Submission #729432

#	Time	Username	Problem	Language	Result	Execution time	Memory
729432		MohammadAghil	Maze (JOI23_ho_t3)	C++17	100 / 100	909 ms	164920 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("Ofast,unroll-loops")
// #pragma GCC target ("avx2")
#define rep(i,l,r) for(int i = (l); i < (r); i++)
#define per(i,r,l) for(int i = (r); i >= (l); i--)
#define all(x) begin(x), end(x)
#define sz(x) (int)size(x)
#define pb push_back
#define ff first
#define ss second
typedef long long ll;
typedef pair<int, int> pp;

void dbg(){
     cerr << endl;
}
template<typename H, typename... T> void dbg(H h, T... t){
     cerr << h << ", ";
     dbg(t...);
}

void IOS(){
     cin.tie(0) -> sync_with_stdio(0);
     #ifndef ONLINE_JUDGE
          // freopen("inp.txt", "r", stdin);
          // freopen("out.txt", "w", stdout);
          #define er(...) cerr << __LINE__ << " <" << #__VA_ARGS__ << ">: ", dbg(__VA_ARGS__)
     #else
          #define er(...) 0
     #endif
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll mod = 1e9 + 7, maxn = 1e5 + 5, maxk = 31, lg = 18, inf = ll(1e18) + 5;

int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1};
int dy2[8] = {0, 1, 1, 1, 0, -1, -1, -1}, dx2[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
int r, c;

int main(){ IOS();
     int n; cin >> r >> c >> n;
     pp st, en; cin >> st.ff >> st.ss >> en.ff >> en.ss;
     st = {st.ff-1, st.ss-1}, en = {en.ff-1, en.ss-1};
     vector<vector<bool>> is(r, vector<bool>(c));
     vector<vector<int>> dist(r, vector<int>(c, -1));
     vector<vector<int>> dist2(r, vector<int>(c, -1));
     rep(i,0,r){
          rep(j,0,c){
               char x; cin >> x;
               is[i][j] = x == '.';
          }
     }
     vector<pp> cand{st};
     dist[st.ff][st.ss] = 0;
     while(sz(cand)){
          int D = dist[cand.back().ff][cand.back().ss];
          vector<pp> q;
          while(sz(cand)){
               q.pb(cand.back());
               auto[a, b] = cand.back(); cand.pop_back();
               dist2[a][b] = 0;
               rep(d,0,4){
                    int x = a + dx[d], y = b + dy[d];
                    if(x < 0 || x >= r || y < 0 || y >= c || !is[x][y] || dist[x][y] + 1) continue; 
                    dist[x][y] = D;
                    cand.pb({x, y});
               }
          }
          int l = 0;
          while(l < sz(q)){
               auto[a, b] = q[l++];
               if(dist[a][b] == -1){
                    cand.pb({a, b});
                    dist[a][b] = D + 1;
               }
               if(dist2[a][b] < n - 1){
                    rep(d,0,8){
                         int x = a + dx2[d], y = b + dy2[d];
                         if(x < 0 || x >= r || y < 0 || y >= c || dist[x][y] + 1 || dist2[x][y] + 1) continue;
                         dist2[x][y] = dist2[a][b] + 1;
                         q.pb({x, y});
                    }    
               } else if(dist2[a][b] == n-1){
                    rep(d,0,4){
                         int x = a + dx[d], y = b + dy[d];
                         if(x < 0 || x >= r || y < 0 || y >= c || dist[x][y] + 1 || dist2[x][y] + 1) continue;
                         dist2[x][y] = dist2[a][b] + 1;
                         q.pb({x, y});
                    }
               }
          }
     }
     cout << dist[en.ff][en.ss] << '\n';
     return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 19 / 19
• Subtask 3: 16 / 16
• Subtask 4: 19 / 19
• Subtask 5: 5 / 5
• Subtask 6: 19 / 19
• Subtask 7: 8 / 8
• Subtask 8: 6 / 6