Submission #417975

#	Time	Username	Problem	Language	Result	Execution time	Memory
417975		JerryLiu06	Nautilus (BOI19_nautilus)	C++17	100 / 100	283 ms	160332 KiB

nautilus

#include <bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using ld = long double;
using db = double;
using str = string;
 
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
 
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
 
#define mp make_pair
#define f first
#define s second
 
#define sz(x) (int)(x).size()
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define sor(x) sort(all(x))
#define ft front()
#define bk back()
#define pb push_back
#define pf push_front
 
#define lb lower_bound
#define ub upper_bound
 
#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(a,x) for (auto& a: x)
 
const int MOD = 1e9 + 7;
const int MXR = 510;
const int MXM = 5010;
const ll INF = 2e18 + 10; 

int R, C, M; string S; bitset<MXR> DP[MXM][MXR], grid[MXR];

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);

    cin >> R >> C >> M; FOR(i, 1, R + 1) FOR(j, 1, C + 1) {
        char A; cin >> A; if (A == '.') { DP[0][i][j] = 1; grid[i][j] = 1; }
    }
    cin >> S; FOR(i, 1, sz(S) + 1) FOR(j, 1, R + 1) {
        if (S[i - 1] == 'N' || S[i - 1] == '?') DP[i][j] |= DP[i - 1][j + 1];
        if (S[i - 1] == 'S' || S[i - 1] == '?') DP[i][j] |= DP[i - 1][j - 1];

        if (S[i - 1] == 'W' || S[i - 1] == '?') DP[i][j] |= DP[i - 1][j] >> 1, DP[i][j][C + 1] = 0;
        if (S[i - 1] == 'E' || S[i - 1] == '?') DP[i][j] |= DP[i - 1][j] << 1, DP[i][j][0] = 0;

        DP[i][j] &= grid[j];
    }
    int ans = 0; FOR(i, 1, R + 1) ans += DP[M][i].count(); cout << ans;
}

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