Submission #414708

#	Time	Username	Problem	Language	Result	Execution time	Memory
414708		juggernaut	Nautilus (BOI19_nautilus)	C++17	100 / 100	569 ms	1220 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;
const int N=505;
int main(){
    #ifndef IOI2021SG
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    #endif
    cin>>n>>m>>q;
    bitset<2*N*N>valid,dp;
    for(int i=1;i<=n;i++)
    for(int j=1;j<=m;j++){
        char ch;
        cin>>ch;
        if(ch=='.')valid.set(i*N+j,1);
    }
    dp=valid;
    for(int i=1;i<=q;i++){
        char ch;
        cin>>ch;
        if(ch=='N')dp>>=N;
        else if(ch=='S')dp<<=N;
        else if(ch=='W')dp>>=1;
        else if(ch=='E')dp<<=1;
        else dp=((dp<<N)|(dp>>1)|(dp<<1)|(dp>>N));
        dp&=valid;
    }
    cout<<dp.count();
}
/*
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: 34 / 34