oj.uz

답안 #350338

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
350338 2021-01-19T05:08:01 Z Kevin_Zhang_TW 낙하산 고리들 (IOI12_rings) C++17
20 / 100
 2819 ms 60524 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) { 
		deg = g = vector<int>(n);
		sz = vector<int>(n, 1);
		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
		// which means you have to remove objects on the ring
		// all of them is ok, since max deg is 2
		// I only care when max deg is <= 2
		// and a ring cannot merge with other for max deg <= 2
		answer = sz[a];
	}
	bool noring() { return badcnt == 0 && allbad == false; }

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

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);
	assert(N <= 20000);
// 	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 superbig(int id) {
	if (over == -1) {
		over = id;
		forone = dsu(N, N-1);
		for (auto [a, b] : alledge)
			if (a != id && b != id)
				forone.M(a, b);
		glob = forone.noring();
	}
	else if (over != id) {
		glob = -1;
		return;
	}
	else {
		auto [a, b] = alledge.back();
		if (a != id && b != id)
			forone.M(a, b);
		glob = forone.noring();
	}
}
void adjust(int a, int b) {
	if (glob == -1) return;

	DE(a, b);

	if (big.empty()) {
		assert(can.empty());

		alld.M(a, b);

		glob = alld.getans();

		return;
	}

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

// 
// 	// deal with old ones
// 	int oldsize = can.size();
// 	for (int i = 0;i < oldsize;++i) {
// 		int x = can[i];
// 		if (a != x && b != x)
// 			forcan[i].M(a, b);
// 	}
// 
	// put new element into candidate
	for (int x : big) {
		// assert(edge[x].size() <= 3);
		canpush(x);
		for (int u : edge[x]) canpush(u);
	}
	// 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);
// 		}
// 	}

	// assert(forcan.size() == can.size());

	glob = 0;

// 	// examine all candidates
// 	for (int i = 0;i < can.size();++i) 
// 		glob += forcan[i].noring();


	for (int x : can) {
		dsu D(N, N - 1);

		for (auto [a, b] : alledge) if (a != x && b != x) 
			D.M(a, b);

		if (D.noring()) ++glob;
	}

}
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 (edge[A].size() > 3) superbig(A);
// 	if (edge[B].size() > 3) superbig(B);

	alledge.pb(A, B);

	if (over != -1) {
	   superbig(over);
	   return;
	}

 	if (big.size() > 4) {
 		glob = -1;
 		return;
 	}
	
	adjust(A, B);
}

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

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:112:2: note: in expansion of macro 'DE'
  112 |  DE(a, b);
      |  ^~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 622 ms 24172 KB Output is correct
3 Correct 1838 ms 24696 KB Output is correct
4 Correct 17 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 19 ms 24172 KB Output is correct
7 Correct 41 ms 23916 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 983 ms 24172 KB Output is correct
10 Correct 808 ms 24172 KB Output is correct

Subtask #2
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 59 ms 60524 KB Execution killed with signal 6 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 622 ms 24172 KB Output is correct
3 Correct 1838 ms 24696 KB Output is correct
4 Correct 17 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 19 ms 24172 KB Output is correct
7 Correct 41 ms 23916 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 983 ms 24172 KB Output is correct
10 Correct 808 ms 24172 KB Output is correct
11 Correct 942 ms 24420 KB Output is correct
12 Correct 368 ms 24608 KB Output is correct
13 Incorrect 2819 ms 24596 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 622 ms 24172 KB Output is correct
3 Correct 1838 ms 24696 KB Output is correct
4 Correct 17 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 19 ms 24172 KB Output is correct
7 Correct 41 ms 23916 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 983 ms 24172 KB Output is correct
10 Correct 808 ms 24172 KB Output is correct
11 Correct 942 ms 24420 KB Output is correct
12 Correct 368 ms 24608 KB Output is correct
13 Incorrect 2819 ms 24596 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 622 ms 24172 KB Output is correct
3 Correct 1838 ms 24696 KB Output is correct
4 Correct 17 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 19 ms 24172 KB Output is correct
7 Correct 41 ms 23916 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 983 ms 24172 KB Output is correct
10 Correct 808 ms 24172 KB Output is correct
11 Runtime error 59 ms 60524 KB Execution killed with signal 6 (could be triggered by violating memory limits)
12 Halted 0 ms 0 KB -