UVA 825 Walking on the Safe Side（重做）

这道题改天重新做一下：

高人的代码：

#include<stdio.h>
#include<string.h>
#include<ctype.h>
#define MAXD 1010
char b[10010];
int N, M, G[MAXD][MAXD], f[MAXD][MAXD];
void solve()
{
    int i, j, k;
    gets(b);
    sscanf(b, "%d%d", &N, &M);
    memset(G, 0, sizeof(G));
    for(i = 1; i <= N; i ++)
    {
        gets(b);
        for(j = 0; isdigit(b[j]); j ++);
        while(b[j])
        {
            if(isdigit(b[j]))
            {
                sscanf(b + j, "%d", &k);
                G[i][k] = 1;
                while(isdigit(b[j]))
                    j ++;
            }
            else
                j ++;
        }
    }
    for(i = 0; i <= N; i ++)
        f[i][0] = 0;
    for(i = 0; i <= M; i ++)
        f[0][i] = 0;
    f[1][0] = 1;
    for(i = 1; i <= N; i ++)
        for(j = 1; j <= M; j ++)
        {
            f[i][j] = 0;
            if(!G[i][j])
            {
                f[i][j] += f[i - 1][j];
                f[i][j] += f[i][j - 1];
            }
            printf("i=%d j=%d f[i][j]=%d\n",i,j,f[i][j]);
        }
    printf("%d\n", f[N][M]);
}
int main()
{
    int t;
    gets(b);
    sscanf(b, "%d", &t);
    while(t)
    {
        gets(b);
        solve();
        if(-- t)
            printf("\n");
    }
    return 0;
}

我的代码：（wrong answer）

#include<stdio.h>
#include<string.h>
#define MAXN 10110
int cros[MAXN][MAXN], f[MAXN][MAXN];
char scros[MAXN][2*MAXN];
int n, W, N, num;
void dp(int i, int j)
{
            printf("i=%d j=%d num=%d\n",i, j, num);
    if(i==W&&j==N) {num ++; return;}
    if((cros[i][j+1] != -1) && j+1<=N)
        dp(i,j+1);
    if(cros[i+1][j] != -1 && i+1<=W)
        dp(i+1,j);
}
void input()
{
    scanf("%d",&n);
        while(n --)
        {
            scanf("%d%d", &W, &N);
            getchar();
            for(int i = 1; i <= W; i ++)
            {
                for(int j = 1; j <= N; j ++)
                    {cros[i][j] = 0;}
            }
            for(int i = 1; i <= W; i ++)
            {
                gets(scros[i]);
                int len = strlen(scros[i]);
                for(int j = 0; j < len; j ++)
                {
                    int t = 0;
                    if(scros[i][j] == ' '&& scros[i][j+1] <= '9'&&scros[i][j+1] >= '0')
                    {
                        sscanf(scros[i]+j+1,"%d",&t);
                        cros[i][t] = -1;
                    }
                }
            }
            num = 0;
            //mset(f,0,sizeof(f));
            dp(1,1);
            printf("%d\n",num);
                puts("");
        }
}
int main()
{
    input();
    return 0;
}