#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
/* typedef tree<int,null_type,less<int>,rb_tree_tag,
tree_order_statistics_node_update> indexed_set; */
#define el "\n"
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
#define F first
#define S second
#define sz(x) (int)(x).size()
#define setcontains(set, x) (set.find(x) != set.end())
#define umap unordered_map
#define uset unordered_set
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<pll> vpll;
#define rep(i, a, b) for (int i = (a); i < (b); ++i)
#define trav(a, x) for (auto &a : x)
struct chash { // large odd number for C
const uint64_t C = ll(4e18 * acos(0)) | 71;
ll operator()(ll x) const { return __builtin_bswap64(x * C); }
};
template<typename T> using fast_set = __gnu_pbds::gp_hash_table<T, null_type, chash>;
template<typename T, typename H> using fast_set_h = __gnu_pbds::gp_hash_table<T, null_type, H>;
template<typename T, typename U> using fast_map = __gnu_pbds::gp_hash_table<T, U, chash>;
#ifdef DEBUG
#include "/home/redkar/kod/cp/lib/debug.cpp"
#else
#define dbg(...)
#define dbgArr(...)
#endif
const ll inf = 1e11;
const ll heavy = 30;
vpll dirs = {{0, 1}, {1, 0}, {-1, 0}, {0, -1}};
ll r, c, q;
ll get_ind(ll R, ll C) {
if (0 <= R && R < r && 0 <= C && C < c) {
return R*c + C;
}
else return -1;
}
struct UF {
vll col, parent;
vector<fast_set<ll>> edges;
vector<fast_map<ll, set<ll>>> buddy;
vector<fast_set<ll>> heavybuddy;
uset<ll> bigboys;
UF(ll n, vll grid): col(n), parent(n), edges(n), buddy(n), heavybuddy(n) {
rep(i, 0, n) {
parent[i] = i;
col[i] = grid[i];
}
}
ll find(ll x) {
if (x != parent[x]) parent[x] = find(parent[x]);
return parent[x];
}
void merge(ll a, ll b) {
a = find(a); b = find(b);
if (a == b) return;
parent[b] = a;
}
void bucket(ll node, ll C) {
node = find(node);
col[node] = C;
ll bst = node;
uset<ll> compnodes;
for(auto it = buddy[node][C].begin(); it != buddy[node][C].end();) {
ll e = find(*it);
if (col[e] == C) {
compnodes.insert(*it);
if (sz(edges[e]) > sz(edges[bst])) {
bst = e;
}
it = next(it);
}
else {
it = buddy[node][C].erase(it);
}
}
buddy[node][C].clear();
trav(edge, heavybuddy[node]) {
ll e = find(edge);
if (col[e] == C) {
compnodes.insert(e);
if (sz(edges[e]) > sz(edges[bst])) {
bst = e;
}
}
}
compnodes.insert(node);
trav(cur, compnodes) {
ll cnode = find(cur);
if (cnode == bst) continue;
parent[cnode] = bst;
trav(edge, edges[cnode]) {
heavybuddy[edge].erase(cur);
heavybuddy[edge].erase(cnode);
ll e = find(edge);
if (setcontains(bigboys, bst)) {
heavybuddy[e].insert(bst);
}
edges[bst].insert(e);
}
trav(edge, heavybuddy[cnode]) {
ll e = find(edge);
heavybuddy[bst].insert(e);
}
trav(edge, buddy[cnode]) {
trav(nb, edge.S) {
buddy[bst][edge.F].insert(nb);
}
}
}
node = find(node);
if (!setcontains(bigboys, node)) {
if (sz(edges[node]) > heavy) {
bigboys.insert(node);
trav(edge, edges[node]) {
ll e = find(edge);
heavybuddy[e].insert(node);
}
}
else {
trav(edge, edges[node]) {
ll e = find(edge);
buddy[e][C].insert(node);
}
}
}
}
};
void solve() {
cin >> r >> c;
vll grid(r*c);
rep(i, 0, r*c) {
cin >> grid[i];
}
UF uf(r*c, grid);
rep(phase, 0, 2) {
rep(i, 0, r) rep(j, 0, c) {
ll cell = get_ind(i, j);
ll cell_leader = uf.find(cell);
trav(d, dirs) {
ll y = i + d.F, x = j + d.S;
if (y < 0 || y >= r || x < 0 || x >= c) continue;
ll nb_cell = get_ind(y, x);
ll nb_leader = uf.find(nb_cell);
if (grid[cell] == grid[nb_cell] && phase == 0) {
uf.merge(cell, nb_cell);
}
else if (grid[cell] != grid[nb_cell] && phase == 1) {
uf.buddy[cell_leader][uf.col[nb_leader]].insert(nb_leader);
uf.buddy[nb_leader][uf.col[cell_leader]].insert(cell_leader);
uf.edges[cell_leader].insert(nb_leader);
uf.edges[nb_leader].insert(cell_leader);
}
}
}
}
cin >> q;
while(q--) {
ll y, x, C;
cin >> y >> x >> C; y--, x--;
ll cur = uf.find(get_ind(y, x));
if (uf.col[cur] != C) {
uf.bucket(cur, C);
}
}
rep(i, 0, r) {
rep(j, 0, c) {
cout << uf.col[uf.find(get_ind(i, j))] << " ";
}
cout << el;
}
}
int main() {
faster
solve();
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
1624 KB |
Output is correct |
| 2 |
Correct |
2 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
31 ms |
23304 KB |
Output is correct |
| 4 |
Correct |
37 ms |
20952 KB |
Output is correct |
| 5 |
Correct |
24 ms |
16756 KB |
Output is correct |
| 6 |
Correct |
27 ms |
15708 KB |
Output is correct |
| 7 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
287 ms |
104516 KB |
Output is correct |
| 2 |
Correct |
281 ms |
131912 KB |
Output is correct |
| 3 |
Correct |
273 ms |
253240 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
568 ms |
311860 KB |
Output is correct |
| 2 |
Correct |
582 ms |
308784 KB |
Output is correct |
| 3 |
Correct |
659 ms |
306756 KB |
Output is correct |
| 4 |
Correct |
733 ms |
297968 KB |
Output is correct |
| 5 |
Correct |
567 ms |
278156 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
866 ms |
298968 KB |
Output is correct |
| 2 |
Correct |
801 ms |
325660 KB |
Output is correct |
| 3 |
Correct |
974 ms |
356064 KB |
Output is correct |
| 4 |
Correct |
930 ms |
330744 KB |
Output is correct |
| 5 |
Correct |
1111 ms |
411204 KB |
Output is correct |
| 6 |
Correct |
418 ms |
322768 KB |
Output is correct |
| 7 |
Correct |
360 ms |
296204 KB |
Output is correct |
| 8 |
Correct |
347 ms |
271060 KB |
Output is correct |
| 9 |
Correct |
996 ms |
397352 KB |
Output is correct |
