poj1067-取石子游戏-wythoff博弈

打表找规律失败，搜了一下原来是wythoff博弈

 1 /*--------------------------------------------------------------------------------------*/
 2
 3 #include <algorithm>
 4 #include <iostream>
 5 #include <cstring>
 6 #include <ctype.h>
 7 #include <cstdlib>
 8 #include <cstdio>
 9 #include <vector>
10 #include <string>
11 #include <queue>
12 #include <stack>
13 #include <cmath>
14 #include <set>
15 #include <map>
16
17 //debug function for a N*M array
18 #define debug_map(N,M,G) printf("\n");for(int i=0;i<(N);i++)19 {for(int j=0;j<(M);j++){20 printf("%d",G[i][j]);}printf("\n");}
21 //debug function for int,float,double,etc.
22 #define debug_var(X) cout<<#X"="<<X<<endl;
23 #define LL long long
24 const int INF = 0x3f3f3f3f;
25 const LL LLINF = 0x3f3f3f3f3f3f3f3f;
26 const double eps = 1e-8;
27 /*--------------------------------------------------------------------------------------*/
28 using namespace std;
29
30 int N,M,T;
31 int mem[1000][1000] = {0};
32 const double q = (1+sqrt(5.0)) / 2.0;
33
34 void display(int x)
35 {
36     if(x==0) return ;
37     display(x>>1);
38     putchar((x&1) + ‘0‘);
39 }
40
41 int sg(int a,int b)
42 {
43     if(mem[a][b] != -1) return mem[a][b];
44     if(a == 0 && b == 0)return 0;
45     set<int> st ;
46     for(int i=1;i<=a;i++)
47     {
48         st.insert(sg(a-i,b));
49     }
50     for(int i=1;i<=b;i++)
51     {
52         st.insert(sg(a,b-i));
53     }
54     for(int i=1;i<=min(a,b);i++)
55     {
56         st.insert(sg(a-i,b-i));
57     }
58     int g = 0;
59     while(st.find(g) != st.end()) g++;
60     return mem[a][b] = g;
61 }
62
63 int Wythoff(int a,int b)
64 {
65     if( a > b) swap(a,b);
66     int k = b - a;
67     if(a == (int)(k*q)) return 0;
68     else return 1;
69 }
70
71 int main()
72 {
73     int a,b;
74     while(~scanf("%d%d",&a,&b))
75     {
76         printf("%d\n",Wythoff(a,b));
77     }
78 }