output
25
解题思路:记忆化搜索。
代码:
1 #include <iostream> 2 #include <cstdio> 3 #include <cstring> 4 #include <algorithm> 5 6 using namespace std; 7 8 #define N 102 9 10 int n,m,a[N][N],h[N][N]; 11 int xy[2][4]={{0,0,1,-1},{1,-1,0,0}}; 12 13 bool Check(int x,int y); 14 int Dfs(int x,int y); 15 16 int main(){ 17 int ans=1; 18 scanf("%d %d",&n,&m); 19 for(int i=0;i<n;i++) 20 for(int j=0;j<m;j++) 21 scanf("%d",&a[i][j]); 22 memset(h,-1,sizeof(h)); 23 for(int i=0;i<n;i++) 24 for(int j=0;j<m;j++) 25 ans=max(ans,Dfs(i,j)); 26 printf("%d\n",ans); 27 return 0; 28 } 29 bool Check(int x,int y){ 30 return x>=0&&x<n&&y>=0&&y<m; 31 } 32 int Dfs(int x,int y){ 33 if(h[x][y]!=-1) return h[x][y]; 34 int tx,ty; 35 h[x][y]=1; 36 for(int i=0;i<4;i++){ 37 tx=x+xy[0][i]; 38 ty=y+xy[1][i]; 39 if(Check(tx,ty)&&a[x][y]>a[tx][ty]){ 40 h[x][y]=max(h[x][y],Dfs(tx,ty)+1); 41 }else continue; 42 } 43 return h[x][y]; 44 }
标签:
原文地址:http://www.cnblogs.com/jiu0821/p/4306353.html