Submission #530369

#	Time	Username	Problem	Language	Result	Execution time	Memory
530369		c28dnv9q3	Nautilus (BOI19_nautilus)	C++17	66 / 100	494 ms	262148 KiB

nautilus

#include <iostream>

using namespace std;

const int MAX_GRID = 505, MAX_M = 5005;

int r, c, m;
bool grid[MAX_GRID][MAX_GRID], visited[MAX_GRID][MAX_GRID][MAX_M], position[MAX_GRID][MAX_GRID];
string input;

void solve(int x, int y, int i) {
	if (x < 0 || x >= c || y < 0 || y >= r || !grid[y][x] || visited[y][x][i]) {
		return;
	}
	visited[y][x][i] = true;
	if (i == input.length()) {
		position[y][x] = true;
		return;
	}

	switch (input[i]) {
		case 'N':
			solve(x, y - 1, i + 1);
			break;
		case 'E':
			solve(x + 1, y, i + 1);
			break;
		case 'S':
			solve(x, y + 1, i + 1);
			break;
		case 'W':
			solve(x - 1, y, i + 1);
			break;
		case '?':
			solve(x, y - 1, i + 1);
			solve(x + 1, y, i + 1);
			solve(x, y + 1, i + 1);
			solve(x - 1, y, i + 1);
			break;
	}
}

int main() {
	cin >> r >> c >> m;

	for (int i = 0; i < r; ++i) {
		string s;
		cin >> s;
		for (int j = 0; j < c; ++j) {
			grid[i][j] = (s[j] == '.');
		}
	}

	cin >> input;

	for (int i = 0; i < r; ++i) {
		for (int j = 0; j < c; ++j) {
			solve(j, i, 0);
		}
	}

	/* bool dp[MAX_GRID][MAX_GRID][MAX_M];
	for (int i = 0; i < r; ++i) {
		for (int j = 0; j < c; ++j) {
			for (int pos = 0; pos < input.length(); ++pos) {
				if (!grid[j][i]) {
					continue;
				}
				if (pos == input.length()) {
					position[j][i] = true;
					continue;
				}

				switch (input[pos]) {
					case 'N':
						solve(i, j - 1, pos + 1);
						break;
					case 'E':
						solve(i + 1, j, pos + 1);
						break;
					case 'S':
						solve(i, j + 1, pos + 1);
						break;
					case 'W':
						solve(i - 1, j, pos + 1);
						break;
					case '?':
						solve(i, j - 1, pos + 1);
						solve(i + 1, j, pos + 1);
						solve(i, j + 1, pos + 1);
						solve(i - 1, j, pos + 1);
						break;
				}
			}
		}
	} */

	int result = 0;
	for (int i = 0; i < r; ++i) {
		for (int j = 0; j < c; ++j) {
			result += position[i][j];
		}
	}
	cout << result;
}

Compilation message (stderr)

nautilus.cpp: In function 'void solve(int, int, int)':
nautilus.cpp:16:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |  if (i == input.length()) {
      |      ~~^~~~~~~~~~~~~~~~~

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