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Submission #413674

# Submission time Handle Problem Language Result Execution time Memory
413674 2021-05-29T08:45:48 Z Jasiekstrz Simurgh (IOI17_simurgh) C++17
100 / 100
 736 ms 6980 KB 
#include<bits/stdc++.h>
#include "simurgh.h"
#define fi first
#define se second
using namespace std;
const int N=500;
const int M=N*N;
vector<pair<int,int>> e[N+10];
vector<int> ans;
bool wyn[M+10];
bool vis[N+10];
vector<int> alw;
vector<pair<int,int>> edg;
vector<int> base_tree_edg;
bool vis_curr[N+10];
bool vis_curr_e[M+10];
bool vis_e[M+10];
bool vis_solve[N+10];
int fau[N+10];
set<int> st_fau;
int fnd(int x)
{
	if(fau[x]!=x)
		fau[x]=fnd(fau[x]);
	return fau[x];
}
void un(int x,int y)
{
	fau[fnd(x)]=fnd(y);
	return;
}
bool dfs_cycle(int x,int bg,vector<int> &cycle,vector<int> &cycle_e)
{
	vis[x]=true;
	st_fau.insert(fnd(x));
	cycle.push_back(x);
	for(auto v:e[x])
	{
		if(v.fi==bg && cycle.size()>2)
		{
			cycle_e.push_back(v.se);
			return true;
		}
		if(vis[v.fi] || st_fau.find(fnd(v.fi))!=st_fau.end())
			continue;
		cycle_e.push_back(v.se);
		if(dfs_cycle(v.fi,bg,cycle,cycle_e))
			return true;
		cycle_e.pop_back();
	}
	cycle.pop_back();
	st_fau.erase(fnd(x));
	return false;
}
int dfs_path(int x,vector<int> &path,vector<int> &path_e)
{
	//cerr<<x<<"\n";
	vis[x]=true;
	path.push_back(x);
	for(auto v:e[x])
	{
		if(vis[v.fi] || (vis_solve[v.fi] && !vis_curr[v.fi]))
			continue;
		if(vis_curr[v.fi] && path.size()>1)
		{
			path_e.push_back(v.se);
			return v.fi;
		}
		else if(vis_curr[v.fi])
			continue;
		path_e.push_back(v.se);
		int en=dfs_path(v.fi,path,path_e);
		//cerr<<x<<" "<<v.fi<<" "<<en<<"\n";
		if(en!=-1)
			return en;
		path_e.pop_back();
	}
	path.pop_back();
	return -1;
}
void dfs_rest(int x,vector<int> &que)
{
	vis[x]=true;
	for(auto v:e[x])
	{
		if(!vis[v.fi])
		{
			que.push_back(v.se);
			dfs_rest(v.fi,que);
		}
	}
	return;
}
bool dfs_curr_rest(int x,int en,vector<int> &que)
{
	if(x==en)
		return true;
	vis[x]=true;
	for(auto v:e[x])
	{
		if(!vis[v.fi] && vis_curr_e[v.se])
		{
			que.push_back(v.se);
			if(dfs_curr_rest(v.fi,en,que))
				return true;
			que.pop_back();
		}
	}
	return false;
}
void add_full(vector<int> &cycle,vector<int> &cycle_e,int n)
{
	//for(auto v:cycle)
	//	cerr<<v<<" ";
	//cerr<<"\n";
	//for(auto v:cycle_e)
	//	cerr<<v<<" ";
	//cerr<<"\n\n";
	int mn=n-1;
	vector<int> g;
	vector<int> que;
	que.reserve(n-1);
	for(auto v:cycle_e)
	{
		que.clear();
		for(auto v2:cycle_e)
		{
			if(v2!=v)
				que.push_back(v2);
		}
		for(int i=0;i<n;i++)
			vis[i]=false;
		for(auto v2:cycle)
			vis[v2]=true;
		for(auto v2:cycle)
			dfs_rest(v2,que);
		int tmp=count_common_roads(que);
		//for(auto v:que)
		//	cerr<<v<<" ";
		//cerr<<"\n"<<tmp<<"\n\n";
		if(tmp<mn)
		{
			mn=tmp;
			g.clear();
		}
		if(tmp==mn)
			g.push_back(v);
	}
	if(g.size()==cycle_e.size())
		g.clear();
	for(auto v:g)
	{
		wyn[v]=true;
		//cerr<<v<<"\n";
	}
	for(size_t i=0;i<cycle_e.size()-1;i++)
	{
		//cerr<<cycle_e[i]<<"\n";
		base_tree_edg.push_back(cycle_e[i]);
	}
	return;
}
void add_path(int bg,int en,vector<int> &cycle,vector<int> &cycle_e,
		vector<int> &path,vector<int> &path_e,int n)
{
	int mn=n-1;
	vector<int> g;
	vector<int> que;
	vector<int> rst;
	que.reserve(n-1);
	for(int i=0;i<n;i++)
		vis[i]=false;
	dfs_curr_rest(bg,en,rst);
	//cerr<<bg<<" "<<en<<"\n";
	//for(auto v:path_e)
	//	cerr<<v<<" ";
	//cerr<<"\n";
	//for(auto v:rst)
	//	cerr<<v<<" ";
	//cerr<<"\n\n";
	for(auto v:path_e)
	{
		que.clear();
		for(auto v2:path_e)
		{
			if(v2!=v)
				que.push_back(v2);
		}
		for(auto v2:rst)
			que.push_back(v2);
		for(int i=0;i<n;i++)
			vis[i]=false;
		for(auto v2:que)
			vis[edg[v2].fi]=vis[edg[v2].se]=true;
		for(int i=0;i<n;i++)
		{
			if(vis[i])
				dfs_rest(i,que);
		}
		//for(auto v:que)
		//	cerr<<v<<" ";
		//cerr<<"\n";
		//cerr<<"xd\n";
		int tmp=count_common_roads(que);
		//cerr<<"xd1\n";
		if(tmp<mn)
		{
			mn=tmp;
			g.clear();
		}
		if(tmp==mn)
			g.push_back(v);
	}
	que.clear();
	for(auto v2:path_e)
		que.push_back(v2);
	for(size_t i=0;i<rst.size()-1;i++)
		que.push_back(rst[i]);
	for(int i=0;i<n;i++)
		vis[i]=false;
	for(auto v2:que)
		vis[edg[v2].fi]=vis[edg[v2].se]=true;
	for(int i=0;i<n;i++)
	{
		if(vis[i])
			dfs_rest(i,que);
	}
	int tmp=count_common_roads(que);
	if(tmp<mn || (tmp==mn && !wyn[rst.back()]))
		g.clear();
	for(auto v:g)
		wyn[v]=true;
	for(size_t i=0;i<path_e.size()-1;i++)
		base_tree_edg.push_back(path_e[i]);
	return;
}
void solve(int x,int n)
{
	//cerr<<x<<"\n";
	for(int i=0;i<n;i++)
		vis_curr[i]=false;
	for(size_t i=0;i<edg.size();i++)
		vis_curr_e[i]=false;
	vector<int> cycle,cycle_e;
	for(int i=0;i<n;i++)
		vis[i]=false;
	st_fau.clear();
	if(!dfs_cycle(x,x,cycle,cycle_e))
		return;
	add_full(cycle,cycle_e,n);
	for(auto v:cycle)
		vis_curr[v]=vis_solve[v]=true;
	for(auto v:cycle_e)
	{
		vis_e[v]=vis_curr_e[v]=true;
		un(edg[v].fi,edg[v].se);
	}
	//for(auto v:cycle)
	//	cerr<<v<<" ";
	//cerr<<"\n";
	vector<int> path,path_e;
	while(true)
	{
		path.clear();
		path_e.clear();
		for(int i=0;i<n;i++)
			vis[i]=false;
		int bg,en;
		for(bg=0;bg<n;bg++)
		{
			if(!vis_curr[bg])
				continue;
			en=dfs_path(bg,path,path_e);
			if(en!=-1)
				break;
		}
		if(path.empty())
			break;
		add_path(bg,en,cycle,cycle_e,path,path_e,n);
		for(auto v:path)
			vis_curr[v]=vis_solve[v]=true;
		for(auto v:path_e)
		{
			vis_e[v]=vis_curr_e[v]=true;
			un(edg[v].fi,edg[v].se);
		}
	}
	return;
}
int ask_interval(int x,int l,int r,int n)
{
	int tmp_s=0;
	vector<int> tmp;
	tmp.reserve(n-1);
	for(int i=0;i<n;i++)
		fau[i]=i;
	for(auto v:e[x])
	{
		if(l<=v.fi && v.fi<=r)
		{
			tmp.push_back(v.se);
			un(v.fi,x);
		}
	}
	for(auto v:base_tree_edg)
	{
		if(fnd(edg[v].fi)!=fnd(edg[v].se))
		{
			un(edg[v].fi,edg[v].se);
			tmp.push_back(v);
			tmp_s-=wyn[v];
		}
	}
	return tmp_s+count_common_roads(tmp);
}
void bs(int x,int l,int r,int s,int n)
{
	if(s==0)
		return;
	if(l==r)
	{
		for(auto v:e[x])
		{
			if(v.fi==l)
			{
				wyn[v.se]=true;
				break;
			}
		}
		return;
	}
	int mid=(l+r)/2;
	int tmp_s=ask_interval(x,l,mid,n);
	bs(x,l,mid,tmp_s,n);
	bs(x,mid+1,r,s-tmp_s,n);
	return;
}
vector<int> find_roads(int n,vector<int> u,vector<int> v)
{
	int m=u.size();
	edg.resize(m);
	for(int i=0;i<m;i++)
	{
		e[u[i]].emplace_back(v[i],i);
		e[v[i]].emplace_back(u[i],i);
		edg[i]={u[i],v[i]};
	}
	for(int i=0;i<n;i++)
		fau[i]=i;
	for(int i=0;i<n;i++)
		solve(i,n);
	for(int i=0;i<m;i++)
	{
		auto vv=edg[i];
		if(fnd(vv.fi)!=fnd(vv.se))
		{
			base_tree_edg.push_back(i);
			wyn[i]=true;
			un(vv.fi,vv.se);
		}
	}
	//for(auto v:base_tree_edg)
	//	cerr<<v<<" "<<wyn[v]<<"\n";
	for(int i=0;i<n;i++)
		bs(i,0,i-1,ask_interval(i,0,i-1,n),n);
	for(int i=0;i<m;i++)
	{
		if(wyn[i])
		{
			ans.push_back(i);
			//cerr<<i<<"\n";
		}
	}
	return ans;
}

Compilation message

simurgh.cpp: In function 'void solve(int, int)':
simurgh.cpp:279:11: warning: 'en' may be used uninitialized in this function [-Wmaybe-uninitialized]
  279 |   add_path(bg,en,cycle,cycle_e,path,path_e,n);
      |   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB correct
2 Correct 1 ms 204 KB correct
3 Correct 1 ms 204 KB correct
4 Correct 1 ms 204 KB correct
5 Correct 1 ms 204 KB correct
6 Correct 1 ms 204 KB correct
7 Correct 1 ms 204 KB correct
8 Correct 1 ms 204 KB correct
9 Correct 1 ms 204 KB correct
10 Correct 1 ms 204 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 2 ms 324 KB correct
13 Correct 1 ms 316 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB correct
2 Correct 1 ms 204 KB correct
3 Correct 1 ms 204 KB correct
4 Correct 1 ms 204 KB correct
5 Correct 1 ms 204 KB correct
6 Correct 1 ms 204 KB correct
7 Correct 1 ms 204 KB correct
8 Correct 1 ms 204 KB correct
9 Correct 1 ms 204 KB correct
10 Correct 1 ms 204 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 2 ms 324 KB correct
13 Correct 1 ms 316 KB correct
14 Correct 2 ms 332 KB correct
15 Correct 3 ms 332 KB correct
16 Correct 2 ms 332 KB correct
17 Correct 2 ms 332 KB correct
18 Correct 2 ms 332 KB correct
19 Correct 2 ms 332 KB correct
20 Correct 2 ms 332 KB correct
21 Correct 2 ms 332 KB correct
22 Correct 2 ms 332 KB correct
23 Correct 2 ms 316 KB correct
24 Correct 2 ms 332 KB correct
25 Correct 2 ms 332 KB correct
26 Correct 2 ms 316 KB correct
27 Correct 2 ms 320 KB correct
28 Correct 2 ms 320 KB correct
29 Correct 2 ms 312 KB correct
30 Correct 2 ms 332 KB correct
31 Correct 3 ms 332 KB correct
32 Correct 2 ms 332 KB correct
33 Correct 2 ms 332 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB correct
2 Correct 1 ms 204 KB correct
3 Correct 1 ms 204 KB correct
4 Correct 1 ms 204 KB correct
5 Correct 1 ms 204 KB correct
6 Correct 1 ms 204 KB correct
7 Correct 1 ms 204 KB correct
8 Correct 1 ms 204 KB correct
9 Correct 1 ms 204 KB correct
10 Correct 1 ms 204 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 2 ms 324 KB correct
13 Correct 1 ms 316 KB correct
14 Correct 2 ms 332 KB correct
15 Correct 3 ms 332 KB correct
16 Correct 2 ms 332 KB correct
17 Correct 2 ms 332 KB correct
18 Correct 2 ms 332 KB correct
19 Correct 2 ms 332 KB correct
20 Correct 2 ms 332 KB correct
21 Correct 2 ms 332 KB correct
22 Correct 2 ms 332 KB correct
23 Correct 2 ms 316 KB correct
24 Correct 2 ms 332 KB correct
25 Correct 2 ms 332 KB correct
26 Correct 2 ms 316 KB correct
27 Correct 2 ms 320 KB correct
28 Correct 2 ms 320 KB correct
29 Correct 2 ms 312 KB correct
30 Correct 2 ms 332 KB correct
31 Correct 3 ms 332 KB correct
32 Correct 2 ms 332 KB correct
33 Correct 2 ms 332 KB correct
34 Correct 90 ms 1836 KB correct
35 Correct 54 ms 1792 KB correct
36 Correct 70 ms 1536 KB correct
37 Correct 30 ms 388 KB correct
38 Correct 62 ms 1824 KB correct
39 Correct 78 ms 1680 KB correct
40 Correct 48 ms 1484 KB correct
41 Correct 58 ms 1816 KB correct
42 Correct 58 ms 1816 KB correct
43 Correct 52 ms 1228 KB correct
44 Correct 43 ms 972 KB correct
45 Correct 47 ms 972 KB correct
46 Correct 43 ms 944 KB correct
47 Correct 31 ms 588 KB correct
48 Correct 21 ms 364 KB correct
49 Correct 25 ms 448 KB correct
50 Correct 31 ms 640 KB correct
51 Correct 51 ms 1088 KB correct
52 Correct 41 ms 1008 KB correct
53 Correct 40 ms 948 KB correct
54 Correct 66 ms 1280 KB correct
55 Correct 35 ms 1100 KB correct
56 Correct 36 ms 980 KB correct
57 Correct 38 ms 1104 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB correct
2 Correct 1 ms 332 KB correct
3 Correct 214 ms 4232 KB correct
4 Correct 508 ms 6848 KB correct
5 Correct 470 ms 6860 KB correct
6 Correct 317 ms 6828 KB correct
7 Correct 736 ms 6832 KB correct
8 Correct 418 ms 6852 KB correct
9 Correct 578 ms 6920 KB correct
10 Correct 536 ms 6980 KB correct
11 Correct 463 ms 6852 KB correct
12 Correct 630 ms 6744 KB correct
13 Correct 1 ms 204 KB correct
14 Correct 309 ms 6740 KB correct
15 Correct 329 ms 6788 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB correct
2 Correct 1 ms 204 KB correct
3 Correct 1 ms 204 KB correct
4 Correct 1 ms 204 KB correct
5 Correct 1 ms 204 KB correct
6 Correct 1 ms 204 KB correct
7 Correct 1 ms 204 KB correct
8 Correct 1 ms 204 KB correct
9 Correct 1 ms 204 KB correct
10 Correct 1 ms 204 KB correct
11 Correct 1 ms 332 KB correct
12 Correct 2 ms 324 KB correct
13 Correct 1 ms 316 KB correct
14 Correct 2 ms 332 KB correct
15 Correct 3 ms 332 KB correct
16 Correct 2 ms 332 KB correct
17 Correct 2 ms 332 KB correct
18 Correct 2 ms 332 KB correct
19 Correct 2 ms 332 KB correct
20 Correct 2 ms 332 KB correct
21 Correct 2 ms 332 KB correct
22 Correct 2 ms 332 KB correct
23 Correct 2 ms 316 KB correct
24 Correct 2 ms 332 KB correct
25 Correct 2 ms 332 KB correct
26 Correct 2 ms 316 KB correct
27 Correct 2 ms 320 KB correct
28 Correct 2 ms 320 KB correct
29 Correct 2 ms 312 KB correct
30 Correct 2 ms 332 KB correct
31 Correct 3 ms 332 KB correct
32 Correct 2 ms 332 KB correct
33 Correct 2 ms 332 KB correct
34 Correct 90 ms 1836 KB correct
35 Correct 54 ms 1792 KB correct
36 Correct 70 ms 1536 KB correct
37 Correct 30 ms 388 KB correct
38 Correct 62 ms 1824 KB correct
39 Correct 78 ms 1680 KB correct
40 Correct 48 ms 1484 KB correct
41 Correct 58 ms 1816 KB correct
42 Correct 58 ms 1816 KB correct
43 Correct 52 ms 1228 KB correct
44 Correct 43 ms 972 KB correct
45 Correct 47 ms 972 KB correct
46 Correct 43 ms 944 KB correct
47 Correct 31 ms 588 KB correct
48 Correct 21 ms 364 KB correct
49 Correct 25 ms 448 KB correct
50 Correct 31 ms 640 KB correct
51 Correct 51 ms 1088 KB correct
52 Correct 41 ms 1008 KB correct
53 Correct 40 ms 948 KB correct
54 Correct 66 ms 1280 KB correct
55 Correct 35 ms 1100 KB correct
56 Correct 36 ms 980 KB correct
57 Correct 38 ms 1104 KB correct
58 Correct 1 ms 204 KB correct
59 Correct 1 ms 332 KB correct
60 Correct 214 ms 4232 KB correct
61 Correct 508 ms 6848 KB correct
62 Correct 470 ms 6860 KB correct
63 Correct 317 ms 6828 KB correct
64 Correct 736 ms 6832 KB correct
65 Correct 418 ms 6852 KB correct
66 Correct 578 ms 6920 KB correct
67 Correct 536 ms 6980 KB correct
68 Correct 463 ms 6852 KB correct
69 Correct 630 ms 6744 KB correct
70 Correct 1 ms 204 KB correct
71 Correct 309 ms 6740 KB correct
72 Correct 329 ms 6788 KB correct
73 Correct 1 ms 204 KB correct
74 Correct 479 ms 6896 KB correct
75 Correct 471 ms 6628 KB correct
76 Correct 177 ms 2752 KB correct
77 Correct 336 ms 6784 KB correct
78 Correct 615 ms 6852 KB correct
79 Correct 340 ms 6816 KB correct
80 Correct 505 ms 6724 KB correct
81 Correct 251 ms 5920 KB correct
82 Correct 415 ms 6608 KB correct
83 Correct 287 ms 3896 KB correct
84 Correct 278 ms 4548 KB correct
85 Correct 388 ms 4420 KB correct
86 Correct 307 ms 2888 KB correct
87 Correct 221 ms 2404 KB correct
88 Correct 199 ms 1732 KB correct
89 Correct 193 ms 1668 KB correct
90 Correct 176 ms 1484 KB correct
91 Correct 112 ms 460 KB correct
92 Correct 103 ms 332 KB correct
93 Correct 382 ms 4332 KB correct
94 Correct 269 ms 2804 KB correct
95 Correct 314 ms 2904 KB correct
96 Correct 210 ms 1608 KB correct
97 Correct 206 ms 1740 KB correct
98 Correct 243 ms 2384 KB correct
99 Correct 192 ms 1756 KB correct
100 Correct 137 ms 708 KB correct
101 Correct 108 ms 452 KB correct
102 Correct 251 ms 3576 KB correct
103 Correct 230 ms 3592 KB correct
104 Correct 215 ms 3500 KB correct
105 Correct 212 ms 3512 KB correct