oj.uz

Submission #350218

# Submission time Handle Problem Language Result Execution time Memory
350218 2021-01-19T04:20:43 Z Kevin_Zhang_TW Parachute rings (IOI12_rings) C++17
37 / 100
 2483 ms 236396 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T L, T R) { while (L != R) cerr << *L << " \n"[next(L) == R], ++L; }
#else
#define DE(...) 0
#define debug(...) 0
#endif

const int MAX_N = 1000005;

int N, glob;

struct dsu {
	vector<int> g, sz, deg;

	int n, badcnt, allbad, answer;

	dsu() {};
	dsu (int n, int size) : n(n), answer(size), badcnt(0), allbad(0) { 
		g.resize(n);
		sz.resize(n, 1);
		deg.resize(n);
		iota(AI(g), 0); 
	}

	int F(int i) { return i == g[i] ? i : g[i] = F(g[i]); }

	void M(int a, int b) { 

		if (max(++deg[a], ++deg[b]) >= 3) allbad = true;

		if (allbad) return;

		a = F(a), b = F(b);
		if (sz[a] < sz[b]) swap(a, b);

		if (a != b) {
			return sz[a] += sz[b], g[b] = a, void();
		}
		if (++badcnt == 2) allbad = true;
		// merging into a ring
		answer = sz[a];

	}

	int getans() { 
		return allbad ? 0 : answer;
	}
};

// dsu adsu[20010];

dsu alld, forone;

vector<int> edge[MAX_N];

bool iscan[MAX_N];

vector<int> big, can;

vector<dsu> forcan;

void canpush(int id) { if (iscan[id]) return; iscan[id] = true, can.pb(id); }

void Init(int N_) {
	N = N_;
	glob = N;
	alld = dsu(N, N);
// 	for (int i = 0;i < N;++i)
// 		adsu[i] = dsu(N, N-1);
}

vector<pair<int,int>> alledge;
// TODO big crisis
// new edge is {a, b}
int over = -1;

void pushbig(int id) {
	if (id == over) return;

}
void adjust(int a, int b) {
	DE(a, b);
	if (glob == -1) return;

	if (big.empty()) {
		alld.M(a, b);
		glob = alld.getans();
		alledge.pb(a, b);
		return;
	}

// 	pushbig(a), pushbig(b);
// 
// 	if (over != -1) {
// 		if (a != over && b != over)
// 			forone.M(a, b);
// 		glob = forone.getans() == N - 1 ? 1 : -1;
// 	}

	glob = 0;

	int oldsize = forcan.size();
	// put new element into candidate
	for (int x : big) {
		canpush(x);
		for (int u : edge[x]) canpush(u);
	}

	// cerr << "a lot of candidate\n";
	// debug(AI(can));

	// examine new candidates

	for (int i = oldsize;i < can.size();++i) {
		forcan.pb(N, N-1);
		int x = can[i];
		for (auto [a, b] : alledge) if (a != x && b != x) {
			forcan[i].M(a, b);
		}
	}

	// examine all candidates
	for (int i = 0;i < can.size();++i) {
		int x = can[i];
		if (a != x && b != x)
			forcan[i].M(a, b);
		// DE(x, forcan[i].getans(), N-1);
		glob += forcan[i].getans() == N - 1;
	}

	alledge.pb(a, b);
}
void Link(int A, int B) {
	if (glob == -1) return;
	edge[A].pb(B), edge[B].pb(A);
	if (edge[A].size() == 3) big.pb(A);
	if (edge[B].size() == 3) big.pb(B);
	if (big.size() > 4) {
		glob = -1;
		return;
	}
	adjust(A, B);
}

int CountCritical() {
	return max(0, glob);
}

Compilation message

rings.cpp: In constructor 'dsu::dsu(int, int)':
rings.cpp:25:25: warning: 'dsu::answer' will be initialized after [-Wreorder]
   25 |  int n, badcnt, allbad, answer;
      |                         ^~~~~~
rings.cpp:25:9: warning:   'int dsu::badcnt' [-Wreorder]
   25 |  int n, badcnt, allbad, answer;
      |         ^~~~~~
rings.cpp:28:2: warning:   when initialized here [-Wreorder]
   28 |  dsu (int n, int size) : n(n), answer(size), badcnt(0), allbad(0) {
      |  ^~~
rings.cpp: In function 'void adjust(int, int)':
rings.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
rings.cpp:92:2: note: in expansion of macro 'DE'
   92 |  DE(a, b);
      |  ^~
rings.cpp:124:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |  for (int i = oldsize;i < can.size();++i) {
      |                       ~~^~~~~~~~~~~~
rings.cpp:133:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |  for (int i = 0;i < can.size();++i) {
      |                 ~~^~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 21 ms 24300 KB Output is correct
3 Correct 22 ms 25308 KB Output is correct
4 Correct 20 ms 23916 KB Output is correct
5 Correct 21 ms 24044 KB Output is correct
6 Correct 21 ms 24172 KB Output is correct
7 Correct 18 ms 24812 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 20 ms 24428 KB Output is correct
10 Correct 22 ms 24556 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 598 ms 50340 KB Output is correct
2 Correct 1886 ms 177436 KB Output is correct
3 Correct 427 ms 236396 KB Output is correct
4 Correct 1314 ms 74668 KB Output is correct
5 Correct 1258 ms 74696 KB Output is correct
6 Correct 1212 ms 73292 KB Output is correct
7 Correct 424 ms 224660 KB Output is correct
8 Correct 2073 ms 137356 KB Output is correct
9 Correct 2483 ms 156888 KB Output is correct
10 Correct 856 ms 72524 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 21 ms 24300 KB Output is correct
3 Correct 22 ms 25308 KB Output is correct
4 Correct 20 ms 23916 KB Output is correct
5 Correct 21 ms 24044 KB Output is correct
6 Correct 21 ms 24172 KB Output is correct
7 Correct 18 ms 24812 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 20 ms 24428 KB Output is correct
10 Correct 22 ms 24556 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 24 ms 25836 KB Output is correct
13 Incorrect 25 ms 25580 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 21 ms 24300 KB Output is correct
3 Correct 22 ms 25308 KB Output is correct
4 Correct 20 ms 23916 KB Output is correct
5 Correct 21 ms 24044 KB Output is correct
6 Correct 21 ms 24172 KB Output is correct
7 Correct 18 ms 24812 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 20 ms 24428 KB Output is correct
10 Correct 22 ms 24556 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 24 ms 25836 KB Output is correct
13 Incorrect 25 ms 25580 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23788 KB Output is correct
2 Correct 21 ms 24300 KB Output is correct
3 Correct 22 ms 25308 KB Output is correct
4 Correct 20 ms 23916 KB Output is correct
5 Correct 21 ms 24044 KB Output is correct
6 Correct 21 ms 24172 KB Output is correct
7 Correct 18 ms 24812 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 20 ms 24428 KB Output is correct
10 Correct 22 ms 24556 KB Output is correct
11 Correct 598 ms 50340 KB Output is correct
12 Correct 1886 ms 177436 KB Output is correct
13 Correct 427 ms 236396 KB Output is correct
14 Correct 1314 ms 74668 KB Output is correct
15 Correct 1258 ms 74696 KB Output is correct
16 Correct 1212 ms 73292 KB Output is correct
17 Correct 424 ms 224660 KB Output is correct
18 Correct 2073 ms 137356 KB Output is correct
19 Correct 2483 ms 156888 KB Output is correct
20 Correct 856 ms 72524 KB Output is correct
21 Correct 20 ms 24428 KB Output is correct
22 Correct 24 ms 25836 KB Output is correct
23 Incorrect 25 ms 25580 KB Output isn't correct
24 Halted 0 ms 0 KB -