Submission #625234

#	Time	Username	Problem	Language	Result	Execution time	Memory
625234		Do_you_copy	Nautilus (BOI19_nautilus)	C++17	100 / 100	180 ms	984 KiB

nautilus

#include <bits/stdc++.h>
//#define int long long
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 501 + 1;
int r, c, m;
string s[maxN];
string t;
bitset <500> a[maxN];
bitset <500> dp[501][2];
void Init(){
    cin >> r >> c >> m;
    for (int i = 0; i < r; ++i){
        cin >> s[i];
        for (int j = 0; j < c; ++j){
            a[i][j] = s[i][j] == '.';
            dp[i][0] = a[i];
        }
    }
    cin >> t;
    for (int k = 1; k <= m; ++k){
        for (int i = 0; i < r; ++i){
            int j = k % 2;
            dp[i][j] = 0;
            if ((t[k - 1] == 'S' || t[k - 1] == '?') && i > 0) dp[i][j] |= dp[i - 1][j ^ 1] & a[i];
            if (t[k - 1] == 'W' || t[k - 1] == '?') dp[i][j] |= (dp[i][j ^ 1] >> 1) & a[i];
            if (t[k - 1] == 'E' || t[k - 1] == '?') dp[i][j] |= (dp[i][j ^ 1] << 1) & a[i];
            if ((t[k - 1] == 'N' || t[k - 1] == '?') && i < r - 1) dp[i][j] |= dp[i + 1][j ^ 1] & a[i];
        }
    }
    int ans = 0;
    for (int i = 0; i < r; ++i){
        ans += dp[i][m % 2].count();
    }
    cout << ans << "\n";
}

#define debu
#define taskname "test"
signed main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        #ifdef debug
        freopen(taskname".out", "w", stdout);
        #endif
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << 1000 * double(clock()) / CLOCKS_PER_SEC;
        #ifndef debug
        cerr << "\nTime elapsed: " << 1000 * double(clock()) / CLOCKS_PER_SEC << "ms\n";
        #endif
    }
}

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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