Submission #1072656

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072656		kh0i	Nautilus (BOI19_nautilus)	C++17	100 / 100	197 ms	1104 KiB

nautilus

#include "bits/stdc++.h"
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

using ll = long long;
using pii = pair<int, int>;

#define F first
#define S second
#define sz(x) (int)((x).size())
#define all(x) (x).begin(), (x).end()

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll get_rand(ll l, ll r) {
    assert(l <= r);
    return uniform_int_distribution<ll> (l, r)(rng);
}

const int N = 503;

int n, m, k;
char c[N][N];
bitset<N> f[N], g[N], grid[N];
string s;

void solve(){
    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] == '.')
                grid[i][j] = 1;
        }
        f[i] = grid[i];
    }

    cin >> s;
    for(char mv : s){
        for(int i = 1; i <= n; ++i)
            g[i] = 0;
        if(mv == '?' or mv == 'N'){
            for(int i = 1; i < n; ++i)
                g[i] |= f[i + 1];
        }
        if(mv == '?' or mv == 'S'){
            for(int i = 2; i <= n; ++i)
                g[i] |= f[i - 1];
        }
        if(mv == '?' or mv == 'W'){
            for(int i = 1; i <= n; ++i)
                g[i] |= f[i] >> 1;
        }
        if(mv == '?' or mv == 'E'){
            for(int i = 1; i <= n; ++i)
                g[i] |= f[i] << 1;
        }

        for(int i = 1; i <= n; ++i)
            f[i] = (g[i] & grid[i]);
    }

    int res = 0;
    for(int i = 1; i <= n; ++i)
        res += f[i].count();

    cout << res;
}

int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    #define task "troll"
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int test = 1;
//    cin >> test;
    for(int i = 1; i <= test; ++i){
//        cout << "Case #" << i << ": ";
        solve();
    }
    #ifdef LOCAL
        cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    #endif
    return 0;
}

Compilation message (stderr)

nautilus.cpp: In function 'int32_t main()':
nautilus.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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