This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector,fast-math,inline")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,lzcnt,mmx,abm,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
const int N = 5e4, /*X = 5e5, */X2 = 5e0;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n, k, c, ans;
vector<int> vt, adj[N];
bitset<N> bt[N], bt2[N], taken, toTake;
void dfs2(int x) {
if (c++ > X2) return;
int sz = taken.count();
ans = max(ans, sz);
shuffle(all(adj[x]), rng);
for (int& y : adj[x]) {
if (c++ > X2) return;
if (!taken[y] && (taken & bt2[y]).count() < sz) continue;
taken[y] = 1;
bitset<N> toTakePrev = toTake;
toTake &= bt2[y];
dfs2(y);
if (c++ > X2) return;
toTake = toTakePrev;
taken[y] = 0;
}
}
/*
void dfs(int x) {
if (c++ > X) return;
int sz = taken.count();
ans = max(ans, sz);
shuffle(all(adj[x]), rng);
for (int& y : adj[x]) {
if (c++ > X) return;
if (!taken[y] && (taken & bt2[y]).count() < sz) continue;
taken[y] = 1;
bitset<N> toTakePrev = toTake;
toTake &= bt2[y];
dfs(y);
if (c++ > X) return;
toTake = toTakePrev;
taken[y] = 0;
}
}
*/
signed main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
cin >> n >> k;
//c = 0;
ans = 1;
vt.resize(n);
for (int i = 0; i < n; i++) {
vt[i] = i;
bt2[i][i] = toTake[i] = 1;
int x; cin >> x;
for (int j = 0; j < x; j++) {
int y; cin >> y;
bt[i][y] = 1;
if (bt[y][i]) {
bt2[i][y] = 1;
adj[i].push_back(y);
bt2[y][i] = 1;
adj[y].push_back(i);
}
}
}
/*
shuffle(all(vt), rng);
for (int i = 0; i < n && c < X; i++) {
dfs(vt[i]);
}
*/
shuffle(all(vt), rng);
for (int i = 0; i < n; i++) {
c = 0;
taken.reset();
taken[vt[i]] = 1;
toTake = bt2[vt[i]];
dfs2(vt[i]);
}
cout << ans << "\n";
}
Compilation message (stderr)
politicaldevelopment.cpp: In function 'void dfs2(int)':
politicaldevelopment.cpp:25:47: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
25 | if (!taken[y] && (taken & bt2[y]).count() < sz) continue;
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |