oj.uz

Submission #350206

# Submission time Handle Problem Language Result Execution time Memory
350206 2021-01-19T04:16:13 Z Kevin_Zhang_TW Parachute rings (IOI12_rings) C++17
37 / 100
 2467 ms 189548 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;

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}

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;
	}

	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) {

// 
// 	for (int i = 0;i < N;++i) if (i != A && i != B)
// 		adsu[i].M(A, B);
// 
// 	return;

	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() > 3) {
		glob = -1;
		return;
	}
	adjust(A, B);
}

int CountCritical() {
// 	int res = 0;
// 	for (int i = 0;i < N;++i)
// 		if (adsu[i].getans() == N - 1) ++res;
// 	return res;
// 
	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:87:2: note: in expansion of macro 'DE'
   87 |  DE(a, b);
      |  ^~
rings.cpp:110:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  110 |  for (int i = oldsize;i < can.size();++i) {
      |                       ~~^~~~~~~~~~~~
rings.cpp:119:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |  for (int i = 0;i < can.size();++i) {
      |                 ~~^~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 19 ms 24300 KB Output is correct
3 Correct 21 ms 25324 KB Output is correct
4 Correct 19 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 18 ms 24172 KB Output is correct
7 Correct 18 ms 24556 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 22 ms 24456 KB Output is correct
10 Correct 21 ms 24508 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 541 ms 50260 KB Output is correct
2 Correct 1830 ms 177476 KB Output is correct
3 Correct 410 ms 189548 KB Output is correct
4 Correct 1275 ms 74944 KB Output is correct
5 Correct 1270 ms 74876 KB Output is correct
6 Correct 1224 ms 73680 KB Output is correct
7 Correct 373 ms 177516 KB Output is correct
8 Correct 2011 ms 137556 KB Output is correct
9 Correct 2467 ms 156856 KB Output is correct
10 Correct 872 ms 72520 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 19 ms 24300 KB Output is correct
3 Correct 21 ms 25324 KB Output is correct
4 Correct 19 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 18 ms 24172 KB Output is correct
7 Correct 18 ms 24556 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 22 ms 24456 KB Output is correct
10 Correct 21 ms 24508 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 23 ms 25068 KB Output is correct
13 Incorrect 24 ms 25324 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 19 ms 24300 KB Output is correct
3 Correct 21 ms 25324 KB Output is correct
4 Correct 19 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 18 ms 24172 KB Output is correct
7 Correct 18 ms 24556 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 22 ms 24456 KB Output is correct
10 Correct 21 ms 24508 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 23 ms 25068 KB Output is correct
13 Incorrect 24 ms 25324 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 23788 KB Output is correct
2 Correct 19 ms 24300 KB Output is correct
3 Correct 21 ms 25324 KB Output is correct
4 Correct 19 ms 23916 KB Output is correct
5 Correct 18 ms 24044 KB Output is correct
6 Correct 18 ms 24172 KB Output is correct
7 Correct 18 ms 24556 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 22 ms 24456 KB Output is correct
10 Correct 21 ms 24508 KB Output is correct
11 Correct 541 ms 50260 KB Output is correct
12 Correct 1830 ms 177476 KB Output is correct
13 Correct 410 ms 189548 KB Output is correct
14 Correct 1275 ms 74944 KB Output is correct
15 Correct 1270 ms 74876 KB Output is correct
16 Correct 1224 ms 73680 KB Output is correct
17 Correct 373 ms 177516 KB Output is correct
18 Correct 2011 ms 137556 KB Output is correct
19 Correct 2467 ms 156856 KB Output is correct
20 Correct 872 ms 72520 KB Output is correct
21 Correct 20 ms 24428 KB Output is correct
22 Correct 23 ms 25068 KB Output is correct
23 Incorrect 24 ms 25324 KB Output isn't correct
24 Halted 0 ms 0 KB -