#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define ALL(v) (v).begin(), (v).end()
#define MASK(i) (1LL << (i))
#define GETBIT(mask, i) (((mask) >> (i)) & 1)
// mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng(1);
ll rngesus(ll l, ll r){return ((ull) rng()) % (r - l + 1) + l;}
ll max(ll a, ll b){return (a > b) ? a : b;}
ll min(ll a, ll b){return (a < b) ? a : b;}
ll LASTBIT(ll mask){return mask & (-mask);}
ll pop_cnt(ll mask){return __builtin_popcountll(mask);}
ll ctz(ll mask){return __builtin_ctzll(mask);}
ll clz(ll mask){return __builtin_clzll(mask);}
ll logOf(ll mask){return 63 - clz(mask);}
template <class T1, class T2>
bool minimize(T1 &a, T2 b){
if (a > b){a = b; return true;}
return false;
}
template <class T1, class T2>
bool maximize(T1 &a, T2 b){
if (a < b){a = b; return true;}
return false;
}
template <class T>
void printArr(T& a, string separator = " ", string finish = "\n", ostream& out = cout){
for(auto i: a) out << i << separator;
out << finish;
}
template <class T>
void remove_dup(vector<T> &a){
sort(ALL(a));
a.resize(unique(ALL(a)) - a.begin());
}
int dx[] = {1, 0, -1, 0};
int dy[] = {0, 1, 0, -1};
const int N = 501, K = 2, INF = 1e9 + 69;
enum GridObj{none=0, obstacle=1, anti_clockwise=2, clockwise=3};
int n, w, h;
int dp[K][K][N][N];
int dis[N][N][4];
bool visited[N][N][4];
GridObj grid[N][N];
pair<int, int> pos[9];
vector<array<int, 3>> q[N * N];
void dijkstra(int l, int r){
memset(dis, 63, sizeof dis);
int cnt = 0;
if (l == r){
for(int i = 1; i<=w; ++i) for(int j = 1;j <=h; ++j) if (dp[l][r][i][j] < INF) {
for(int x = 0; x < 4; ++x){
dis[i][j][x] = dp[l][r][i][j];
q[dp[l][r][i][j]].push_back({{i, j, x}});
cnt++;
}
}
}
for(int distance = 0; cnt > 0; ++distance){
while(q[distance].size()){
array<int, 3> u = q[distance].back(); q[distance].pop_back();
cnt--;
if (visited[u[0]][u[1]][u[2]]) continue;
visited[u[0]][u[1]][u[2]] = true;
array<int, 3> v = {{u[0] + dx[u[2]], u[1]+ dy[u[2]], u[2]}};
if (grid[v[0]][v[1]] == anti_clockwise) v[2] = (v[2] + 1) % 4;
else if (grid[v[0]][v[1]] == clockwise) v[2] = (v[2] + 3) % 4;
if (grid[v[0]][v[1]] == obstacle){
minimize(dp[l][r][v[0]][v[1]], distance + 1);
for(int x = 0; x < 4; ++x){
array<int, 3> v = {{u[0] + dx[x], u[1] + dy[x], x}};
if (grid[v[0]][v[1]] != obstacle && minimize(dis[v[0]][v[1]][v[2]], distance + 1)) {
q[distance + 1].push_back(v);
cnt++;
}
}
}
else {
if (minimize(dis[v[0]][v[1]][v[2]], distance)) {
q[distance].push_back(v);
cnt++;
}
}
}
}
}
int main(void){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n >> w >> h;
swap(w, h);
if (n == 1){
cout << 0 << "\n";
return 0;
}
if (n > 2) return -1;
for(int i = 0; i<=w+1; ++i)
for(int j = 0; j<=h+1; ++j) grid[i][j] = obstacle;
for(int i = 0; i<w; ++i){
string s; cin >> s;
for(int j = 0; j<h; ++j){
if (s[j] == '.') grid[i+1][j+1]=none;
else if (s[j] == 'x') grid[i+1][j+1] = obstacle;
else if (s[j] == 'A') grid[i+1][j+1] = anti_clockwise;
else if (s[j] == 'C') grid[i+1][j+1] = clockwise;
else pos[s[j] - '0' - 1] = {i + 1, j + 1};
}
}
memset(dp, 63, sizeof dp);
for(int i = 0; i<n; ++i){
dp[i][i][pos[i].first][pos[i].second] = 0;
}
for(int i = 0; i<n; ++i){
dijkstra(i, i);
}
int ans = INF;
for(int i = 1; i<=w; ++i) for(int j = 1; j<=w; ++j)
minimize(ans, dp[0][0][i][j] + dp[1][1][i][j]);
if (ans == INF) ans = -1;
cout << ans << "\n";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
15964 KB |
Output is correct |
| 2 |
Correct |
3 ms |
15964 KB |
Output is correct |
| 3 |
Incorrect |
3 ms |
15964 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
15964 KB |
Output is correct |
| 2 |
Correct |
3 ms |
15964 KB |
Output is correct |
| 3 |
Incorrect |
3 ms |
15964 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
15964 KB |
Output is correct |
| 2 |
Correct |
3 ms |
15964 KB |
Output is correct |
| 3 |
Incorrect |
3 ms |
15964 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
15964 KB |
Output is correct |
| 2 |
Correct |
3 ms |
15964 KB |
Output is correct |
| 3 |
Incorrect |
3 ms |
15964 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
