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Submission #742724

# Submission time Handle Problem Language Result Execution time Memory
742724 2023-05-16T19:45:08 Z sidon Simurgh (IOI17_simurgh) C++17
100 / 100
 393 ms 8508 KB 
#include <bits/stdc++.h>
#include "simurgh.h"
using namespace std;

struct UFDS {
	vector<int> e;
	int operator()(int u) {
		return e[u] < 0 ? u : e[u] = (*this)(e[u]);
	}
	bool operator()(int u, int v) {
		u = (*this)(u), v = (*this)(v);
		if(u == v) return false;
		if(e[u] > e[v]) swap(u, v);
		e[u] += e[v], e[v] = u;
		return true;
	}
	UFDS(int n) { e.assign(n, -1); }
};

const int Z = 500, NE = Z * Z / 2;

int vis[Z], visE[NE], t[NE], backedgeFrom[NE];
vector<int> st;
vector<array<int, 2>> g[Z], s, h[NE], q;
vector<array<int, 3>> o;

int ask(int u, int v) {
	for(int &j : st) if(j == u) j = v;
	int res = count_common_roads(st);
	for(int &j : st) if(j == v) j = u;

	return res;
}

void dfs(int u, int p) {
	vis[u] = 1;
	for(auto [v, i] : g[u]) if(v != p) {
		if(vis[v] == 1) {
			for(int j = size(s); j--; ) {
				backedgeFrom[s[j][1]] = i;
				t[s[j][1]] = -1;

				if(s[j][0] == v) break;
				int a = s[j][1], b = s[j-1][1];

				if(!visE[a]++) o.push_back({a, b, i});
			}
		} else if(!vis[v]) {
			s.push_back({u, i});
			st.push_back(i);
			t[i] = 1;
			dfs(v, u);
			s.pop_back();
		}
	}
	vis[u] = 2;
}

void color(int u) {
	for(auto [v, w] : h[u]) if(t[v] < 0) {
		t[v] = t[u] ^ w;
		color(v);
	}
}

vector<int> find_roads(int n, vector<int> U, vector<int> V) {
	for(int i = size(U); i--; ) {
		g[U[i]].push_back({V[i], i});
		g[V[i]].push_back({U[i], i});
	}

	fill(t, t + NE, -1);
	dfs(0, 0);

	int def = count_common_roads(st);

	for(auto [a, b, i] : o) {	
		int x = ask(a, i), y = ask(b, i);

		h[b].push_back({a, x != y});
		h[a].push_back({b, x != y});

		if(x != y) q.push_back({a, x < y});
	}

	while(1) {
		for(auto [u, w] : q) if(t[u] < 0) {
			t[u] = w;
			color(u);
		}
		q.clear();

		bool done = 1;
		for(int i : st) if(t[i] < 0) {
			int e = backedgeFrom[i];
			done = 0;

			q.push_back({i, ask(i, e) < def});
		} 
		if(done) break;
	}

	for(int u = 0; u < n; ++u) {
		vector<int> a;
		for(auto [v, i] : g[u]) if(u < v && t[i] < 0)
			a.push_back(i);

		while(!empty(a)) {
			int x = 0;
			for(int y = 1<<10; y /= 2; ) if(x + y <= (int)size(a)) {
				x += y;

				UFDS uf(n);
				vector<int> qry;
				for(int i = 0; i < x; ++i) {
					uf(U[a[i]], V[a[i]]);
					qry.push_back(a[i]);
				}

				int cnt {};
				for(int e : st) if(uf(U[e], V[e])) {
					qry.push_back(e);
					cnt += t[e];
				}

				if(cnt < count_common_roads(qry)) x -= y;
			}
			for(int i = 0; i < x; ++i)
				t[a[i]] = 0;
			if(x == (int)size(a)) break;
			t[a[x]] = 1;
			a = vector<int> {begin(a) + x + 1, end(a)};			
		}
	}

	vector<int> res;
	for(int i = size(U); i--; )
		if(t[i] == 1) res.push_back(i);
	return res;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3668 KB correct
2 Correct 2 ms 3668 KB correct
3 Correct 2 ms 3668 KB correct
4 Correct 2 ms 3668 KB correct
5 Correct 2 ms 3668 KB correct
6 Correct 2 ms 3636 KB correct
7 Correct 3 ms 3668 KB correct
8 Correct 2 ms 3636 KB correct
9 Correct 2 ms 3668 KB correct
10 Correct 2 ms 3668 KB correct
11 Correct 2 ms 3640 KB correct
12 Correct 2 ms 3644 KB correct
13 Correct 2 ms 3636 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3668 KB correct
2 Correct 2 ms 3668 KB correct
3 Correct 2 ms 3668 KB correct
4 Correct 2 ms 3668 KB correct
5 Correct 2 ms 3668 KB correct
6 Correct 2 ms 3636 KB correct
7 Correct 3 ms 3668 KB correct
8 Correct 2 ms 3636 KB correct
9 Correct 2 ms 3668 KB correct
10 Correct 2 ms 3668 KB correct
11 Correct 2 ms 3640 KB correct
12 Correct 2 ms 3644 KB correct
13 Correct 2 ms 3636 KB correct
14 Correct 5 ms 3796 KB correct
15 Correct 4 ms 3796 KB correct
16 Correct 3 ms 3796 KB correct
17 Correct 3 ms 3776 KB correct
18 Correct 3 ms 3668 KB correct
19 Correct 4 ms 3796 KB correct
20 Correct 3 ms 3796 KB correct
21 Correct 3 ms 3796 KB correct
22 Correct 3 ms 3796 KB correct
23 Correct 3 ms 3676 KB correct
24 Correct 3 ms 3668 KB correct
25 Correct 3 ms 3640 KB correct
26 Correct 4 ms 3668 KB correct
27 Correct 4 ms 3768 KB correct
28 Correct 3 ms 3668 KB correct
29 Correct 2 ms 3668 KB correct
30 Correct 3 ms 3764 KB correct
31 Correct 3 ms 3796 KB correct
32 Correct 3 ms 3768 KB correct
33 Correct 3 ms 3796 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3668 KB correct
2 Correct 2 ms 3668 KB correct
3 Correct 2 ms 3668 KB correct
4 Correct 2 ms 3668 KB correct
5 Correct 2 ms 3668 KB correct
6 Correct 2 ms 3636 KB correct
7 Correct 3 ms 3668 KB correct
8 Correct 2 ms 3636 KB correct
9 Correct 2 ms 3668 KB correct
10 Correct 2 ms 3668 KB correct
11 Correct 2 ms 3640 KB correct
12 Correct 2 ms 3644 KB correct
13 Correct 2 ms 3636 KB correct
14 Correct 5 ms 3796 KB correct
15 Correct 4 ms 3796 KB correct
16 Correct 3 ms 3796 KB correct
17 Correct 3 ms 3776 KB correct
18 Correct 3 ms 3668 KB correct
19 Correct 4 ms 3796 KB correct
20 Correct 3 ms 3796 KB correct
21 Correct 3 ms 3796 KB correct
22 Correct 3 ms 3796 KB correct
23 Correct 3 ms 3676 KB correct
24 Correct 3 ms 3668 KB correct
25 Correct 3 ms 3640 KB correct
26 Correct 4 ms 3668 KB correct
27 Correct 4 ms 3768 KB correct
28 Correct 3 ms 3668 KB correct
29 Correct 2 ms 3668 KB correct
30 Correct 3 ms 3764 KB correct
31 Correct 3 ms 3796 KB correct
32 Correct 3 ms 3768 KB correct
33 Correct 3 ms 3796 KB correct
34 Correct 52 ms 5076 KB correct
35 Correct 60 ms 5036 KB correct
36 Correct 46 ms 4912 KB correct
37 Correct 10 ms 3796 KB correct
38 Correct 58 ms 4948 KB correct
39 Correct 53 ms 4948 KB correct
40 Correct 48 ms 4920 KB correct
41 Correct 61 ms 4960 KB correct
42 Correct 56 ms 5076 KB correct
43 Correct 25 ms 4564 KB correct
44 Correct 22 ms 4308 KB correct
45 Correct 25 ms 4436 KB correct
46 Correct 20 ms 4420 KB correct
47 Correct 14 ms 4040 KB correct
48 Correct 5 ms 3796 KB correct
49 Correct 9 ms 3772 KB correct
50 Correct 12 ms 4052 KB correct
51 Correct 24 ms 4360 KB correct
52 Correct 20 ms 4308 KB correct
53 Correct 19 ms 4308 KB correct
54 Correct 26 ms 4564 KB correct
55 Correct 23 ms 4420 KB correct
56 Correct 24 ms 4436 KB correct
57 Correct 28 ms 4436 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3668 KB correct
2 Correct 2 ms 3668 KB correct
3 Correct 216 ms 7272 KB correct
4 Correct 390 ms 8396 KB correct
5 Correct 393 ms 8508 KB correct
6 Correct 382 ms 8500 KB correct
7 Correct 359 ms 8248 KB correct
8 Correct 367 ms 8076 KB correct
9 Correct 376 ms 8300 KB correct
10 Correct 346 ms 8328 KB correct
11 Correct 382 ms 8192 KB correct
12 Correct 385 ms 8160 KB correct
13 Correct 2 ms 3668 KB correct
14 Correct 387 ms 8204 KB correct
15 Correct 359 ms 8208 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 3668 KB correct
2 Correct 2 ms 3668 KB correct
3 Correct 2 ms 3668 KB correct
4 Correct 2 ms 3668 KB correct
5 Correct 2 ms 3668 KB correct
6 Correct 2 ms 3636 KB correct
7 Correct 3 ms 3668 KB correct
8 Correct 2 ms 3636 KB correct
9 Correct 2 ms 3668 KB correct
10 Correct 2 ms 3668 KB correct
11 Correct 2 ms 3640 KB correct
12 Correct 2 ms 3644 KB correct
13 Correct 2 ms 3636 KB correct
14 Correct 5 ms 3796 KB correct
15 Correct 4 ms 3796 KB correct
16 Correct 3 ms 3796 KB correct
17 Correct 3 ms 3776 KB correct
18 Correct 3 ms 3668 KB correct
19 Correct 4 ms 3796 KB correct
20 Correct 3 ms 3796 KB correct
21 Correct 3 ms 3796 KB correct
22 Correct 3 ms 3796 KB correct
23 Correct 3 ms 3676 KB correct
24 Correct 3 ms 3668 KB correct
25 Correct 3 ms 3640 KB correct
26 Correct 4 ms 3668 KB correct
27 Correct 4 ms 3768 KB correct
28 Correct 3 ms 3668 KB correct
29 Correct 2 ms 3668 KB correct
30 Correct 3 ms 3764 KB correct
31 Correct 3 ms 3796 KB correct
32 Correct 3 ms 3768 KB correct
33 Correct 3 ms 3796 KB correct
34 Correct 52 ms 5076 KB correct
35 Correct 60 ms 5036 KB correct
36 Correct 46 ms 4912 KB correct
37 Correct 10 ms 3796 KB correct
38 Correct 58 ms 4948 KB correct
39 Correct 53 ms 4948 KB correct
40 Correct 48 ms 4920 KB correct
41 Correct 61 ms 4960 KB correct
42 Correct 56 ms 5076 KB correct
43 Correct 25 ms 4564 KB correct
44 Correct 22 ms 4308 KB correct
45 Correct 25 ms 4436 KB correct
46 Correct 20 ms 4420 KB correct
47 Correct 14 ms 4040 KB correct
48 Correct 5 ms 3796 KB correct
49 Correct 9 ms 3772 KB correct
50 Correct 12 ms 4052 KB correct
51 Correct 24 ms 4360 KB correct
52 Correct 20 ms 4308 KB correct
53 Correct 19 ms 4308 KB correct
54 Correct 26 ms 4564 KB correct
55 Correct 23 ms 4420 KB correct
56 Correct 24 ms 4436 KB correct
57 Correct 28 ms 4436 KB correct
58 Correct 2 ms 3668 KB correct
59 Correct 2 ms 3668 KB correct
60 Correct 216 ms 7272 KB correct
61 Correct 390 ms 8396 KB correct
62 Correct 393 ms 8508 KB correct
63 Correct 382 ms 8500 KB correct
64 Correct 359 ms 8248 KB correct
65 Correct 367 ms 8076 KB correct
66 Correct 376 ms 8300 KB correct
67 Correct 346 ms 8328 KB correct
68 Correct 382 ms 8192 KB correct
69 Correct 385 ms 8160 KB correct
70 Correct 2 ms 3668 KB correct
71 Correct 387 ms 8204 KB correct
72 Correct 359 ms 8208 KB correct
73 Correct 2 ms 3668 KB correct
74 Correct 371 ms 8268 KB correct
75 Correct 344 ms 8136 KB correct
76 Correct 142 ms 5532 KB correct
77 Correct 364 ms 8208 KB correct
78 Correct 383 ms 8080 KB correct
79 Correct 373 ms 8184 KB correct
80 Correct 373 ms 8160 KB correct
81 Correct 310 ms 7872 KB correct
82 Correct 363 ms 8168 KB correct
83 Correct 228 ms 6404 KB correct
84 Correct 178 ms 7032 KB correct
85 Correct 123 ms 6740 KB correct
86 Correct 101 ms 5660 KB correct
87 Correct 81 ms 5440 KB correct
88 Correct 60 ms 4896 KB correct
89 Correct 72 ms 4816 KB correct
90 Correct 69 ms 4760 KB correct
91 Correct 32 ms 3924 KB correct
92 Correct 14 ms 3796 KB correct
93 Correct 142 ms 6756 KB correct
94 Correct 97 ms 5632 KB correct
95 Correct 99 ms 5748 KB correct
96 Correct 61 ms 4824 KB correct
97 Correct 69 ms 4892 KB correct
98 Correct 77 ms 5384 KB correct
99 Correct 66 ms 4852 KB correct
100 Correct 42 ms 4092 KB correct
101 Correct 18 ms 3864 KB correct
102 Correct 128 ms 6112 KB correct
103 Correct 156 ms 6068 KB correct
104 Correct 157 ms 6128 KB correct
105 Correct 135 ms 6116 KB correct