Submission #414700

#	Time	Username	Problem	Language	Result	Execution time	Memory
414700		juggernaut	Nautilus (BOI19_nautilus)	C++17	66 / 100	1091 ms	972 KiB

nautilus

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
int n,m,q;
bool a[505][505];
bool dp[505][505][2];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>m>>q;
    for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++){
        char ch;
        cin>>ch;
        a[i][j]=(ch=='.');
        dp[i][j][0]=a[i][j];
    }
    bool xr=1;
    string s;
    cin>>s;
    reverse(s.begin(),s.end());
    for(int k=q-1;k>=0;k--){
        char ch=s[k];
        for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            if(a[i][j]){
                dp[i][j][xr]=0;
                if(ch=='N'||ch=='?')dp[i][j][xr]|=dp[i+1][j][xr^1];
                if(ch=='S'||ch=='?')dp[i][j][xr]|=dp[i-1][j][xr^1];
                if(ch=='W'||ch=='?')dp[i][j][xr]|=dp[i][j+1][xr^1];
                if(ch=='E'||ch=='?')dp[i][j][xr]|=dp[i][j-1][xr^1];
            }
        xr^=1;
    }
    int cnt=0;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)cnt+=dp[i][j][xr^1];
    cout<<cnt;
}
/*
5 9 7
...##....
..#.##..#
..#....##
.##...#..
....#....
WS?EE??
*/

Compilation message (stderr)

nautilus.cpp: In function 'void usaco(std::string)':
nautilus.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34