Submission #396196

#	Time	Username	Problem	Language	Result	Execution time	Memory
396196		MrRobot_28	Patkice II (COCI21_patkice2)	C++17	110 / 110	1274 ms	47144 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define sz(a) (int)a.size()
#define ll long long
const int N = 1e7;
const int T = 20;
vector <int> dx = {-1, 0, 1, 0};
vector <int> dy = {0, -1, 0, 1};
vector <char> p = {'^', '<', 'v', '>'};
signed main()
{
  //  ifstream cin("input1.txt.4c");
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin >> n >> m;
    char A[n][m];
    int stx, sty;
    int endx, endy;
    for(int i = 0; i < n; ++i)
    {
        for(int j = 0; j < m; j++)
        {
            cin >> A[i][j];
            if(A[i][j] == 'o')
            {
                stx = i;
                sty = j;
            }
            if(A[i][j] == 'x')
            {
                endx = i;
                endy = j;
            }
        }
    }
    vector <vector <int> > d(n, vector <int> (m, 1e9));
    vector <vector <int> > pred(n, vector <int> (m, -1));
    d[stx][sty] = 0;
    priority_queue <pair <int, pair <int, int> > > q;
    q.push({0, {stx, sty}});
    while(sz(q) != 0)
    {
        pair <int, int> t = q.top().Y;
        int d1 = q.top().X;
        q.pop();
        if(d1 != -d[t.X][t.Y])
        {
            continue;
        }
        int x = t.X;
        int y = t.Y;
        for(int t = 0; t < 4; t++)
        {
            int d_new = d[x][y] + (p[t] != A[x][y] && A[x][y] != 'o');
            int x1 = dx[t] + x;
            int y1 = dy[t] + y;
            if(x1 >= 0 && x1 < n && y1 >= 0 && y1 < m && d[x1][y1] > d_new)
            {
                d[x1][y1] = d_new;
                pred[x1][y1] = t;
                q.push({-d_new, {x1, y1}});
            }
        }
    }
    cout << d[endx][endy] << "\n";
    pair <int, int> st = {endx, endy};
    while(st != make_pair(stx, sty))
    {
        int k = pred[st.X][st.Y];
        pair <int, int> st_new = {st.X - dx[k], st.Y - dy[k]};
        if(st_new == make_pair(stx, sty))
        {
            break;
        }
        A[st_new.X][st_new.Y] = p[k];
        st = st_new;
    }
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
        {
            cout << A[i][j];
        }
        cout << "\n";
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:69:25: warning: 'endy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   69 |     cout << d[endx][endy] << "\n";
      |                         ^
Main.cpp:69:19: warning: 'endx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   69 |     cout << d[endx][endy] << "\n";
      |                   ^

• Subtask 1: 30 / 30
• Subtask 2: 80 / 80