Submission #1282562

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282562		nhmktu	Nautilus (BOI19_nautilus)	C++17	66 / 100	6 ms	1352 KiB

nautilus

#include <bits/stdc++.h>
#define ll long long
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define ROF(i,a,b) for(int i=a;i>=b;i--)
#define pi pair<int,int>
#define pii pair<int,pi>
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(a) (int) a.size()
#define endl '\n'
#define data "Nautilus"

using namespace std;
const ll linf = 1e18;
const int inf = 1e9;
const int MOD = 1e9 + 7, N = 100;

void add(int &a, int b)
{
    a += b;
    if(a>=MOD)
        a-=MOD;
    if(a<0)
        a += MOD;
}

int modulo(int x)
{
    if(x<=1)
        return 1;
    return (MOD - MOD/x) * modulo(MOD/x) % MOD;
}

int mul(int a, int b)
{
    return (1ll *a%MOD * b%MOD) % MOD;
}
/// N E S W
int dx[] = {+1, 0, -1, 0};
int dy[] = {0, -1, 0, +1};

int row, col, m;
char a[N+3][N+3];
bool dp[N+3][N+3][N+3];
string s;

void inp(void)
{
    cin >> row >> col >> m;
    FOR(i, 1, row)
    {
        FOR(j, 1, col) cin >> a[i][j];
    }
    cin >> s;
    s = ' ' + s;
}

void solve(void)
{
    FOR(i, 1, row)
    {
        FOR(j, 1, col) dp[i][j][0] = (a[i][j] == '.');
    }

    FOR(t, 1, m)
    {
        int p = 4;
        if(s[t] == 'N') p = 0;
        else if(s[t] == 'E') p = 1;
        else if(s[t] == 'S') p = 2;
        else if(s[t] == 'W') p = 3;

        FOR(i, 1, row)
        {
            FOR(j, 1, col)
            {
                if(a[i][j] == '#')
                {
                    dp[i][j][t] = 0;
                    continue;
                }

                if(p != 4) dp[i][j][t] = dp[ i + dx[p] ][ j + dy[p] ][t-1];
                else
                {
                    FOR(k, 0, 3)
                    {
                        int x = i + dx[k];
                        int y = j + dy[k];
                        dp[i][j][t] |= dp[x][y][t-1];
                    }
                }
            }
        }
    }

    int ans = 0;
    FOR(i, 1, row)
    {
        FOR(j, 1, col) ans += dp[i][j][m];
    }
    cout << ans;
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if(fopen(data".inp", "r"))
    {
        freopen(data".inp","r",stdin);
        freopen(data".out","w",stdout);
    }

    inp();
    solve();
    return 0;
}

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen(data".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
nautilus.cpp:115:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         freopen(data".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34