Submission #394357

#	Time	Username	Problem	Language	Result	Execution time	Memory
394357		vishesh312	Nautilus (BOI19_nautilus)	C++17	100 / 100	347 ms	808 KiB

nautilus

#include "bits/stdc++.h"
using namespace std;
/*
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using ordered_set = tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>;
*/

#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sz(x) (int)(x).size()

using ll = long long;
const int mod = 1e9+7;

void solve(int tc) {
    int r, c, m;
    cin >> r >> c >> m;
    const int mxRC = 500 * 500;
    bitset<mxRC> cur, can;
    for (int i = 0; i < r; ++i) {
        for (int j = 0; j < c; ++j) {
            char x;
            cin >> x;
            can[i*c+j] = cur[i*c+j] = (x == '.');
        }
    }
    bitset<mxRC> lastcol, firstcol;
    for (int i = 0; i < r; ++i) {
        for (int j = 0; j < c; ++j) {
            firstcol[i*c+j] = j != 0;
            lastcol[i*c+j] = j != c-1;
        }
    }
    string s;
    cin >> s;
    for (char x : s) {
        bitset<mxRC> prev = cur;
        cur = 0;
        if (x == 'S' or x == '?') cur |= (prev << c) & can;
        if (x == 'N' or x == '?') cur |= (prev >> c) & can;
        if (x == 'E' or x == '?') cur |= (prev << 1) & can & firstcol;
        if (x == 'W' or x == '?') cur |= (prev >> 1) & can & lastcol;
    }
    cout << cur.count() << '\n';
}

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    int tc = 1;
    //cin >> tc;
    for (int i = 1; i <= tc; ++i) solve(i);
    return 0;
}

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