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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long 
  4. #define MAX 25
  5. #define N 1000000007
  6. #define pb push_back
  7. #define MIN 5005
  8. #define imax 2000000200
  9. #define llmax 1000000002000000000ll
  10. #define PI 3.141592653589793
  11. #define eps 1e-9
  12. #define F first
  13. #define S second
  14. #define vi vector<int>
  15. #define vl vector<ll>
  16.  
  17. ll a[MAX][MAX];
  18. string s,p;
  19. ll n;
  20. ll cnt[20][20][40][40];
  21. ll marked[20][20][40][40];
  22.  
  23. void dfs(ll x, ll y,ll cnt2, ll cnt3){
  24.     if(marked[x][y][cnt2][cnt3]==1)
  25.     return;
  26.     marked[x][y][cnt2][cnt3]=1;
  27. 	if(x>n || y>n ){
  28. 		return ;
  29. 	}
  30. 	if(a[x][y]==2){
  31. 	    cnt[x][y][cnt2+1][cnt3]=1;
  32. 		dfs(x+1,y,cnt2+1,cnt3);
  33. 		dfs(x,y+1,cnt2+1,cnt3);
  34. 	}
  35. 	else if(a[x][y]==3){
  36. 	    cnt[x][y][cnt2][cnt3+1]=1;
  37. 		dfs(x+1,y,cnt2,cnt3+1);
  38. 		dfs(x,y+1,cnt2,cnt3+1);
  39. 	}
  40. 	else{
  41. 	    cnt[x][y][cnt2][cnt3]=1;
  42. 	    dfs(x+1,y,cnt2,cnt3);
  43. 		dfs(x,y+1,cnt2,cnt3);
  44. 	}
  45. }
  46.  
  47. int main()
  48. {
  49.     ios_base::sync_with_stdio(false);
  50.     ll i,j,k,l,m,x,y,r,t;
  51.     cin>>n;
  52.     for(i=1;i<=n;i++){
  53.     	for(j=1;j<=n;j++){
  54.     		cin>>a[i][j];
  55.     	}
  56.     }
  57.  
  58.     dfs(1,1,0,0);
  59.  
  60.     cin>>m;
  61.     while(m--){
  62.         cin>>x>>y;
  63.         if(cnt[n][n][x][y]==1){
  64.             cout<<"YES"<<endl;
  65.         }
  66.         else{
  67.             cout<<"NO"<<endl;
  68.         }
  69.     }
  70.     return 0;
  71. }
Runtime error #stdin #stdout 0s 13472KB
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https://ideone.com/RGqE5m
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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