//#pragma GCC optimize("Ofast,O3")
//#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debugger.cpp"
#else
#define debug(...)
#endif
template<class T>
int len(T &a){
return a.size();
}
using ll = long long;
using pii = pair<int,int>;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
string fileio = "";
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll infl = 1e18;
const int maxn = 1e5 + 1;
void solve(){
int k, n, m; cin >> k >> n >> m;
swap(n, m);
vector<string> grid(n);
vector<int> st(k);
for(int i = 0; i < n; i ++){
cin >> grid[i];
for(int j = 0; j < m; j ++){
if(grid[i][j] >= '1' && grid[i][j] <= '9') st[grid[i][j] - '1'] = i * m + j;
}
}
vector memo(n, vector(m, vector(4, pair{-1, -1})));
vector used(n, vector(m, vector(4, false)));
auto find = [&](auto &find, int i, int j, int dir)->pair<int,int>{
if(memo[i][j][dir].ff != -1) return memo[i][j][dir];
if(used[i][j][dir]) return {inf,inf};
used[i][j][dir] = 1;
pair<int,int> &res = memo[i][j][dir];
res = {i, j};
if(grid[i][j] == 'A') dir --;
if(grid[i][j] == 'C') dir ++;
dir = (dir + 4) % 4;
if(dir == 0){
if(i > 0 && grid[i - 1][j] != 'x') res = find(find, i - 1, j, dir);
}else
if(dir == 1){
if(j + 1 < m && grid[i][j + 1] != 'x') res = find(find, i, j + 1, dir);
}else
if(dir == 2){
if(i + 1 < n && grid[i + 1][j] != 'x') res = find(find, i + 1, j, dir);
}else
if(j > 0 && grid[i][j - 1] != 'x') res = find(find, i, j - 1, dir);
return res;
};
vector<vector<int>> g(n * m);
for(int i = 0; i < n; i++){
for(int j = 0; j < m; j ++){
if(grid[i][j] == 'x') continue;
for(int dir = 0; dir < 4; dir ++){
auto [ii, jj] = find(find, i, j, dir);
if((ii == i && j == jj) || ii == inf) continue;
//debug(i, j, dir, ii, jj);
g[i * m + j].push_back(ii * m + jj);
}
}
}
vector<vector<int>> dis(k, vector<int> (n * m, inf));
int vis[n * m];
//debug(dis);
for(int i = 0; i < k; i ++){
queue<int> q; q.push(st[i]);
memset(vis, 0, sizeof(vis));
//debug(i);
vis[st[i]] = 1;
dis[i][st[i]] = 0;
while(!q.empty()){
int t = q.front(); q.pop();
//debug(t, dis[i][t]);
for(auto u : g[t]){
//debug(u);
if(!vis[u]){
vis[u] = 1;
dis[i][u] = dis[i][t] + 1;
q.push(u);
}
}
}
}
int mn = inf;
for(int i = 0; i < n * m; i ++){
mn = min(mn, dis[0][i] + dis[1][i]);
//debug(i, dis[0][i], dis[1][i]);
}
if(mn == inf){
cout << -1;
}else cout << mn;
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
auto start = chrono::high_resolution_clock::now();
#ifndef LOCAL
if(fileio.size()){
freopen((fileio + ".in").c_str(), "r", stdin);
freopen((fileio + ".out").c_str(), "w", stdout);
}
#endif
int testcases = 1;
#ifdef Tests
cin >> testcases;
#endif
while(testcases --){
solve();
if(testcases) cout << '\n';
#ifdef LOCAL
else cout << '\n';
cout << "_________________________" << endl;
#endif
}
#ifdef LOCAL
auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
cout << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
#endif
return 0;
}
Compilation message
robots.cpp: In function 'int main()':
robots.cpp:124:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
124 | auto start = chrono::high_resolution_clock::now();
| ^~~~~
robots.cpp:127:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
127 | freopen((fileio + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
robots.cpp:128:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
128 | freopen((fileio + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
344 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
344 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| 6 |
Correct |
1 ms |
344 KB |
Output is correct |
| 7 |
Correct |
1 ms |
348 KB |
Output is correct |
| 8 |
Correct |
0 ms |
460 KB |
Output is correct |
| 9 |
Correct |
1 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
344 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| 6 |
Correct |
1 ms |
344 KB |
Output is correct |
| 7 |
Correct |
1 ms |
348 KB |
Output is correct |
| 8 |
Correct |
0 ms |
460 KB |
Output is correct |
| 9 |
Correct |
1 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
344 KB |
Output is correct |
| 11 |
Incorrect |
20 ms |
19964 KB |
Output isn't correct |
| 12 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
344 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
344 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| 6 |
Correct |
1 ms |
344 KB |
Output is correct |
| 7 |
Correct |
1 ms |
348 KB |
Output is correct |
| 8 |
Correct |
0 ms |
460 KB |
Output is correct |
| 9 |
Correct |
1 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
344 KB |
Output is correct |
| 11 |
Incorrect |
20 ms |
19964 KB |
Output isn't correct |
| 12 |
Halted |
0 ms |
0 KB |
- |
