Submission #328789

#	Time	Username	Problem	Language	Result	Execution time	Memory
328789		egas	Nautilus (BOI19_nautilus)	C++14	66 / 100	433 ms	262144 KiB

nautilus

#include <bits/stdc++.h>

using namespace std;

int dp[101][101][5001];

int solve(int r,int c,int pt,vector<string> &grid,string &path) {

    if(r<0 or r>=grid.size() or c<0 or c>=grid[0].size())return 0;

    if(grid[r][c]!='.')return 0;

    if(pt==path.size()) {

        if(dp[r][c][pt]!=-1) {

            return 0;

        }

        dp[r][c][pt]=1;

        return 1;

    }

    if(dp[r][c][pt]!=-1) {

        return 0;

    }

    if(path[pt]=='?') {

        dp[r][c][pt] = solve(r,c-1,pt+1,grid,path) + solve(r,c+1,pt+1,grid,path) + solve(r-1,c,pt+1,grid,path) + solve(r+1,c,pt+1,grid,path);

        return dp[r][c][pt];

    } else {

        if(path[pt]=='W') {

            dp[r][c][pt]= solve(r,c-1,pt+1,grid,path);

            return dp[r][c][pt];

        } else if(path[pt]=='E') {

            dp[r][c][pt] = solve(r,c+1,pt+1,grid,path);

            return dp[r][c][pt];

        } else if(path[pt]=='N') {

            dp[r][c][pt]= solve(r-1,c,pt+1,grid,path);

            return dp[r][c][pt];

        } else if(path[pt]=='S') {

            dp[r][c][pt]= solve(r+1,c,pt+1,grid,path);

            return dp[r][c][pt];

        } else {

            assert(0);

        }

    }

    return 0;

}

int32_t main() {

    ios_base::sync_with_stdio(false);

    cin.tie(0);

    int r;

    cin >> r;

    int c;

    cin >> c;

    int m;

    cin >> m;

    vector<string> grid;

    for(int i = 0 ; i < r ; i++) {

        string temp;

        cin >> temp;

        grid.push_back(temp);

    }

    string path;

    cin >> path;

    memset(dp,-1,sizeof dp);

    int res=0;

    for(int i = 0 ; i < r ; i++) {

        for(int j = 0 ; j < c ; j++) {

            res+=solve(i,j,0,grid,path);

        }

    }

    cout << res << '\n';

    return 0;

}

Compilation message (stderr)

nautilus.cpp: In function 'int solve(int, int, int, std::vector<std::__cxx11::basic_string<char> >&, std::string&)':
nautilus.cpp:9:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     if(r<0 or r>=grid.size() or c<0 or c>=grid[0].size())return 0;
      |               ~^~~~~~~~~~~~~
nautilus.cpp:9:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     if(r<0 or r>=grid.size() or c<0 or c>=grid[0].size())return 0;
      |                                        ~^~~~~~~~~~~~~~~~
nautilus.cpp:13:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     if(pt==path.size()) {
      |        ~~^~~~~~~~~~~~~

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