Submission #307415

#	Time	Username	Problem	Language	Result	Execution time	Memory
307415		syy	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	30 ms	4352 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define FOR(i, a, b) for(int i = (int)a; i <= (int)b; i++)
#define DEC(i, a, b) for(int i = (int)a; i >= (int)b; i--)
typedef pair<int, int> pi;
typedef pair<pi, int> pii;
typedef pair<pi, pi> pipi;
#define f first
#define s second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<pii> vpii;
#define pb push_back
#define pf push_front
#define all(v) v.begin(), v.end()
#define disc(v) sort(all(v)); v.resize(unique(all(v)) - v.begin());
#define INF (int) 1e9 + 100
#define LLINF (ll) 1e18
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define sandybridge __attribute__((optimize("Ofast"), target("arch=sandybridge")))
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline ll rand(ll x, ll y) { ++y; return (rng() % (y-x)) + x; } //inclusivesss

int n, p[1005], isline[1005];
vi comp[1005];
bool vis[1005];

int fs(int x) {
	if (p[x] == x) return x;
	return p[x] = fs(p[x]);
}

int construct(vector<vector<int>> v) {
	n = v.size();
	vector<vi> ans = vector<vi>(n, vi(n, 0));
	vector<vi> check = vector<vi>(n, vi(n, 0));
	FOR(i, 0, n-1) p[i] = i;
	FOR(i, 0, n-1) FOR(j, 0, n-1) if (v[i][j]) p[fs(i)] = fs(j);
	FOR(i, 0, n-1) comp[fs(i)].pb(i);
	FOR(it, 0, n-1) {
		vi line, cyc;
		for (auto i:comp[it]) {
			bool ok = 0;
			for (auto j:comp[it]) if (i != j and v[i][j] == 1) ok = 1;
			(ok ? line : cyc).pb(i);
			if (ok) isline[i] = i;
		}
		for (auto i:line) {
			if (vis[i]) continue;
			vis[i] = 1;
			cyc.pb(i);
			int pre = i;
			FOR(j, 0, n-1) if (i != j and v[i][j] == 1 and isline[j]) {
				ans[pre][j] = ans[j][pre] = 1;
				pre = j; vis[j] = 1; isline[j] = i;
			}
		}
		FOR(i, 1, cyc.size()-1) ans[cyc[i-1]][cyc[i]] = ans[cyc[i]][cyc[i-1]] = 1;
		if (cyc.size() > 1) ans[cyc[0]][cyc.back()] = ans[cyc.back()][cyc[0]] = 1;
		for (auto i:comp[it]) for (auto j:comp[it]) {
			if (!isline[i] or !isline[j] or isline[i] != isline[j]) check[i][j] = 2;
			else check[i][j] = 1;
			if (i == j) check[i][j] = 1;
		}
	}
	if (check != v) return 0;
	build(ans);
	return 1;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4