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Submission #250695

# Submission time Handle Problem Language Result Execution time Memory
250695 2020-07-18T18:27:02 Z srvlt Simurgh (IOI17_simurgh) C++14
100 / 100
 1098 ms 7352 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define ld long double
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define SZ(x) (int)(x).size()
template <typename T> using ord_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int n0 = 503, m0 = 125000;
int N, M, used[n0], par[n0], ch[m0], same[m0], ep[m0];
int in[n0], out[n0], T, S;
vector <int> g[n0], V, U, query, back[n0];
set <int> st;

void add(int x) {
	st.insert(x);
}

void del(int x) {
	st.erase(x);
}

bool ex(int x) {
	return st.find(x) != st.end();
}

int ask() {
	query.clear();
	for (int i : st) query.pb(i);
	return count_common_roads(query);
}

void dfs(int v) {
	used[v] = 1;
	in[v] = ++T;
	for (int i : g[v]) {
		int to = V[i] ^ U[i] ^ v;
		if (used[to]) continue;
		par[to] = i;
		add(i);
		dfs(to);
	}
	out[v] = T;
}

bool upper(int x, int y) {
	return in[x] <= in[y] && out[y] <= out[x];
}

bool cmp(const int & x, const int & y) {
	if (x == y) return false;
	return upper(ep[y], ep[x]);
}

int get(int v, int k) {
	int u = v, res = S;
	for (int i = 0; i <= k; i++) {
		int j = back[v][i];
		int to = V[j] ^ U[j] ^ v;
		add(j), del(par[u]);
		if (ch[par[u]] == 1) {
			res--;
		}
		u = to;
	}
	res = ask() - res;
	u = v;
	for (int i = 0; i <= k; i++) {
		int j = back[v][i];
		int to = V[j] ^ U[j] ^ v;
		del(j), add(par[u]);
		u = to;
	}
	return res;
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
	N = n, M = SZ(u), V = v, U = u;
	for (int i = 0; i < M; i++)
		g[v[i]].pb(i), g[u[i]].pb(i);
	memset(& ch, -1, sizeof(ch));
	par[0] = -1;
	dfs(0);
	vector <int> path;
	S = ask();
	for (int i = 0; i < M; i++) {
		if (ex(i)) continue;
		int a = v[i], b = u[i];
		if (upper(b, a)) swap(a, b);
		assert(upper(a, b));
		int ok = 0;
		path.clear();
		while (b != a) {
			path.pb(par[b]);
			if (ch[par[b]] == -1) ok = 1;
			b = v[par[b]] ^ u[par[b]] ^ b;
		}
		if (!ok) continue;
		add(i);
		for (int j : path) {
			if (ch[i] != -1 && ch[j] != -1) continue;
			del(j);
			int x = ask();
			if (x == S) {
				same[j] = 1;
				if (ch[j] != -1) ch[i] = ch[j];
			}	else if (x == S + 1) {
				ch[i] = 1;
				ch[j] = 0;
			}	else {
				ch[i] = 0;
				ch[j] = 1;
			}
			add(j);
		}
		del(i);
		if (ch[i] == -1) ch[i] = 0;
		for (int j : path) {
			if (same[j]) ch[j] = ch[i];
			same[j] = 0;
		}
	}
	for (int i = 0; i < M; i++)
		if (ex(i) && ch[i] == -1) ch[i] = 1;
	for (int i = 0; i < N; i++) {
		for (int j : g[i]) {
			if (!ex(j)) {
				int to = v[j] ^ u[j] ^ i;
				if (upper(to, i)) {
					ep[j] = to;
					back[i].pb(j);
				}
			}
		}
		sort(all(back[i]), cmp);
		int cur = -1, have = 0;
		while (true) {
			int l = cur, r = SZ(back[i]);
			while (l < r - 1) {
				int mid = l + r >> 1;
				if (get(i, mid) > have) {
					r = mid;
				}	else {
					l = mid;
				}
			}
			cur = r;
			if (r < SZ(back[i])) {
				ch[back[i][r]] = 1;
				have++;
			}	else break;
		}
	}
	vector <int> res;
	for (int i = 0; i < M; i++) {
		if (ch[i] == -1) ch[i] = 0;
		if (ch[i] == 1) res.pb(i);
	}
	return res;
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:146:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r >> 1;
               ~~^~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 896 KB correct
2 Correct 1 ms 896 KB correct
3 Correct 1 ms 896 KB correct
4 Correct 1 ms 896 KB correct
5 Correct 1 ms 896 KB correct
6 Correct 1 ms 896 KB correct
7 Correct 1 ms 896 KB correct
8 Correct 1 ms 896 KB correct
9 Correct 1 ms 896 KB correct
10 Correct 1 ms 896 KB correct
11 Correct 1 ms 792 KB correct
12 Correct 1 ms 896 KB correct
13 Correct 1 ms 896 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 896 KB correct
2 Correct 1 ms 896 KB correct
3 Correct 1 ms 896 KB correct
4 Correct 1 ms 896 KB correct
5 Correct 1 ms 896 KB correct
6 Correct 1 ms 896 KB correct
7 Correct 1 ms 896 KB correct
8 Correct 1 ms 896 KB correct
9 Correct 1 ms 896 KB correct
10 Correct 1 ms 896 KB correct
11 Correct 1 ms 792 KB correct
12 Correct 1 ms 896 KB correct
13 Correct 1 ms 896 KB correct
14 Correct 5 ms 896 KB correct
15 Correct 6 ms 896 KB correct
16 Correct 6 ms 896 KB correct
17 Correct 4 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 4 ms 896 KB correct
20 Correct 4 ms 896 KB correct
21 Correct 4 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 2 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 1 ms 896 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 3 ms 896 KB correct
28 Correct 1 ms 896 KB correct
29 Correct 1 ms 896 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 3 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 3 ms 896 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 896 KB correct
2 Correct 1 ms 896 KB correct
3 Correct 1 ms 896 KB correct
4 Correct 1 ms 896 KB correct
5 Correct 1 ms 896 KB correct
6 Correct 1 ms 896 KB correct
7 Correct 1 ms 896 KB correct
8 Correct 1 ms 896 KB correct
9 Correct 1 ms 896 KB correct
10 Correct 1 ms 896 KB correct
11 Correct 1 ms 792 KB correct
12 Correct 1 ms 896 KB correct
13 Correct 1 ms 896 KB correct
14 Correct 5 ms 896 KB correct
15 Correct 6 ms 896 KB correct
16 Correct 6 ms 896 KB correct
17 Correct 4 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 4 ms 896 KB correct
20 Correct 4 ms 896 KB correct
21 Correct 4 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 2 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 1 ms 896 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 3 ms 896 KB correct
28 Correct 1 ms 896 KB correct
29 Correct 1 ms 896 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 3 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 3 ms 896 KB correct
34 Correct 193 ms 2356 KB correct
35 Correct 183 ms 2296 KB correct
36 Correct 123 ms 1912 KB correct
37 Correct 11 ms 1024 KB correct
38 Correct 181 ms 2296 KB correct
39 Correct 151 ms 2168 KB correct
40 Correct 121 ms 1956 KB correct
41 Correct 208 ms 2300 KB correct
42 Correct 175 ms 2296 KB correct
43 Correct 73 ms 1664 KB correct
44 Correct 64 ms 1528 KB correct
45 Correct 69 ms 1656 KB correct
46 Correct 53 ms 1468 KB correct
47 Correct 24 ms 1152 KB correct
48 Correct 4 ms 896 KB correct
49 Correct 10 ms 896 KB correct
50 Correct 24 ms 1152 KB correct
51 Correct 69 ms 1568 KB correct
52 Correct 63 ms 1528 KB correct
53 Correct 52 ms 1408 KB correct
54 Correct 77 ms 1784 KB correct
55 Correct 69 ms 1528 KB correct
56 Correct 72 ms 1588 KB correct
57 Correct 71 ms 1656 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 896 KB correct
2 Correct 1 ms 896 KB correct
3 Correct 638 ms 5132 KB correct
4 Correct 1091 ms 7160 KB correct
5 Correct 1092 ms 7216 KB correct
6 Correct 1098 ms 7032 KB correct
7 Correct 998 ms 7012 KB correct
8 Correct 1058 ms 7288 KB correct
9 Correct 1087 ms 7268 KB correct
10 Correct 1093 ms 7160 KB correct
11 Correct 1084 ms 7160 KB correct
12 Correct 1096 ms 7056 KB correct
13 Correct 1 ms 896 KB correct
14 Correct 1062 ms 7272 KB correct
15 Correct 1055 ms 7160 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 896 KB correct
2 Correct 1 ms 896 KB correct
3 Correct 1 ms 896 KB correct
4 Correct 1 ms 896 KB correct
5 Correct 1 ms 896 KB correct
6 Correct 1 ms 896 KB correct
7 Correct 1 ms 896 KB correct
8 Correct 1 ms 896 KB correct
9 Correct 1 ms 896 KB correct
10 Correct 1 ms 896 KB correct
11 Correct 1 ms 792 KB correct
12 Correct 1 ms 896 KB correct
13 Correct 1 ms 896 KB correct
14 Correct 5 ms 896 KB correct
15 Correct 6 ms 896 KB correct
16 Correct 6 ms 896 KB correct
17 Correct 4 ms 896 KB correct
18 Correct 2 ms 896 KB correct
19 Correct 4 ms 896 KB correct
20 Correct 4 ms 896 KB correct
21 Correct 4 ms 896 KB correct
22 Correct 3 ms 896 KB correct
23 Correct 2 ms 896 KB correct
24 Correct 3 ms 896 KB correct
25 Correct 1 ms 896 KB correct
26 Correct 2 ms 896 KB correct
27 Correct 3 ms 896 KB correct
28 Correct 1 ms 896 KB correct
29 Correct 1 ms 896 KB correct
30 Correct 2 ms 896 KB correct
31 Correct 3 ms 896 KB correct
32 Correct 3 ms 896 KB correct
33 Correct 3 ms 896 KB correct
34 Correct 193 ms 2356 KB correct
35 Correct 183 ms 2296 KB correct
36 Correct 123 ms 1912 KB correct
37 Correct 11 ms 1024 KB correct
38 Correct 181 ms 2296 KB correct
39 Correct 151 ms 2168 KB correct
40 Correct 121 ms 1956 KB correct
41 Correct 208 ms 2300 KB correct
42 Correct 175 ms 2296 KB correct
43 Correct 73 ms 1664 KB correct
44 Correct 64 ms 1528 KB correct
45 Correct 69 ms 1656 KB correct
46 Correct 53 ms 1468 KB correct
47 Correct 24 ms 1152 KB correct
48 Correct 4 ms 896 KB correct
49 Correct 10 ms 896 KB correct
50 Correct 24 ms 1152 KB correct
51 Correct 69 ms 1568 KB correct
52 Correct 63 ms 1528 KB correct
53 Correct 52 ms 1408 KB correct
54 Correct 77 ms 1784 KB correct
55 Correct 69 ms 1528 KB correct
56 Correct 72 ms 1588 KB correct
57 Correct 71 ms 1656 KB correct
58 Correct 1 ms 896 KB correct
59 Correct 1 ms 896 KB correct
60 Correct 638 ms 5132 KB correct
61 Correct 1091 ms 7160 KB correct
62 Correct 1092 ms 7216 KB correct
63 Correct 1098 ms 7032 KB correct
64 Correct 998 ms 7012 KB correct
65 Correct 1058 ms 7288 KB correct
66 Correct 1087 ms 7268 KB correct
67 Correct 1093 ms 7160 KB correct
68 Correct 1084 ms 7160 KB correct
69 Correct 1096 ms 7056 KB correct
70 Correct 1 ms 896 KB correct
71 Correct 1062 ms 7272 KB correct
72 Correct 1055 ms 7160 KB correct
73 Correct 1 ms 896 KB correct
74 Correct 1097 ms 7296 KB correct
75 Correct 1049 ms 6924 KB correct
76 Correct 359 ms 3292 KB correct
77 Correct 1094 ms 7352 KB correct
78 Correct 1079 ms 7008 KB correct
79 Correct 1062 ms 7160 KB correct
80 Correct 1031 ms 6976 KB correct
81 Correct 837 ms 6264 KB correct
82 Correct 1031 ms 6904 KB correct
83 Correct 506 ms 4088 KB correct
84 Correct 480 ms 4856 KB correct
85 Correct 414 ms 4712 KB correct
86 Correct 282 ms 3452 KB correct
87 Correct 201 ms 2684 KB correct
88 Correct 157 ms 2168 KB correct
89 Correct 156 ms 2504 KB correct
90 Correct 130 ms 1912 KB correct
91 Correct 31 ms 1024 KB correct
92 Correct 14 ms 896 KB correct
93 Correct 418 ms 4472 KB correct
94 Correct 281 ms 3324 KB correct
95 Correct 260 ms 3192 KB correct
96 Correct 138 ms 2040 KB correct
97 Correct 158 ms 2168 KB correct
98 Correct 190 ms 2680 KB correct
99 Correct 164 ms 2296 KB correct
100 Correct 57 ms 1272 KB correct
101 Correct 14 ms 896 KB correct
102 Correct 400 ms 3960 KB correct
103 Correct 405 ms 4088 KB correct
104 Correct 391 ms 3960 KB correct
105 Correct 400 ms 3960 KB correct