Submission #730662

#	Time	Username	Problem	Language	Result	Execution time	Memory
730662		gagik_2007	Nautilus (BOI19_nautilus)	C++17	100 / 100	128 ms	972 KiB

nautilus

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cmath>
#include <chrono>
#include <ctime>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <limits>
#include <iomanip>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <functional>
#include <random>
#include <cassert>
#include <bitset>
using namespace std;

typedef long long ll;
typedef long double ld;

#pragma GCC optimize("Ofast")

#define ff first
#define ss second

ll ttt;
const ll INF = 1e18;
const ll MOD = 1e9 + 7;
const ll N = 507;
const ll LG = 21;
ll n, m, k;
char a[N][N];
string s;
bitset<N> dp[N];
bitset<N> lst[N];
bitset<N> b[N];

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> m >> k;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> a[i][j];
			if (a[i][j] == '.') {
				b[i][j] = true;
				dp[i][j] = true;
			}
		}
	}
	cin >> s;
	for (int c = 0; c < s.size(); c++) {
		for (int i = 1; i <= n; i++) {
			lst[i] = dp[i];
			dp[i] = 0;
		}
		for (int i = 1; i <= n; i++) {
			if (s[c] == 'N' || s[c] == '?') {
				dp[i - 1] |= (lst[i] & b[i - 1]);
			}
			if (s[c] == 'E' || s[c] == '?') {
				dp[i] |= ((lst[i] << 1) & b[i]);
			}
			if (s[c] == 'S' || s[c] == '?') {
				dp[i + 1] |= (lst[i] & b[i + 1]);
			}
			if (s[c] == 'W' || s[c] == '?') {
				dp[i] |= ((lst[i] >> 1) & b[i]);
			}
		}
	}
	int cnt = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cnt += dp[i][j];
		}
	}
	cout << cnt << endl;
}

/// ---- - --------  ------ -------- -- - - -
/// Just a reminder. Ubuntu password is I O I
/// ---- - --------  ------ -------- -- - - -

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:59:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |  for (int c = 0; c < s.size(); c++) {
      |                  ~~^~~~~~~~~~

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