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Submission #963636

# Submission time Handle Problem Language Result Execution time Memory
963636 2024-04-15T12:11:48 Z Itamar Simurgh (IOI17_simurgh) C++14
100 / 100
 113 ms 7516 KB 
using namespace std;
#include <vector>
#define vi vector<int>
#include "simurgh.h"
#define pi pair<int,int>
#include <random>
#define x first
#define y second
const int siz = 501;

int ans[siz][siz];
int in[siz][siz];
vi fr[siz];
int h[siz];
int pad[siz];
vi u, v;
int n;
bool vis[siz];
vi tr;
int m;
void dfs(int i) {
	if (vis[i])return;
	vis[i] = 1;
	for (int f : fr[i]) {
		if (!vis[f]) {
			h[f] = h[i] + 1;
			pad[f] = i;
			tr.push_back(in[i][f]);
			dfs(f);
		}
	}
}
static int find(int node, vi&parent) {
	return (parent[node] == node ? node : parent[node] = find(parent[node],parent));
}

static bool merge(int v1, int v2, vi& parent, vi& siz) {
	v1 = find(v1,parent);
	v2 = find(v2,parent);
	if (v1 == v2)
		return false;
	if (siz[v1] > siz[v2])swap(v1, v2);
	parent[v1] = v2;
	if (siz[v1] == siz[v2])siz[v2]++;
	return true;
}
int common(vi ed) {
	int mi = 0;
	vi q = ed;
	vi parent(n); for (int i = 0; i < n; i++)parent[i] = i;
	vi siz(n);
	for (int i : ed)merge(u[i], v[i],parent,siz);
	for (int i : tr) {
		if (merge(u[i], v[i], parent, siz)) {
			if(ans[u[i]][v[i]]==1)mi++;
			q.push_back(i);
		}
	}
	return count_common_roads(q) - mi;
}
void check(vi ed, int f) {
	if (ed.size() == 1) {
		ans[u[ed[0]]][v[ed[0]]] = 1;
		return;
	}
	int s = ed.size();
	vi vec1, vec2; 
	for (int i = 0; i < s; i++) {
		if (i < s / 2)vec1.push_back(ed[i]);
		else vec2.push_back(ed[i]);
	}
	int h = common(vec1);
	if (h>0) {
		check(vec1, h);
	}
	if (f-h>0)check(vec2, f-h);
}
vi find_roads(int N, vi U, vi V) {
	u = U, v = V;
	n = N;
	m = u.size();
	for (int i = 0; i < m; i++) {
		fr[u[i]].push_back(v[i]);
		fr[v[i]].push_back(u[i]);
		ans[u[i]][v[i]] = -1;
		ans[v[i]][u[i]] = -1;
		in[u[i]][v[i]] = i;
		in[v[i]][u[i]] = i;
	}
	dfs(0);
	int a = count_common_roads(tr);

	for (int i = 0; i < n; i++) {
		pi p={1e9,1e9};
		for (int j : fr[i]) {
			p = min(p, { h[j],j });
		}
		vi cyc = {in[i][p.y]};
		if (p.x >= h[i] - 1)continue;
		int t = i;
		while (t != p.y) {
			cyc.push_back({ in[t][pad[t]] });
			t = pad[t];
		}
		vi can = { a };
		vi ts(2,-1);
		for (int ed : cyc) {
			if (ed == cyc[0])continue;
			vi q = {cyc[0]};
			if (ans[u[ed]][v[ed]] != -1 && ts[ans[u[ed]][v[ed]]] != -1) {
				can.push_back(ts[ans[u[ed]][v[ed]]]); continue;
			}
			for (int j : tr) {
				if (j != ed) {
					q.push_back(j);
				}
			}
			int b = count_common_roads(q);
			can.push_back(b);
			if (ans[u[ed]][v[ed]] != -1)ts[ans[u[ed]][v[ed]]] = b;
		}
		int maxi = a; 
		for (int j : can)maxi = max(j, maxi);
		for (int j = 0; j < can.size(); j++) {
			if (can[j] < maxi) {
				ans[u[cyc[j]]][v[cyc[j]]] = 1;
			}
			else ans[u[cyc[j]]][v[cyc[j]]] = 0;
		}
	}
	for (int i : tr)if (ans[u[i]][v[i]] == -1)ans[u[i]][v[i]] = 1;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (ans[i][j] != -1)ans[j][i] = ans[i][j];
		}
	}

	for (int d = 1; d < n; d++) {
		vi vec;
		for (int i = 0; i + d < n; i++) {
			if (ans[i][i + d] == -1)vec.push_back(in[i][i + d]);
		}
		int h = common(vec);
		if(h)check(vec,h);
	}

	vi res;
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			if (ans[i][j] == 1 || ans[j][i] == 1)res.push_back(in[i][j]);
		}
	}
	return res;
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:124:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |   for (int j = 0; j < can.size(); j++) {
      |                   ~~^~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 704 KB correct
4 Correct 0 ms 604 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 1 ms 448 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 704 KB correct
4 Correct 0 ms 604 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 1 ms 448 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 604 KB correct
15 Correct 1 ms 604 KB correct
16 Correct 1 ms 604 KB correct
17 Correct 1 ms 604 KB correct
18 Correct 1 ms 604 KB correct
19 Correct 1 ms 604 KB correct
20 Correct 1 ms 604 KB correct
21 Correct 1 ms 604 KB correct
22 Correct 1 ms 452 KB correct
23 Correct 1 ms 604 KB correct
24 Correct 1 ms 448 KB correct
25 Correct 1 ms 600 KB correct
26 Correct 1 ms 604 KB correct
27 Correct 1 ms 600 KB correct
28 Correct 1 ms 604 KB correct
29 Correct 1 ms 604 KB correct
30 Correct 1 ms 604 KB correct
31 Correct 1 ms 604 KB correct
32 Correct 1 ms 456 KB correct
33 Correct 1 ms 604 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 704 KB correct
4 Correct 0 ms 604 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 1 ms 448 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 604 KB correct
15 Correct 1 ms 604 KB correct
16 Correct 1 ms 604 KB correct
17 Correct 1 ms 604 KB correct
18 Correct 1 ms 604 KB correct
19 Correct 1 ms 604 KB correct
20 Correct 1 ms 604 KB correct
21 Correct 1 ms 604 KB correct
22 Correct 1 ms 452 KB correct
23 Correct 1 ms 604 KB correct
24 Correct 1 ms 448 KB correct
25 Correct 1 ms 600 KB correct
26 Correct 1 ms 604 KB correct
27 Correct 1 ms 600 KB correct
28 Correct 1 ms 604 KB correct
29 Correct 1 ms 604 KB correct
30 Correct 1 ms 604 KB correct
31 Correct 1 ms 604 KB correct
32 Correct 1 ms 456 KB correct
33 Correct 1 ms 604 KB correct
34 Correct 20 ms 2600 KB correct
35 Correct 19 ms 2396 KB correct
36 Correct 17 ms 2296 KB correct
37 Correct 6 ms 1372 KB correct
38 Correct 19 ms 2396 KB correct
39 Correct 18 ms 2344 KB correct
40 Correct 18 ms 2248 KB correct
41 Correct 20 ms 2404 KB correct
42 Correct 25 ms 2592 KB correct
43 Correct 12 ms 2140 KB correct
44 Correct 11 ms 1948 KB correct
45 Correct 11 ms 1884 KB correct
46 Correct 10 ms 1888 KB correct
47 Correct 7 ms 1628 KB correct
48 Correct 3 ms 1372 KB correct
49 Correct 5 ms 1372 KB correct
50 Correct 7 ms 1628 KB correct
51 Correct 12 ms 1992 KB correct
52 Correct 16 ms 1880 KB correct
53 Correct 10 ms 1884 KB correct
54 Correct 15 ms 2096 KB correct
55 Correct 11 ms 1904 KB correct
56 Correct 11 ms 1880 KB correct
57 Correct 10 ms 2136 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 53 ms 5204 KB correct
4 Correct 102 ms 7484 KB correct
5 Correct 96 ms 7248 KB correct
6 Correct 90 ms 7484 KB correct
7 Correct 97 ms 7484 KB correct
8 Correct 96 ms 7256 KB correct
9 Correct 96 ms 7472 KB correct
10 Correct 86 ms 7516 KB correct
11 Correct 88 ms 7496 KB correct
12 Correct 93 ms 7484 KB correct
13 Correct 1 ms 348 KB correct
14 Correct 113 ms 7432 KB correct
15 Correct 86 ms 7256 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB correct
2 Correct 0 ms 348 KB correct
3 Correct 1 ms 704 KB correct
4 Correct 0 ms 604 KB correct
5 Correct 0 ms 348 KB correct
6 Correct 0 ms 348 KB correct
7 Correct 0 ms 348 KB correct
8 Correct 0 ms 348 KB correct
9 Correct 0 ms 348 KB correct
10 Correct 1 ms 348 KB correct
11 Correct 1 ms 448 KB correct
12 Correct 0 ms 348 KB correct
13 Correct 0 ms 348 KB correct
14 Correct 1 ms 604 KB correct
15 Correct 1 ms 604 KB correct
16 Correct 1 ms 604 KB correct
17 Correct 1 ms 604 KB correct
18 Correct 1 ms 604 KB correct
19 Correct 1 ms 604 KB correct
20 Correct 1 ms 604 KB correct
21 Correct 1 ms 604 KB correct
22 Correct 1 ms 452 KB correct
23 Correct 1 ms 604 KB correct
24 Correct 1 ms 448 KB correct
25 Correct 1 ms 600 KB correct
26 Correct 1 ms 604 KB correct
27 Correct 1 ms 600 KB correct
28 Correct 1 ms 604 KB correct
29 Correct 1 ms 604 KB correct
30 Correct 1 ms 604 KB correct
31 Correct 1 ms 604 KB correct
32 Correct 1 ms 456 KB correct
33 Correct 1 ms 604 KB correct
34 Correct 20 ms 2600 KB correct
35 Correct 19 ms 2396 KB correct
36 Correct 17 ms 2296 KB correct
37 Correct 6 ms 1372 KB correct
38 Correct 19 ms 2396 KB correct
39 Correct 18 ms 2344 KB correct
40 Correct 18 ms 2248 KB correct
41 Correct 20 ms 2404 KB correct
42 Correct 25 ms 2592 KB correct
43 Correct 12 ms 2140 KB correct
44 Correct 11 ms 1948 KB correct
45 Correct 11 ms 1884 KB correct
46 Correct 10 ms 1888 KB correct
47 Correct 7 ms 1628 KB correct
48 Correct 3 ms 1372 KB correct
49 Correct 5 ms 1372 KB correct
50 Correct 7 ms 1628 KB correct
51 Correct 12 ms 1992 KB correct
52 Correct 16 ms 1880 KB correct
53 Correct 10 ms 1884 KB correct
54 Correct 15 ms 2096 KB correct
55 Correct 11 ms 1904 KB correct
56 Correct 11 ms 1880 KB correct
57 Correct 10 ms 2136 KB correct
58 Correct 1 ms 348 KB correct
59 Correct 0 ms 348 KB correct
60 Correct 53 ms 5204 KB correct
61 Correct 102 ms 7484 KB correct
62 Correct 96 ms 7248 KB correct
63 Correct 90 ms 7484 KB correct
64 Correct 97 ms 7484 KB correct
65 Correct 96 ms 7256 KB correct
66 Correct 96 ms 7472 KB correct
67 Correct 86 ms 7516 KB correct
68 Correct 88 ms 7496 KB correct
69 Correct 93 ms 7484 KB correct
70 Correct 1 ms 348 KB correct
71 Correct 113 ms 7432 KB correct
72 Correct 86 ms 7256 KB correct
73 Correct 0 ms 348 KB correct
74 Correct 86 ms 7260 KB correct
75 Correct 88 ms 7260 KB correct
76 Correct 47 ms 4208 KB correct
77 Correct 90 ms 7512 KB correct
78 Correct 86 ms 7484 KB correct
79 Correct 96 ms 7432 KB correct
80 Correct 85 ms 7260 KB correct
81 Correct 93 ms 7000 KB correct
82 Correct 93 ms 7400 KB correct
83 Correct 66 ms 4952 KB correct
84 Correct 61 ms 5664 KB correct
85 Correct 61 ms 5600 KB correct
86 Correct 42 ms 4156 KB correct
87 Correct 38 ms 3928 KB correct
88 Correct 40 ms 3504 KB correct
89 Correct 34 ms 3420 KB correct
90 Correct 37 ms 3160 KB correct
91 Correct 15 ms 2392 KB correct
92 Correct 10 ms 2396 KB correct
93 Correct 63 ms 5420 KB correct
94 Correct 42 ms 4188 KB correct
95 Correct 42 ms 4364 KB correct
96 Correct 37 ms 3160 KB correct
97 Correct 35 ms 3568 KB correct
98 Correct 38 ms 3944 KB correct
99 Correct 35 ms 3532 KB correct
100 Correct 20 ms 2648 KB correct
101 Correct 10 ms 2396 KB correct
102 Correct 44 ms 5028 KB correct
103 Correct 56 ms 5028 KB correct
104 Correct 44 ms 5008 KB correct
105 Correct 45 ms 4972 KB correct