Submission #1214789

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214789		spetr	Toy (CEOI24_toy)	C++20	73 / 100	958 ms	1114112 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define ll long long
const ll mmod = 998244353;  
#define vl vector<long long>
#define vll vector<vector<long long>>


ll intersect(ll l1, ll r1, ll l2, ll r2){
    ll c =0;
    return max(c, (min(r1,r2) - max(l1,l2) + 1));
}

vector<vector<bool>> visited;
ll w,h,k,l;
vector<string> graf;
vll leva;
vll prava;
vll up;
vll down;

void dfs(ll y, ll x){
    visited[y][x] = true;
    vll dirs = {{1,0},{-1,0},{0,1},{0,-1}};

    if (graf[y][x] == '*'){
        cout << "YES";
        exit(0);
    }
    for (int i = 0; i < 4; i++){
        ll nx, ny;
        nx = x + dirs[i][0];
        ny = y + dirs[i][1];

        if (nx >= 0 && ny >= 0 && nx < w && ny < h && graf[ny][nx] != 'X'){
            if (visited[ny][nx] == false){
                

                if (intersect(x - prava[y][x], x + leva[y][x], nx - prava[ny][nx], nx + leva[ny][nx]) >= k){
                    if (intersect(y - down[y][x], y + up[y][x], ny - down[ny][nx], ny + up[ny][nx]) >= l){
                        visited[ny][nx] = true;
                        dfs(ny, nx);
                    }
                }

            }
        }
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    
    cin >> w >> h >> k >> l;

    ll kx, ky, lx, ly;
    cin >> kx >> ky >> lx >> ly; //k-horiznot a l-vertikal
    for (ll i = 0; i < h; i++){
        string radek;
        cin >> radek;
        graf.push_back(radek);
    }

    for (ll i = 0; i < h; i++){
        vector<bool> radek;
        for (ll j = 0; j < w; j++){
            radek.push_back(false);
        }
        visited.push_back(radek);
    }

    // Kontrola, že se vejdou
    for (ll i = 0; i < h; i++){
        vl radek;
        for (ll j = 0; j < w; j++){
            radek.push_back(0);

        }
        leva.push_back(radek);
        prava.push_back(radek);
        up.push_back(radek);
        down.push_back(radek);

    }
   
    for (ll i = 0; i < w; i++){
        ll aktual1, aktual2;
        aktual1 = 0; aktual2 = 0;
        for (ll j = 0; j < h; j++){
            if (graf[j][i] != 'X'){
                down[j][i] = aktual1;
                aktual1++;
            }
            else{
                aktual1 = 0;
            }

        }
        for (ll j = h-1; j >= 0; j--){
            if (graf[j][i] != 'X'){
                up[j][i] = aktual2;
                aktual2++;
            }
            else{
                aktual2 = 0;
            }
        }
    }
    
    for (ll i = 0; i < h; i++){
        ll aktual1 = 0; ll aktual2 = 0;
        for (ll j = 0; j < w; j++){
            if (graf[i][j] != 'X'){
                prava[i][j] = aktual1;
                aktual1++;
            }
            else{
                aktual1 = 0;
            }
        }
        for (ll j = w-1; j >= 0; j--){
            if (graf[i][j] != 'X'){
                leva[i][j] = aktual2;
                aktual2++;
            }
            else{
                aktual2 = 0;
            }
        }
    }

    dfs(ky, lx);


    cout << "NO";
    return 0;
}

• Subtask 0: 0 / 0
• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 9 / 9
• Subtask 4: 29 / 29
• Subtask 5: 0 / 27