Submission #1151682

#	Time	Username	Problem	Language	Result	Execution time	Memory
1151682		Robert_junior	Nautilus (BOI19_nautilus)	C++20	100 / 100	285 ms	812 KiB

nautilus

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define ins insert
#define pb push_back
#define F first
#define S second
const int N = 2e5+100, M = 5e5 + 7;
const int mod = 1e9 + 7;
char b[5001];
int n, m, k;
int get(int i, int j){
    return (i - 1) * 2 * m + j;
}
void solve(){
    cin>>n>>m>>k;
    bitset<510000>base, res, base1, base2;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            char c;
            cin>>c;
            if(c == '.') base[get(i, j)] = 1;
        }
    }
    base1 = base;
    for(int i = 1; i <= k; i++){
        cin>>b[i];
        if(b[i] == 'W'){
            res = (base>>1);
        }
        if(b[i] == 'E'){
            res = (base<<1);
        }
        if(b[i] == 'S'){
            res = (base<<(m * 2));
        }
        if(b[i] == 'N'){
            res = (base>>(m * 2));
        }
        if(b[i] == '?'){
            res = base2;
            res |= (base>>1);
            res |= (base<<1);
            res |= (base>>(m * 2));
            res |= (base<<(m * 2));
        }
        res &= base1;
        base = res;
    }
    int ans = 0;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            ans += base[get(i, j)];
        }
    }
    cout<<ans<<'\n';
}
main(){
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1;
    //cin>>t; 
    for(int i = 1; i <= t; i++){
        //cout<<"Case "<<i<<": ";
        solve();
    }
}

Compilation message (stderr)

nautilus.cpp:59:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   59 | main(){
      | ^~~~

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