oj.uz

Submission #135015

# Submission time Handle Problem Language Result Execution time Memory
135015 2019-07-23T14:22:13 Z nvmdava Simurgh (IOI17_simurgh) C++17
100 / 100
 751 ms 4984 KB 
#include "simurgh.h"
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define vi vector<int>

vector<pair<int, int> > edge;
bool ans[150000], ch[150000], in[505];
vi inq, tr, adj[505], vall, qq, ret, cyc, fin, onn, off;

int p[505], t, par[505], dep[505], n, m;

int get(int v, int i){
	return edge[i].ff + edge[i].ss - v;
}

void reset(){
	for(int i = 0; i < n; i++)
		p[i] = i;
}

int find(int v){
	return v == p[v] ? v : p[v] = find(p[v]);
}

bool merge(int v, int u){
	v = find(v);
	u = find(u);
	if(v == u) return 0;
	p[v] = u;
	return 1;
}

int ask(){
	reset();
	for(int& x : inq)
		merge(edge[x].ff, edge[x].ss);
	t = 0;
	for(int& x : tr){
		if(merge(edge[x].ff, edge[x].ss)){
			inq.pb(x);
			t += ans[x];
		}
	}
	return count_common_roads(inq);
}

void dfs(int v){
	for(int& x : adj[v]){
		int u = get(v, x);
		if(dep[u]) continue;
		par[u] = x;
		dep[u] = dep[v] + 1;
		tr.pb(x);
		dfs(u);
	}
}

int fillexc(int x){
	inq = cyc;
	for(int& a : inq){
		if(a == x){
			swap(a, inq.back());
			inq.pop_back();
			break;
		}
	}
	return ask();
}

void cycle(){
	if(fin.empty()) return;
   int lo;
	if(onn.empty() && off.empty()){
		lo = -1;
		vall.clear();
		for(int& x : cyc)
			vall.pb(fillexc(x));
		for(int& x : vall)
			lo = max(lo, x);
		for(int i = cyc.size() - 1; i >= 0; i--){
			ch[cyc[i]] = 1;
			ans[cyc[i]] = (lo - vall[i]);
		}
	} else {
		if(off.empty())
			lo = fillexc(onn[0]);
		else
			lo = fillexc(off[0]) - 1;
		for(int& x : fin){
			ch[x] = 1;
			ans[x] = (fillexc(x) == lo);
		}
	}
}

void tree(){
	for(int i = 0; i < m; i++){
		if(dep[edge[i].ff] < dep[edge[i].ss]) swap(edge[i].ff, edge[i].ss);
		if(dep[edge[i].ff] - dep[edge[i].ss] == 1) continue;
		cyc.clear(); fin.clear(); off.clear(); onn.clear();
		cyc.pb(i);
		int s = edge[i].ff;
		while(s != edge[i].ss){
			cyc.pb(par[s]);
			if(ch[par[s]] == 0) fin.pb(par[s]);
			else if(ans[par[s]] == 1) onn.pb(par[s]);
			else off.pb(par[s]);
			s = get(s, par[s]);
		}
		cycle();
	}
	for(int& x : tr){
		if(ch[x] == 0){
			ch[x] = ans[x] = 1;
		}
	}
}

void dfs2(int v){
	in[v] = 1;
	for(int i = adj[v].size() - 1; i >= 0; i--){
		if(ch[adj[v][i]]){
			swap(adj[v][i], adj[v].back());
			adj[v].pop_back();
			continue;
		}
		int u = get(v, adj[v][i]);
		if(in[u]) continue;
		qq.pb(adj[v][i]);
		dfs2(u);
	}
}

void vsolve(){
	if(qq.empty()) return;
	inq = qq;
	if(ask() == t){
		for(int& x : qq){
			ch[x] = 1;
			ans[x] = 0;
		}
		return;
	}
	int l = 0, r = qq.size() - 1;
	while(l != r){
		int m = (l + r) >> 1;
		inq.clear();
		for(int i = 0; i <= m; i++)
			inq.pb(qq[i]);
		if(ask() == t) l = m + 1;
		else r = m;
	}
	for(int i = 0; i < r; i++){
		ch[qq[i]] = 1;
		ans[qq[i]] = 0;
	}
	ch[qq[r]] = ans[qq[r]] = 1;
}


vi find_roads(int N, vi u, vi v) {
	n = N;
	m = u.size();
	for(int i = 0; i < m; i++){
		adj[v[i]].pb(i);
		adj[u[i]].pb(i);
		edge.pb({v[i], u[i]});
	}
	dep[0] = 1;
	dfs(0);
	tree();
	do{
		memset(in, 0, sizeof in);
		qq.clear();
		for(int i = 0; i < n; i++){
			if(in[i]) continue;
			dfs2(i);
		}
		vsolve();
	} while(!qq.empty());
	for(int i = 0; i < m; i++){
		if(ans[i]) ret.pb(i);
	}
	return ret;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 2 ms 376 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 380 KB correct
11 Correct 2 ms 348 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 2 ms 376 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 380 KB correct
11 Correct 2 ms 348 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 380 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 4 ms 376 KB correct
20 Correct 4 ms 376 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 376 KB correct
24 Correct 3 ms 376 KB correct
25 Correct 2 ms 376 KB correct
26 Correct 3 ms 376 KB correct
27 Correct 3 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 1 ms 420 KB correct
32 Correct 3 ms 416 KB correct
33 Correct 3 ms 376 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 2 ms 376 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 380 KB correct
11 Correct 2 ms 348 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 380 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 4 ms 376 KB correct
20 Correct 4 ms 376 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 376 KB correct
24 Correct 3 ms 376 KB correct
25 Correct 2 ms 376 KB correct
26 Correct 3 ms 376 KB correct
27 Correct 3 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 1 ms 420 KB correct
32 Correct 3 ms 416 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 92 ms 1512 KB correct
35 Correct 91 ms 1388 KB correct
36 Correct 71 ms 1176 KB correct
37 Correct 25 ms 376 KB correct
38 Correct 93 ms 1396 KB correct
39 Correct 81 ms 1308 KB correct
40 Correct 70 ms 1144 KB correct
41 Correct 88 ms 1396 KB correct
42 Correct 88 ms 1396 KB correct
43 Correct 30 ms 1016 KB correct
44 Correct 25 ms 888 KB correct
45 Correct 28 ms 876 KB correct
46 Correct 24 ms 888 KB correct
47 Correct 15 ms 632 KB correct
48 Correct 5 ms 376 KB correct
49 Correct 10 ms 380 KB correct
50 Correct 15 ms 632 KB correct
51 Correct 29 ms 888 KB correct
52 Correct 25 ms 888 KB correct
53 Correct 24 ms 760 KB correct
54 Correct 30 ms 1016 KB correct
55 Correct 31 ms 888 KB correct
56 Correct 31 ms 760 KB correct
57 Correct 30 ms 888 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 395 ms 3572 KB correct
4 Correct 751 ms 4844 KB correct
5 Correct 740 ms 4808 KB correct
6 Correct 669 ms 4836 KB correct
7 Correct 656 ms 4720 KB correct
8 Correct 672 ms 4892 KB correct
9 Correct 727 ms 4716 KB correct
10 Correct 729 ms 4844 KB correct
11 Correct 746 ms 4704 KB correct
12 Correct 735 ms 4836 KB correct
13 Correct 2 ms 380 KB correct
14 Correct 710 ms 4824 KB correct
15 Correct 720 ms 4984 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 2 ms 376 KB correct
4 Correct 2 ms 376 KB correct
5 Correct 2 ms 376 KB correct
6 Correct 2 ms 376 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 376 KB correct
9 Correct 2 ms 376 KB correct
10 Correct 2 ms 380 KB correct
11 Correct 2 ms 348 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 4 ms 376 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 380 KB correct
18 Correct 3 ms 376 KB correct
19 Correct 4 ms 376 KB correct
20 Correct 4 ms 376 KB correct
21 Correct 4 ms 376 KB correct
22 Correct 3 ms 348 KB correct
23 Correct 3 ms 376 KB correct
24 Correct 3 ms 376 KB correct
25 Correct 2 ms 376 KB correct
26 Correct 3 ms 376 KB correct
27 Correct 3 ms 376 KB correct
28 Correct 3 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 1 ms 420 KB correct
32 Correct 3 ms 416 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 92 ms 1512 KB correct
35 Correct 91 ms 1388 KB correct
36 Correct 71 ms 1176 KB correct
37 Correct 25 ms 376 KB correct
38 Correct 93 ms 1396 KB correct
39 Correct 81 ms 1308 KB correct
40 Correct 70 ms 1144 KB correct
41 Correct 88 ms 1396 KB correct
42 Correct 88 ms 1396 KB correct
43 Correct 30 ms 1016 KB correct
44 Correct 25 ms 888 KB correct
45 Correct 28 ms 876 KB correct
46 Correct 24 ms 888 KB correct
47 Correct 15 ms 632 KB correct
48 Correct 5 ms 376 KB correct
49 Correct 10 ms 380 KB correct
50 Correct 15 ms 632 KB correct
51 Correct 29 ms 888 KB correct
52 Correct 25 ms 888 KB correct
53 Correct 24 ms 760 KB correct
54 Correct 30 ms 1016 KB correct
55 Correct 31 ms 888 KB correct
56 Correct 31 ms 760 KB correct
57 Correct 30 ms 888 KB correct
58 Correct 2 ms 376 KB correct
59 Correct 2 ms 376 KB correct
60 Correct 395 ms 3572 KB correct
61 Correct 751 ms 4844 KB correct
62 Correct 740 ms 4808 KB correct
63 Correct 669 ms 4836 KB correct
64 Correct 656 ms 4720 KB correct
65 Correct 672 ms 4892 KB correct
66 Correct 727 ms 4716 KB correct
67 Correct 729 ms 4844 KB correct
68 Correct 746 ms 4704 KB correct
69 Correct 735 ms 4836 KB correct
70 Correct 2 ms 380 KB correct
71 Correct 710 ms 4824 KB correct
72 Correct 720 ms 4984 KB correct
73 Correct 2 ms 380 KB correct
74 Correct 725 ms 4972 KB correct
75 Correct 706 ms 4844 KB correct
76 Correct 239 ms 2036 KB correct
77 Correct 711 ms 4980 KB correct
78 Correct 713 ms 4708 KB correct
79 Correct 729 ms 4696 KB correct
80 Correct 692 ms 4716 KB correct
81 Correct 584 ms 4252 KB correct
82 Correct 702 ms 4788 KB correct
83 Correct 400 ms 2808 KB correct
84 Correct 230 ms 3444 KB correct
85 Correct 200 ms 3112 KB correct
86 Correct 129 ms 2104 KB correct
87 Correct 104 ms 1652 KB correct
88 Correct 84 ms 1396 KB correct
89 Correct 87 ms 1272 KB correct
90 Correct 73 ms 1144 KB correct
91 Correct 36 ms 504 KB correct
92 Correct 16 ms 376 KB correct
93 Correct 193 ms 3032 KB correct
94 Correct 127 ms 2160 KB correct
95 Correct 122 ms 2164 KB correct
96 Correct 81 ms 1324 KB correct
97 Correct 88 ms 1340 KB correct
98 Correct 95 ms 1780 KB correct
99 Correct 83 ms 1272 KB correct
100 Correct 50 ms 760 KB correct
101 Correct 23 ms 376 KB correct
102 Correct 210 ms 2648 KB correct
103 Correct 211 ms 2648 KB correct
104 Correct 202 ms 2672 KB correct
105 Correct 195 ms 2544 KB correct