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  1. #include "cave.h"
  2. #include <vector>
  3. using namespace std;
  4.  
  5. #define MAXN 5003
  6.  
  7. static int N,S[MAXN],D[MAXN];
  8. static bool find[MAXN];
  9. static vector <int> sw;
  10.  
  11. int dfs(int s,int e,int org,int door)
  12. {
  13.     if (s == e) return sw[s];
  14.     int i,m=(s+e)>>1,k;
  15.     for (i=s;i<=m;i++) S[sw[i]] ^= 1;
  16.     k = tryCombination(S);
  17.     if ((org==door) != (k==door)) return dfs(s,m,k,door);
  18.     else return dfs(m+1,e,k,door);
  19. }
  20.  
  21. void exploreCave(int n)
  22. {
  23.     int i,j,k;
  24.     N = n;
  25.     for (i=0;i<N;i++){
  26.         sw.clear();
  27.         for (j=0;j<N;j++) if (!find[j]) sw.push_back(j);
  28.         n = sw.size();
  29.         k = tryCombination(S);
  30.         k = dfs(0,n-1,k,i);
  31.         find[k] = 1; D[k] = i;
  32.         n = tryCombination(S);
  33.         if (n == i) S[k] ^= 1;
  34.     }
  35.     answer(S,D);
  36. }
  37.  
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https://ideone.com/ocX1qz
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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