Submission #377656

#	Time	Username	Problem	Language	Result	Execution time	Memory
377656		cpp219	Nautilus (BOI19_nautilus)	C++14	100 / 100	330 ms	179308 KiB

nautilus

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 500 + 9;
const ll inf = 1e16 + 7;
char a[N][N];
ll n,m,sz;
string s;

bitset<520> dp[N][5200],sea[N],x;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>n>>m>>sz;
    for (ll i = 1;i <= n;i++)
        for (ll j = 1;j <= m;j++){
            cin>>a[i][j];
            if (a[i][j] == '.') sea[i][j] = dp[i][0][j] = 1;
            else sea[i][j] = dp[i][0][j] = 0;
        }
    cin>>s; s = " " + s;
    for (ll t = 1;t <= sz;t++){
        for (ll i = 1;i <= n;i++){
            if (s[t] == 'N') dp[i][t] = (dp[i + 1][t - 1]);
            if (s[t] == 'S') dp[i][t] = (dp[i - 1][t - 1]);
            if (s[t] == 'E') dp[i][t] = ((dp[i][t - 1] << 1));
            if (s[t] == 'W') dp[i][t] = ((dp[i][t - 1] >> 1));
            if (s[t] == '?')
                dp[i][t] = ((dp[i][t - 1] << 1)|(dp[i][t - 1] >> 1)|(dp[i + 1][t - 1])|(dp[i - 1][t - 1]));
                dp[i][t] &= sea[i]; dp[i][t] &= sea[i];
            //for (ll j = 1;j <= m;j++) cout<<dp[i][t][j]; exit(0);
        }
    }
    ll ans = 0;
    for (ll i = 1;i <= n;i++){
        for (ll j = 1;j <= m;j++){
            if (dp[i][sz][j]) ans++;
            //cout<<dp[i][sz][j];
        }
        //cout<<"\n";
    }

    cout<<ans;
}

Compilation message (stderr)

nautilus.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
nautilus.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      | 
nautilus.cpp: In function 'int main()':
nautilus.cpp:42:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   42 |             if (s[t] == '?')
      |             ^~
nautilus.cpp:44:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   44 |                 dp[i][t] &= sea[i]; dp[i][t] &= sea[i];
      |                 ^~
nautilus.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   25 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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