FatMouse and Cheese

FatMouse has stored some cheese in a city. The city can be considered as a square grid of dimension n: each grid location is labelled (p,q) where 0 <= p < n and 0 <= q < n. At each grid location Fatmouse has hid between 0 and 100 blocks of cheese in a hole. Now he's going to enjoy his favorite food.

FatMouse begins by standing at location (0,0). He eats up the cheese where he stands and then runs either horizontally or vertically to another location. The problem is that there is a super Cat named Top Killer sitting near his hole, so each time he can run at most k locations to get into the hole before being caught by Top Killer. What is worse -- after eating up the cheese at one location, FatMouse gets fatter. So in order to gain enough energy for his next run, he has to run to a location which have more blocks of cheese than those that were at the current hole.

Given n, k, and the number of blocks of cheese at each grid location, compute the maximum amount of cheese FatMouse can eat before being unable to move.

Input

There are several test cases. Each test case consists of

a line containing two integers between 1 and 100: n and k
n lines, each with n numbers: the first line contains the number of blocks of cheese at locations (0,0) (0,1) ... (0,n-1); the next line contains the number of blocks of cheese at locations (1,0), (1,1), ... (1,n-1), and so on.
The input ends with a pair of -1's.

Output

For each test case output in a line the single integer giving the number of blocks of cheese collected.

Sample Input

3 1
1 2 5
10 11 6
12 12 7
-1 -1

Sample Output

37

题解：nXn的格子，老鼠最初位置在（0，0），每次可以水平或竖直移动，移动范围<=k,并且每次移动到的格子的能量要

大于前一个，求最大总能量，具体看代码

贴代码：

#include
#include
#include
using namespace std;
int n,k,num;
int mp[110][110],dp[110][110];
int nextt[4][2]= {0,1,1,0,0,-1,-1,0};
int dfs(int x,int y)
{
    if(dp[x][y])//如果这个位置已经找过，直接返回值就好
        return dp[x][y];
    int num=0;
    for(int i=0; i<4; i++)
        for(int j=1; j<=k; j++)
        {
            int tx=x+j*nextt[i][0];
            int ty=y+j*nextt[i][1];//跳的格子数在K以内就好
            if(tx<0||ty<0||tx>=n||ty>=n)
                continue;
            if(mp[x][y]