Submission #130972

#	Time	Username	Problem	Language	Result	Execution time	Memory
130972		IOrtroiii	Nautilus (BOI19_nautilus)	C++14	100 / 100	223 ms	1064 KiB

nautilus

#include <bits/stdc++.h>

using namespace std;

const int N = 505;
using Val = bitset<N>;

Val org[N];
Val now[N];
Val nxt[N];

int main() {
   ios_base::sync_with_stdio(false);
   int n, m, k;
   cin >> n >> m >> k;
   vector<string> brd(n);
   for (int i = 0; i < n; ++i) {
      cin >> brd[i];
      for (int j = 0; j < m; ++j) {
         if (brd[i][j] == '.') {
            org[i].set(j);
         }
      }
      now[i] = org[i];
   }
   string mvs;
   cin >> mvs;
   for (char c : mvs) {
      for (int i = 0; i < n; ++i) {
         nxt[i] = {};
      }
      if (c == 'N' || c == '?') {
         for (int i = 0; i + 1 < n; ++i) {
            nxt[i] |= now[i + 1];
         }
      }
      if (c == 'E' || c == '?') {
         for (int i = 0; i < n; ++i) {
            nxt[i] |= (now[i] << 1);
         }
      }
      if (c == 'S' || c == '?') {
         for (int i = 1; i < n; ++i) {
            nxt[i] |= now[i - 1];
         }
      }
      if (c == 'W' || c == '?') {
         for (int i = 0; i < n; ++i) {
            nxt[i] |= (now[i] >> 1);
         }
      }
      for (int i = 0; i < n; ++i) {
         now[i] = nxt[i] & org[i];
      }
   }
   int ans = 0;
   for (int i = 0; i < n; ++i) {
      ans += now[i].count();
   }
   cout << ans << "\n";
}

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