Submission #915355

#	Time	Username	Problem	Language	Result	Execution time	Memory
915355		vjudge1	Patkice (COCI20_patkice)	C++17	50 / 50	1 ms	444 KiB

patkice

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define int ll
#define ii pair<int,int>
#define F first
#define S second
#define endl '\n'

const int N = 105;
char a[N][N];

signed main(){
    int r, s;
    cin >> r >> s;
    ii start, target;
    for(int i=0; i<r; ++i){
        for(int j=0; j<s; ++j){
            cin >> a[i][j];
            if(a[i][j] == 'o'){
                start = {i, j};
            }
            if(a[i][j] == 'x'){
                target = {i, j};
            }
        }
    }
    auto dfs = [&](ii cur, auto&& dfs) -> int {
        if(cur == target) return 0;
        if(a[cur.F][cur.S] == '.') return 4e18;

        if(a[cur.F][cur.S] == '<'){
            int tmp = dfs({cur.F, cur.S-1}, dfs);
            if(tmp != 4e18){
                return 1 + tmp;
            }
            return 4e18;
        }

        if(a[cur.F][cur.S] == '>'){
            int tmp = dfs({cur.F, cur.S+1}, dfs);
            if(tmp != 4e18){
                return 1 + tmp;
            }
            return 4e18;
        }

        if(a[cur.F][cur.S] == '^'){
            int tmp = dfs({cur.F-1, cur.S}, dfs);
            if(tmp != 4e18){
                return 1 + tmp;
            }
            return 4e18;
        }

        if(a[cur.F][cur.S] == 'v'){
            int tmp = dfs({cur.F+1, cur.S}, dfs);
            if(tmp != 4e18){
                return 1 + tmp;
            }
            return 4e18;
        }

        return 4e18;
    };

    string aux = "ENSW";
    vector<int> ans(4);
    ans[0] = dfs(make_pair(start.F, start.S+1), dfs);
    ans[1] = dfs(make_pair(start.F-1, start.S), dfs);
    ans[2] = dfs(make_pair(start.F+1, start.S), dfs);
    ans[3] = dfs(make_pair(start.F, start.S-1), dfs);

    int mn = min({ans[0], ans[1], ans[2], ans[3]});
    if(mn == 4e18){
        cout << ":(";
        return 0;
    }
    for(int i=0; i<4; ++i){
        if(ans[i] == mn){
            cout << ":)\n";
            cout << aux[i];
            return 0;
        }
    }
    assert(0);
}

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20