Submission #659096

#	Time	Username	Problem	Language	Result	Execution time	Memory
659096		Soul234	Nautilus (BOI19_nautilus)	C++14	100 / 100	136 ms	716 KiB

nautilus

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

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"
#define fi first
#define se second

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
using db = long double;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a=b,1 : 0; }
tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a=b,1 : 0; }

const int MOD = 1e9 + 7;
const ll INF = 1e18;

const int MX = 505;

int R, C, M;

bitset<MX> grid[MX];
str sgn;

bitset<MX> vis[2][MX];

void solve() {
    cin >> R >> C >> M;
    F0R(i, R) {
        str s;
        cin >> s;
        grid[i] = bitset<MX>(s, 0, sz(s), '#', '.');
        vis[1][i] = grid[i];

    }
    cin >> sgn;
    int ans = 0;
    F0R(step, sz(sgn)) {
        int cur = step&1, pre = cur^1;
        F0R(i, R) vis[cur][i].reset();
        F0R(i, R) {
            if(sgn[step] == 'N' || sgn[step] == '?') {
                if(i+1<R) {
                    vis[cur][i] |= vis[pre][i+1] & grid[i];
                }
            }
            if(sgn[step] == 'E' || sgn[step] == '?') {
                vis[cur][i] |= (vis[pre][i]>>1) & grid[i];
            }
            if(sgn[step] == 'W' || sgn[step] == '?') {
                vis[cur][i] |= (vis[pre][i]<<1) & grid[i];
            }
            if(sgn[step] == 'S' || sgn[step] == '?') {
                if(i > 0) vis[cur][i] |= (vis[pre][i-1]) & grid[i];
            }
        }
        if(step == sz(sgn)-1) {
            F0R(i, R) ans += vis[cur][i].count();
        }
    }
    cout << ans << nl;

}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

nautilus.cpp: In function 'void setIO(std::string)':
nautilus.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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