Submission #1094377

#TimeUsernameProblemLanguageResultExecution timeMemory
1094377stefanopulosMaze (JOI23_ho_t3)C++17
100 / 100
641 ms175952 KiB
#include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #include <bits/stdc++.h> using namespace std; using namespace __gnu_pbds; typedef long long ll; typedef long double ldb; typedef pair<int,int> pii; typedef pair<ll,ll> pll; typedef pair<ldb,ldb> pdd; #define ff(i,a,b) for(int i = a; i <= b; i++) #define fb(i,b,a) for(int i = b; i >= a; i--) #define trav(a,x) for(auto& a : x) #define sz(a) (int)(a).size() #define fi first #define se second #define pb push_back #define lb lower_bound #define ub upper_bound #define all(a) a.begin(), a.end() #define rall(a) a.rbegin(), a.rend() mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; // os.order_of_key(k) the number of elements in the os less than k // *os.find_by_order(k) print the k-th smallest number in os(0-based) const int mod = 1000000007; const int inf = 1e9 + 5; const int mxN = 200005; const int dx[] = {1, 0, -1, 0}; const int dy[] = {0, 1, 0, -1}; int n, m, k; int sX, sY; int gX, gY; int main(){ cin.tie(0)->sync_with_stdio(0); cin >> n >> m >> k >> sX >> sY >> gX >> gY; vector<string> s(n + 1); ff(i,1,n)cin >> s[i], s[i] = ' ' + s[i]; vector<vector<bool>> used(n + 1, vector<bool>(m + 1)); ff(i,1,n)ff(j,1,m)used[i][j] = 0; vector<vector<pii>> cale(n + 1, vector<pii>(m + 1)); int cur = 0; queue<pii> que; que.push({sX, sY}); while(1){ vector<pii> A; while(sz(que)){ auto [x, y] = que.front(); que.pop(); A.pb({x, y}); ff(i,0,3){ int nwx = x + dx[i]; int nwy = y + dy[i]; if(nwx >= 1 && nwx <= n && nwy >= 1 && nwy <= m && s[nwx][nwy] == '.'){ if(!used[nwx][nwy]){ used[nwx][nwy] = 1; que.push({nwx, nwy}); } } } } vector<pii> vec; for(auto [x, y] : A){ if(x == gX && y == gY){ cout << cur << '\n'; return 0; } ff(i,0,3){ int nwx = x + dx[i]; int nwy = y + dy[i]; if(nwx >= 1 && nwx <= n && nwy >= 1 && nwy <= m && s[nwx][nwy] == '#'){ if(!used[nwx][nwy]){ que.push({nwx, nwy}); cale[nwx][nwy] = {nwx, nwy}; used[nwx][nwy] = 1; } } } } queue<pii> temp; while(sz(que)){ auto [x, y] = que.front(); que.pop(); temp.push({x, y}); ff(i,0,3){ int nwx = x + dx[i]; int nwy = y + dy[i]; if(nwx >= 1 && nwx <= n && nwy >= 1 && nwy <= m){ if(!used[nwx][nwy] && abs(nwx - cale[x][y].fi) < k && abs(nwy - cale[x][y].se) < k){ used[nwx][nwy] = 1; cale[nwx][nwy] = cale[x][y]; que.push({nwx, nwy}); } } } } swap(que, temp); cur += 1; } return 0; } /* 2 4 2 1 1 2 4 .### ###. 6 6 1 1 6 6 1 ..#.#. ##.### ####.# ...### ##.##. .#.### 6 7 6 6 4 3 1 ..#.#.# ##.##.. .###### #..#.#. .###### ..#.##. 1 15 1 1 15 1 1 ............... // probati bojenje sahovski */
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