Submission #881928

#	Time	Username	Problem	Language	Result	Execution time	Memory
881928		Requiem	Nautilus (BOI19_nautilus)	C++17	100 / 100	193 ms	160484 KiB

nautilus

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define MOD 1000000007
#define INF 1e18
#define fi first
#define se second
#define endl "\n"
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define sz(a) ((int)(a).size())
#define pi 3.14159265359
#define TASKNAME ""
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; } 
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; } 
using namespace std; 
typedef pair<int,int> ii; 
typedef pair<int,ii> iii; 
typedef vector<int> vi; 
const int MAXN = 5e2 + 9;
int n,m,k;
char c[MAXN][MAXN];
char dir[MAXN];
bitset<503> dp[5003][MAXN];
bitset<503> sea[MAXN];
main() 
{ 
    fast; 
   if (fopen(TASKNAME".inp","r")){
        freopen(TASKNAME".inp","r",stdin); 
        freopen(TASKNAME".out","w",stdout); 
   } 
   cin>>n>>m>>k;
   for(int i=1;i<=n;i++){
       for(int j=1;j<=m;j++){
           cin>>c[i][j];
           if (c[i][j] == '.') sea[i][j] = 1;
           if (c[i][j] != '#') dp[0][i][j]= 1;
       }
   }
   for(int i=1;i<=k;i++){
       cin>>dir[i];
   }
   int ans = 0;
   for(int t=1;t<=k;t++){
       for(int i=1;i<=n;i++){
           if (dir[t] == 'E') dp[t][i] = (dp[t-1][i] << 1) & sea[i];
           if (dir[t] == 'W') dp[t][i] = (dp[t-1][i] >> 1) & sea[i];
           if (dir[t] == 'S') dp[t][i] = (dp[t-1][i-1]) & sea[i];
           if (dir[t] == 'N') dp[t][i] = (dp[t-1][i+1]) & sea[i];
           if (dir[t] == '?') dp[t][i] = (dp[t-1][i-1] | dp[t-1][i+1] | (dp[t-1][i]<<1) | (dp[t-1][i] >> 1)) & sea[i];
       }
   }
   for(int i=1;i<=n;i++){
       for(int j=1;j<=m;j++){
           ans += dp[k][i][j];   
       }
   }
   cout<<ans<<endl;



} 

Compilation message (stderr)

nautilus.cpp:27:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   27 | main()
      | ^~~~
nautilus.cpp: In function 'int main()':
nautilus.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(TASKNAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(TASKNAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 34 / 34