QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#525580 | #5668. Cell Nuclei Detection | QRQRQR | TL | 27ms | 208540kb | C++20 | 5.6kb | 2024-08-20 18:45:43 | 2024-08-20 18:45:43 |
Judging History
answer
#include <bits/stdc++.h>
#ifdef LOCAL
using std::cerr;
#define safe cerr << __PRETTY_FUNCTION__ << " Line " << __LINE__ << " safe\n"
#define debug(args...) qqbx(#args, args)
#define orange(args...) danb(#args, args)
template <typename ...T> void qqbx(const char *s, T ...args) {
int cnt = sizeof...(T);
((cerr << "\033[1;32m(" << s << ")=("), ...,
(cerr << args << (--cnt?", ":")\e[0m\n")));
}
template <typename T> void danb(const char *s, T L, T R) {
cerr << "\033[1;32m[ " << s << " ] = [ ";
for (int f = 0; L != R; ++L) cerr << (f++?", ":"") << *L;
cerr << " ]\033[0m\n";
}
#else
#define safe ((void)0)
#define debug(...) ((void)0)
#define orange(...) ((void)0)
#endif
#define int long long
#define F first
#define S second
#define pb push_back
#define ALL(x) begin(x), end(x)
#define lowbit(x) (x & (-x))
using namespace std;
using pii = pair<int, int>;
using ll = long long;
struct Rect {
int x1, y1, x2, y2;
Rect() {}
Rect(int _x1, int _y1, int _x2, int _y2) : x1(_x1), y1(_y1), x2(_x2), y2(_y2) {}
};
struct Dinic {
const int INF = 1<<30;
static const int MAXN = 100001;
struct Edge {
int u, v;
int cap, rest;
};
int n, m, s, t, d[MAXN], cur[MAXN];
vector<Edge> edges;
vector<int> G[MAXN];
void init() {
edges.clear();
for (int i = 0; i < MAXN; i++) {
G[i].clear();
}
}
void add_edge(int u, int v, int cap) {
edges.push_back({u, v, cap, cap});
edges.push_back({v, u, 0, 0});
m = edges.size();
G[u].push_back(m-2);
G[v].push_back(m-1);
}
bool bfs() {
memset(d, -1, sizeof(d));
queue<int> que;
que.push(s); d[s] = 0;
while (!que.empty()) {
int u = que.front(); que.pop();
for (int ei : G[u]) {
Edge &e = edges[ei];
if (d[e.v] < 0 && e.rest > 0) {
d[e.v] = d[u] + 1;
que.push(e.v);
}
}
}
return d[t] >= 0;
}
int dfs(int u, int a) {
if (u == t || a == 0) return a;
int flow = 0, f;
for (int &i = cur[u]; i < (int)G[u].size(); i++) {
Edge &e = edges[G[u][i]];
if (d[u] + 1 != d[e.v]) continue;
f = dfs(e.v, min(a, e.rest));
if (f > 0) {
e.rest -= f;
edges[G[u][i] ^ 1].rest += f;
flow += f;
a -= f;
if (a == 0) break;
}
}
return flow;
}
int maxflow(int s, int t) {
this->s = s, this->t = t;
int flow = 0, mf;
while (bfs()) {
memset(cur, 0, sizeof(cur));
while ((mf = dfs(s, INF))) {
flow += mf;
}
}
return flow;
}
};
int n, m;
Rect ground[50001];
int area[50001];
Rect detect[50001];
set<int> mp[2001][2001];
set<int> connect[50001];
void sol() {
Dinic *flow = new Dinic();
flow->init();
int xl = 2000, xr = 0, yl = 2000, yr = 0;
for (int i = 0; i < m; i++) {
auto [x1, y1, x2, y2] = ground[i];
xl = min({xl, x1, x2});
xr = max({xr, x1, x2});
yl = min({yl, y1, y2});
yr = max({yr, y1, y2});
area[i] = 0;
for (int x = x1; x < x2+1; x++) {
for (int y = y1; y < y2+1; y++) {
mp[x][y].insert(i);
area[i]++;
}
}
}
int nc = 0, mc = 0;
for (int i = 0; i < n; i++) {
auto [x1, y1, x2, y2] = detect[i];
xl = min({xl, x1, x2});
xr = max({xr, x1, x2});
yl = min({yl, y1, y2});
yr = max({yr, y1, y2});
map<int, int> cnt;
for (int x = x1; x < x2+1; x++) {
for (int y = y1; y < y2+1; y++) {
for (auto id : mp[x][y]) {
cnt[id]++;
}
}
}
int v = 0;
for (auto [id, c] : cnt) {
if (c >= (area[id] + 1) / 2 + 1) {
connect[i].insert(id);
v = 1;
}
}
nc += v;
}
set<int> seen;
for (int i = 0, id = 0; i < n; i++) {
if (connect[i].size()) {
for (int j : connect[i]) {
flow->add_edge(id, nc+j, 1);
seen.insert(j);
}
id++;
}
}
mc = seen.size();
for (int i = 0; i < nc; i++) {
flow->add_edge(nc+mc, i, 1);
}
for (int i = nc; i < nc+mc; i++) {
flow->add_edge(i, nc+mc+1, 1);
}
ll ans = flow->maxflow(nc+mc, nc+mc+1);
cout << ans << '\n';
for (int i = xl; i < xr+1; i++) {
for (int j = yl; j < yr+1; j++) {
mp[i][j] = set<int>();
}
}
for (int i = 0; i < n+m; i++) connect[i] = set<int>();
}
signed main() {
ios::sync_with_stdio(0), cin.tie(0);
int tc = 1;
cin >> tc;
while (tc--) {
cin >> m >> n;
int x1, y1, x2, y2;
for (int i = 0; i < m; i++) {
cin >> x1 >> y1 >> x2 >> y2;
if (x1 > x2) swap(x1, x2);
if (y1 > y2) swap(y1, y2);
ground[i] = Rect(x1, y1, x2, y2);
}
for (int i = 0; i < n; i++) {
cin >> x1 >> y1 >> x2 >> y2;
if (x1 > x2) swap(x1, x2);
if (y1 > y2) swap(y1, y2);
detect[i] = Rect(x1, y1, x2, y2);
}
sol();
}
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 16ms
memory: 208540kb
input:
3 2 2 1 1 3 3 3 3 5 5 2 2 4 4 4 4 6 6 2 3 1 1 3 3 3 3 5 5 1 3 3 5 2 1 4 5 3 1 5 3 3 3 1 1 2 2 2 2 3 3 3 3 4 4 1 1 3 3 2 2 4 4 3 3 5 5
output:
0 1 3
result:
ok 3 lines
Test #2:
score: 0
Accepted
time: 27ms
memory: 207856kb
input:
3 2 2 1 1 3 3 3 3 5 5 2 2 4 4 4 4 6 6 2 3 1 1 3 3 3 3 5 5 1 3 3 5 2 1 4 5 3 1 5 3 3 3 1 1 2 2 2 2 3 3 3 3 4 4 1 1 3 3 2 2 4 4 3 3 5 5
output:
0 1 3
result:
ok 3 lines
Test #3:
score: -100
Time Limit Exceeded
input:
5 50000 50000 0 0 4 4 4 0 8 4 8 0 12 4 12 0 16 4 16 0 20 4 20 0 24 4 24 0 28 4 28 0 32 4 32 0 36 4 36 0 40 4 40 0 44 4 44 0 48 4 48 0 52 4 52 0 56 4 56 0 60 4 60 0 64 4 64 0 68 4 68 0 72 4 72 0 76 4 76 0 80 4 80 0 84 4 84 0 88 4 88 0 92 4 92 0 96 4 96 0 100 4 100 0 104 4 104 0 108 4 108 0 112 4 112 ...