oj.uz

답안 #135022

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
135022 2019-07-23T14:28:55 Z nvmdava Simurgh (IOI17_simurgh) C++17
100 / 100
 740 ms 4980 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])
			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])
            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

# 결과 실행 시간 메모리 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 376 KB correct
11 Correct 2 ms 376 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 380 KB correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 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 376 KB correct
11 Correct 2 ms 376 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 380 KB correct
14 Correct 4 ms 380 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 380 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 380 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 2 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 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 376 KB correct
11 Correct 2 ms 376 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 380 KB correct
14 Correct 4 ms 380 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 380 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 380 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 2 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 93 ms 1432 KB correct
35 Correct 91 ms 1396 KB correct
36 Correct 69 ms 1144 KB correct
37 Correct 25 ms 456 KB correct
38 Correct 94 ms 1396 KB correct
39 Correct 82 ms 1272 KB correct
40 Correct 70 ms 1144 KB correct
41 Correct 87 ms 1396 KB correct
42 Correct 89 ms 1524 KB correct
43 Correct 30 ms 1016 KB correct
44 Correct 25 ms 888 KB correct
45 Correct 28 ms 888 KB correct
46 Correct 25 ms 888 KB correct
47 Correct 15 ms 632 KB correct
48 Correct 5 ms 504 KB correct
49 Correct 11 ms 376 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 936 KB correct
54 Correct 30 ms 1016 KB correct
55 Correct 31 ms 888 KB correct
56 Correct 31 ms 888 KB correct
57 Correct 30 ms 1016 KB correct

Subtask #4
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB correct
2 Correct 2 ms 376 KB correct
3 Correct 386 ms 3572 KB correct
4 Correct 736 ms 4840 KB correct
5 Correct 728 ms 4900 KB correct
6 Correct 676 ms 4800 KB correct
7 Correct 674 ms 4716 KB correct
8 Correct 671 ms 4688 KB correct
9 Correct 721 ms 4732 KB correct
10 Correct 720 ms 4844 KB correct
11 Correct 719 ms 4836 KB correct
12 Correct 732 ms 4856 KB correct
13 Correct 2 ms 376 KB correct
14 Correct 732 ms 4688 KB correct
15 Correct 714 ms 4844 KB correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 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 376 KB correct
11 Correct 2 ms 376 KB correct
12 Correct 2 ms 376 KB correct
13 Correct 2 ms 380 KB correct
14 Correct 4 ms 380 KB correct
15 Correct 4 ms 376 KB correct
16 Correct 4 ms 376 KB correct
17 Correct 4 ms 376 KB correct
18 Correct 3 ms 380 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 380 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 2 ms 376 KB correct
29 Correct 2 ms 376 KB correct
30 Correct 3 ms 376 KB correct
31 Correct 3 ms 376 KB correct
32 Correct 3 ms 376 KB correct
33 Correct 3 ms 376 KB correct
34 Correct 93 ms 1432 KB correct
35 Correct 91 ms 1396 KB correct
36 Correct 69 ms 1144 KB correct
37 Correct 25 ms 456 KB correct
38 Correct 94 ms 1396 KB correct
39 Correct 82 ms 1272 KB correct
40 Correct 70 ms 1144 KB correct
41 Correct 87 ms 1396 KB correct
42 Correct 89 ms 1524 KB correct
43 Correct 30 ms 1016 KB correct
44 Correct 25 ms 888 KB correct
45 Correct 28 ms 888 KB correct
46 Correct 25 ms 888 KB correct
47 Correct 15 ms 632 KB correct
48 Correct 5 ms 504 KB correct
49 Correct 11 ms 376 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 936 KB correct
54 Correct 30 ms 1016 KB correct
55 Correct 31 ms 888 KB correct
56 Correct 31 ms 888 KB correct
57 Correct 30 ms 1016 KB correct
58 Correct 2 ms 376 KB correct
59 Correct 2 ms 376 KB correct
60 Correct 386 ms 3572 KB correct
61 Correct 736 ms 4840 KB correct
62 Correct 728 ms 4900 KB correct
63 Correct 676 ms 4800 KB correct
64 Correct 674 ms 4716 KB correct
65 Correct 671 ms 4688 KB correct
66 Correct 721 ms 4732 KB correct
67 Correct 720 ms 4844 KB correct
68 Correct 719 ms 4836 KB correct
69 Correct 732 ms 4856 KB correct
70 Correct 2 ms 376 KB correct
71 Correct 732 ms 4688 KB correct
72 Correct 714 ms 4844 KB correct
73 Correct 2 ms 376 KB correct
74 Correct 740 ms 4980 KB correct
75 Correct 701 ms 4704 KB correct
76 Correct 240 ms 2036 KB correct
77 Correct 720 ms 4856 KB correct
78 Correct 714 ms 4716 KB correct
79 Correct 723 ms 4716 KB correct
80 Correct 687 ms 4808 KB correct
81 Correct 573 ms 4220 KB correct
82 Correct 693 ms 4540 KB correct
83 Correct 404 ms 2904 KB correct
84 Correct 216 ms 3440 KB correct
85 Correct 195 ms 3028 KB correct
86 Correct 128 ms 2160 KB correct
87 Correct 98 ms 1652 KB correct
88 Correct 83 ms 1344 KB correct
89 Correct 85 ms 1244 KB correct
90 Correct 73 ms 1268 KB correct
91 Correct 36 ms 504 KB correct
92 Correct 16 ms 376 KB correct
93 Correct 191 ms 3028 KB correct
94 Correct 129 ms 2036 KB correct
95 Correct 124 ms 2040 KB correct
96 Correct 81 ms 1360 KB correct
97 Correct 86 ms 1396 KB correct
98 Correct 96 ms 1752 KB correct
99 Correct 84 ms 1272 KB correct
100 Correct 50 ms 632 KB correct
101 Correct 24 ms 376 KB correct
102 Correct 202 ms 2672 KB correct
103 Correct 207 ms 2676 KB correct
104 Correct 198 ms 2636 KB correct
105 Correct 196 ms 2544 KB correct