Submission #729801

#	Time	Username	Problem	Language	Result	Execution time	Memory
729801		vjudge1	Nautilus (BOI19_nautilus)	C++14	66 / 100	50 ms	5324 KiB

nautilus

#include <iostream>
#include <cstring>
#include <vector>
#include <queue>
#include <algorithm>
#include <map>
#include <stack>
#include <set>
using namespace std;
const int maxn = 105;
int n, m, sz;
char mat[maxn][maxn];
int dp[maxn][maxn][maxn];
string s;
int di[] = {-1, 1, 0, 0};
int dj[] = {0, 0, -1, 1};
set<pair<int, int> > st;
int rec(int i, int j, int at) {
    if(at == sz) {
        st.insert({i, j});
//        cout << "DA" << endl;
        return 1;
    }
    if(dp[i][j][at] != -1) {
        return dp[i][j][at];
    }
    int result = 0;
    if(s[at] == 'N') {
        if(i - 1 >= 0 and mat[i - 1][j] != '#') {
            result = max(result, rec(i - 1, j, at + 1));
        }
    }
    if(s[at] == 'S') {
        if(i + 1 < n and mat[i + 1][j] != '#') {
            result = max(result, rec(i + 1, j, at + 1));
        }
    }
    if(s[at] == 'W') {
        if(j - 1 >= 0 and mat[i][j - 1] != '#') {
            result = max(result, rec(i, j - 1, at + 1));
        }
    }
    if(s[at] == 'E') {
        if(j + 1 < m and mat[i][j + 1] != '#') {
            result = max(result, rec(i, j + 1, at + 1));
        }
    }
    if(s[at] == '?') {
        for(int k = 0; k < 4; k++) {
            int ti = i + di[k];
            int tj = j + dj[k];
            if(ti >= 0 and tj >= 0 and ti < n and tj < m and mat[ti][tj] != '#') {
                result = max(result, rec(ti, tj, at + 1));
            }
        }
    }
    return  dp[i][j][at] = result;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin >> n >> m >> sz;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            cin >> mat[i][j];
        }
    }
    cin >> s;
    int res = 0;
    memset(dp, -1, sizeof dp);
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            if(mat[i][j] != '#') {
//                res++;
            }
            if(mat[i][j] != '#' and rec(i, j, 0) == 1) {
                
            }
        }
    }
    cout << st.size() << endl;
    return 0;
}
/*
 5 9 7
...##....
..#.##..#
..#....##
.##...#..
....#....
WS?EE??
 
 
 **/

Compilation message (stderr)

nautilus.cpp: In function 'int main()':
nautilus.cpp:68:9: warning: unused variable 'res' [-Wunused-variable]
   68 |     int res = 0;
      |         ^~~

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