oj.uz

Submission #351397

# Submission time Handle Problem Language Result Execution time Memory
351397 2021-01-20T03:08:38 Z Kevin_Zhang_TW Parachute rings (IOI12_rings) C++17
100 / 100
 2238 ms 193388 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
//#include "lib1270.h"
#define DE(...) 0
#define debug(...) 0
#endif
 
const int MAX_N = 1000005;
 
int N, glob;
 
struct dsu {
	vector<int> g, sz;
	vector<short> 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;
		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;
vector<pair<int,int>> alledge;
 
int over = -1, lst;

void canpush(int id) { if (iscan[id]) return; iscan[id] = true, can.pb(id); }
 
void Init(int N_) {
	for (int i = 0;i < N;++i) edge[i].clear(), iscan[i] = false, edge[i].shrink_to_fit();
	big.clear(), can.clear(), forcan.clear(), alledge.clear(), over = -1, lst = 0, alld = forone = dsu();

	N = N_;
	glob = N;
	alld = dsu(N, N);

}
 
void makebig() {
	if (lst == 0)
		forone = dsu(N, N-1);
	while (lst < alledge.size()) {
		auto [a, b] = alledge[lst++];
		if (a != over && b != over)
			forone.M(a, b);
	}
	if (!forone.noring()) glob = -1;
}
void superbig(int id) {
	if (over == -1) {
		over = id;
		return;
	}
	else if (over != id) {
		glob = -1;
		return;
	}
}
void adjust(int a, int b) {

	if (glob == -1) return;
 
	if (big.empty()) {
 
		alld.M(a, b);
 
		glob = alld.getans();
 
		return;
	}
 
 	// 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);
	}

//	for (int x : big) for (int y : big) if (x != y) {
//		assert(edge[x].size() == 3);
//		if (count(AI(edge[y]), x) == 0)
//			glob = -1;
//	}
//	if (glob == -1) return;

	assert(can.size() <= 16);
	// 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();
 
}
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);
 
	alledge.pb(A, B);
 
 	if (edge[A].size() > 3) superbig(A);
 	if (edge[B].size() > 3) superbig(B);
 
	if (over != -1) return makebig(), void();
 
 	if (big.size() > 4) {
 		glob = -1;
 		return;
 	}
	
	adjust(A, B);
}
 
int CountCritical() {
	if (glob == -1) return 0;
	if (over != -1) return forone.noring();
	return max(glob, 0);
}

Compilation message

rings.cpp: In constructor 'dsu::dsu(int, int)':
rings.cpp:27:25: warning: 'dsu::answer' will be initialized after [-Wreorder]
   27 |  int n, badcnt, allbad, answer;
      |                         ^~~~~~
rings.cpp:27:9: warning:   'int dsu::badcnt' [-Wreorder]
   27 |  int n, badcnt, allbad, answer;
      |         ^~~~~~
rings.cpp:30:2: warning:   when initialized here [-Wreorder]
   30 |  dsu (int n, int size) : n(n), answer(size), badcnt(0), allbad(0) {
      |  ^~~
rings.cpp: In function 'void makebig()':
rings.cpp:87:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   87 |  while (lst < alledge.size()) {
      |         ~~~~^~~~~~~~~~~~~~~~
rings.cpp: In function 'void adjust(int, int)':
rings.cpp:142:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |   for (int i = oldsize;i < can.size();++i) {
      |                        ~~^~~~~~~~~~~~
rings.cpp:155:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  155 |   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 19 ms 24428 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 18 ms 24684 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 19 ms 24428 KB Output is correct
10 Correct 21 ms 24428 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 477 ms 49492 KB Output is correct
2 Correct 1279 ms 102216 KB Output is correct
3 Correct 374 ms 162028 KB Output is correct
4 Correct 1223 ms 72908 KB Output is correct
5 Correct 1254 ms 72776 KB Output is correct
6 Correct 1193 ms 71628 KB Output is correct
7 Correct 388 ms 191212 KB Output is correct
8 Correct 1907 ms 124660 KB Output is correct
9 Correct 2238 ms 141144 KB Output is correct
10 Correct 832 ms 71756 KB Output is correct

Subtask #3
18.0 / 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 19 ms 24428 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 18 ms 24684 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 19 ms 24428 KB Output is correct
10 Correct 21 ms 24428 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 26 ms 25580 KB Output is correct
13 Correct 23 ms 25324 KB Output is correct
14 Correct 20 ms 24716 KB Output is correct
15 Correct 20 ms 25324 KB Output is correct
16 Correct 21 ms 24428 KB Output is correct
17 Correct 21 ms 25708 KB Output is correct
18 Correct 22 ms 27372 KB Output is correct
19 Correct 21 ms 24556 KB Output is correct
20 Correct 23 ms 25196 KB Output is correct

Subtask #4
14.0 / 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 19 ms 24428 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 18 ms 24684 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 19 ms 24428 KB Output is correct
10 Correct 21 ms 24428 KB Output is correct
11 Correct 20 ms 24428 KB Output is correct
12 Correct 26 ms 25580 KB Output is correct
13 Correct 23 ms 25324 KB Output is correct
14 Correct 20 ms 24716 KB Output is correct
15 Correct 20 ms 25324 KB Output is correct
16 Correct 21 ms 24428 KB Output is correct
17 Correct 21 ms 25708 KB Output is correct
18 Correct 22 ms 27372 KB Output is correct
19 Correct 21 ms 24556 KB Output is correct
20 Correct 23 ms 25196 KB Output is correct
21 Correct 36 ms 25960 KB Output is correct
22 Correct 50 ms 27108 KB Output is correct
23 Correct 64 ms 28040 KB Output is correct
24 Correct 65 ms 31984 KB Output is correct
25 Correct 33 ms 30316 KB Output is correct
26 Correct 64 ms 32744 KB Output is correct
27 Correct 67 ms 28640 KB Output is correct
28 Correct 53 ms 39532 KB Output is correct
29 Correct 55 ms 41580 KB Output is correct
30 Correct 84 ms 29408 KB Output is correct

Subtask #5
31.0 / 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 19 ms 24428 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 18 ms 24684 KB Output is correct
8 Correct 18 ms 24044 KB Output is correct
9 Correct 19 ms 24428 KB Output is correct
10 Correct 21 ms 24428 KB Output is correct
11 Correct 477 ms 49492 KB Output is correct
12 Correct 1279 ms 102216 KB Output is correct
13 Correct 374 ms 162028 KB Output is correct
14 Correct 1223 ms 72908 KB Output is correct
15 Correct 1254 ms 72776 KB Output is correct
16 Correct 1193 ms 71628 KB Output is correct
17 Correct 388 ms 191212 KB Output is correct
18 Correct 1907 ms 124660 KB Output is correct
19 Correct 2238 ms 141144 KB Output is correct
20 Correct 832 ms 71756 KB Output is correct
21 Correct 20 ms 24428 KB Output is correct
22 Correct 26 ms 25580 KB Output is correct
23 Correct 23 ms 25324 KB Output is correct
24 Correct 20 ms 24716 KB Output is correct
25 Correct 20 ms 25324 KB Output is correct
26 Correct 21 ms 24428 KB Output is correct
27 Correct 21 ms 25708 KB Output is correct
28 Correct 22 ms 27372 KB Output is correct
29 Correct 21 ms 24556 KB Output is correct
30 Correct 23 ms 25196 KB Output is correct
31 Correct 36 ms 25960 KB Output is correct
32 Correct 50 ms 27108 KB Output is correct
33 Correct 64 ms 28040 KB Output is correct
34 Correct 65 ms 31984 KB Output is correct
35 Correct 33 ms 30316 KB Output is correct
36 Correct 64 ms 32744 KB Output is correct
37 Correct 67 ms 28640 KB Output is correct
38 Correct 53 ms 39532 KB Output is correct
39 Correct 55 ms 41580 KB Output is correct
40 Correct 84 ms 29408 KB Output is correct
41 Correct 259 ms 39516 KB Output is correct
42 Correct 807 ms 84824 KB Output is correct
43 Correct 323 ms 82988 KB Output is correct
44 Correct 385 ms 188652 KB Output is correct
45 Correct 590 ms 127964 KB Output is correct
46 Correct 811 ms 66100 KB Output is correct
47 Correct 1070 ms 66888 KB Output is correct
48 Correct 391 ms 193388 KB Output is correct
49 Correct 780 ms 65864 KB Output is correct
50 Correct 844 ms 65628 KB Output is correct
51 Correct 350 ms 77268 KB Output is correct
52 Correct 352 ms 148076 KB Output is correct
53 Correct 354 ms 192876 KB Output is correct
54 Correct 1586 ms 120188 KB Output is correct
55 Correct 1164 ms 111308 KB Output is correct