#include <bits/stdc++.h>
#ifdef local
#define debug(x...) qqbx(#x, x)
#define pary(x...) danb(#x, x)
#define safe std::cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
template <typename ...T> void qqbx(const char *s, T ...a) {
int cnt = sizeof...(T);
((std::cerr << "(" << s << ") = ("), ..., (std::cerr << a << (--cnt ? ", " : ")\n")));
}
template <typename T> void danb(const char *t, T L, T R) {
std::cerr << "[ " << t << " ] = [ ";
for (int f = 0; L != R; ++L) std::cerr << (f++ ? ", " : "") << *L;
std::cerr << " ]\n";
}
#else
#define debug(...) ((void)0)
#define pary(...) ((void)0)
#define safe ((void)0)
#endif // local
using namespace std;
// #include "lib1270.h"
const int maxn = 1000025, K = 9;
struct Dsu {
int pa[maxn], rk[maxn];
int deg[maxn];
bool ok;
void init(int n) {
for (int i = 0; i < n; i++) pa[i] = i, rk[i] = 0, deg[i] = 0;
ok = true;
}
int anc(int x) { return x==pa[x] ? x : pa[x]=anc(pa[x]); }
bool join(int x, int y) {
if (++deg[x] == 3) ok = false;
if (++deg[y] == 3) ok = false;
if ((x=anc(x)) == (y=anc(y))) return ok = false;
if (rk[x] < rk[y]) swap(x, y);
return pa[y] = x, rk[x]!=rk[y] || ++rk[x];
}
} dsu[K];
vector<int> cand;
pair<int,int> E[maxn];
vector<int> adj[maxn];
int tot, N;
bool global_ok;
void Init(int _N) {
N = _N;
for (int i = 0; i < K; i++)
dsu[i].init(N);
for (int i = 0; i < N; i++)
adj[i].clear();
cand.clear();
tot = 0;
global_ok = true;
}
void addCand(int x) {
if (cand.size() > K) return;
int pos = cand.size();
cand.push_back(x);
if (cand.size() > K) return;
for (int i = 0; i < tot; i++)
if (x != E[i].first && x != E[i].second)
dsu[pos].join(E[i].first, E[i].second);
}
void Link(int a, int b) {
if (!global_ok) return;
if (adj[a].size() >= 3 || adj[b].size() >= 3) return global_ok = false, void();
if (adj[a].size() == 2) {
addCand(a);
for (int j: adj[a])
addCand(j);
}
if (adj[b].size() == 2) {
addCand(b);
for (int j: adj[b])
addCand(j);
}
E[tot++] = { a, b };
adj[a].push_back(b);
adj[b].push_back(a);
for (int i = 0; i < cand.size(); i++)
if (a != cand[i] && b != cand[i])
dsu[i].join(a, b);
}
int CountCritical() {
if (cand.size() > K) return 0;
if (cand.size() == 0) return N;
int ans = 0;
for (int i = 0; i < cand.size(); i++) if (dsu[i].ok) ++ans;
return ans;
}
signed main() {
ios_base::sync_with_stdio(0), cin.tie(0);
}
Compilation message
rings.cpp: In function 'void Link(int, int)':
rings.cpp:82:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | for (int i = 0; i < cand.size(); i++)
| ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
90 | for (int i = 0; i < cand.size(); i++) if (dsu[i].ok) ++ans;
| ~~^~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccGptlpR.o: in function `main':
rings.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc0cMUCS.o:grader.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
