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| #include <bits/stdc++.h>
#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
using namespace std;
struct PairHash {inline std::size_t operator()(const std::pair<int, int> &v) const { return v.first * 31 + v.second; }};
#define Code ios_base::sync_with_stdio(false);
#define By ios::sync_with_stdio(0);
#define Sumfi cout.tie(NULL);
using ll = long long;
using ld = long double;
using ull = unsigned long long;
const ld PI = 3.14159265358979323846;
const ll INF = 1e18;
const ld EPS = 1e-9;
const ll MAX_N = 202020;
const ll mod = 1e9 + 7;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef array<ll,3> all3;
typedef array<ll,5> all5;
typedef vector<all3> vall3;
typedef vector<all5> vall5;
typedef vector<ld> vld;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<int> vi;
typedef pair<string, string> pss;
typedef vector<pss> vpss;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef unordered_set<ll> usll;
typedef unordered_set<pll, PairHash> uspll;
typedef unordered_map<ll, ll> umll;
typedef unordered_map<pll, ll, PairHash> umpll;
#define rep(i,m,n) for(ll i=m;i<n;i++)
#define rrep(i,m,n) for(ll i=n;i>=m;i--)
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define ASCEND(a) iota(all(a),0)
#define sz(x) ll((x).size())
#define pyes cout<<"YES\n";
#define pno cout<<"NO\n";
#define pneg1 cout<<"-1\n";
#define ppossible cout<<"Possible\n";
#define pimpossible cout<<"Impossible\n";
#define CASE(x) cout<<"Case #"<<x<<": ";
template <typename T>
void print(T &&t) { cout << t << "\n"; }
template<typename T>
void printv(vector<T>v){ll n=v.size();rep(i,0,n)cout<<v[i]<<" ";cout<<"\n";}
void fileIO() {freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);}
void hackerCupIO() {freopen("/Users/summerflower/Downloads/second_second_friend_input.txt", "r", stdin); freopen("/Users/summerflower/Downloads/solution.txt","w",stdout);}
template<typename T>
void readv(vector<T>& v){rep(i,0,sz(v)) cin>>v[i];}
void readvpll(vpll& A) {rep(i,0,sz(A)) cin>>A[i].first>>A[i].second;}
void readvall3(vall3& A) {rep(i,0,sz(A)) cin>>A[i][0]>>A[i][1]>>A[i][2];}
void readvvll(vvll& A) {rep(i,0,sz(A)) readv(A[i]);}
ll __gcd(ll x, ll y) { return !y ? x : __gcd(y, x % y); }
ll __lcm(ll x, ll y) { return x / __gcd(x,y) * y; }
ll modpow(ll n, ll x, ll MOD = mod) { if(!x) return 1; ll res = modpow(n,x>>1,MOD); res = (res * res) % MOD; if(x&1) res = (res * n) % MOD; return res; }
vs solve(vs A) {
ll n = sz(A), m = sz(A[0]);
ll cnt = 0;
rep(i,0,n) rep(j,0,m) cnt += A[i][j] == '^';
if(!cnt) return A;
if(n == 1 or m == 1) return {};
vs res = A;
rep(i,0,n) rep(j,0,m) if(res[i][j] == '.') res[i][j] = '^';
queue<pll> q;
ll dy[4]={-1,0,1,0}, dx[4] = {0,1,0,-1};
auto check = [&](ll y, ll x) {
ll cnt = 0;
rep(i,0,4) {
ll ny = y + dy[i], nx = x + dx[i];
if(0 <= ny and ny < n and 0 <= nx and nx < m and res[ny][nx] == '^') cnt++;
}
return cnt;
};
vvll inc(n,vll(m));
rep(y,0,n) {
rep(x,0,m) {
if(res[y][x] != '^') continue;
ll adj = check(y,x);
if(adj < 2 and inc[y][x] == 0) {
q.push({y,x});
inc[y][x] = 1;
}
}
}
while(!q.empty()) {
auto [y,x] = q.front(); q.pop();
res[y][x] = '.';
rep(i,0,4) {
ll ny = y + dy[i], nx = x + dx[i];
if(0 <= ny and ny < n and 0 <= nx and nx < m and res[ny][nx] == '^') {
ll adj = check(ny,nx);
if(adj < 2 and inc[ny][nx] == 0) {
q.push({ny, nx});
inc[ny][nx] = 1;
}
}
}
}
rep(i,0,n) rep(j,0,m) if(A[i][j] == '^' and res[i][j] != '^') return {};
return res;
}
int main() {
Code By Sumfi
hackerCupIO();
cout.precision(12);
ll tc = 1;
cin>>tc;
rep(i,1,tc+1) {
ll n,m;
cin>>n>>m;
vs A(n);
readv(A);
CASE(i)
auto res = solve(A);
if(sz(res) == 0) pimpossible
else {
ppossible
for(auto& r : res) print(r);
}
}
return 0;
}
|
