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Submission #1104791

# Submission time Handle Problem Language Result Execution time Memory
1104791 2024-10-24T12:21:27 Z alexander707070 Simurgh (IOI17_simurgh) C++14
100 / 100
 144 ms 8280 KB 
#include<bits/stdc++.h>

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#include "simurgh.h"

#define MAXN 507
#define MAXM 300007
using namespace std;
 
int n,m,dep[MAXN],edges;
vector< pair<int,int> > v[MAXN],tree[MAXN];

bool intree[MAXM],vis[MAXN];

pair<int,int> edge[MAXM],parent[MAXN];

int value[MAXM],st[MAXM],sumtree;
vector<int> ans;

unordered_set<int> s;

int questions;

int calc(vector<int> rem,vector<int> add){
	questions++;

	for(int i:rem)s.erase(i);
	for(int i:add)s.insert(i);

	vector<int> w;
	for(int i:s){
		w.push_back(i-1);
	}

	for(int i:rem)s.insert(i);
	for(int i:add)s.erase(i);

	return count_common_roads(w);
}

void dfs(int x){
	vis[x]=true;

	for(int i=0;i<v[x].size();i++){
		if(vis[v[x][i].first])continue;

		dep[v[x][i].first]=dep[x]+1;
		parent[v[x][i].first]={x,v[x][i].second};

		tree[x].push_back({v[x][i].first,v[x][i].second});
		tree[v[x][i].first].push_back({x,v[x][i].second});

		dfs(v[x][i].first);

		intree[v[x][i].second]=true;
		s.insert(v[x][i].second);
	}
}

vector<int> path,toask;
int total;

void dfs2(int x){
	vis[x]=true;

	for(int i=0;i<tree[x].size();i++){
		if(vis[tree[x][i].first])continue;

		toask.push_back(tree[x][i].second-1);
		total-=(value[tree[x][i].second]-1);

		dfs2(tree[x][i].first);
	}
}

bool ok;

void up(int x,int y){
	if(x==y)return;

	if(value[parent[x].second]==0 or ok){
		if(value[parent[x].second])ok=false;

		path.push_back(parent[x].second);
	}

	up(parent[x].first,y);
}

int howmany(int root,int l,int r){
	toask.clear();

	for(int i=1;i<=n;i++)vis[i]=false;

	vis[root]=true;
	for(int i=l;i<=r;i++)vis[v[root][i].first]=true;

	for(int i=l;i<=r;i++){
		toask.push_back(v[root][i].second-1);
	}

	total=0;

	dfs2(root);
	for(int i=l;i<=r;i++){
		dfs2(v[root][i].first);
	}

	questions++;
	total+=count_common_roads(toask);

	return total;
}

void solve(int root,int l,int r,int s){
	if(l==r and s>0){
		value[v[root][l].second]=2;
		return;
	}

	int mid=(l+r)/2;
	int lt=howmany(root,l,mid);

	if(lt>0){
		solve(root,l,mid,lt);
	}

	if(s-lt){
		solve(root,mid+1,r,s-lt);
	}
}
 
vector<int> find_roads(int N,vector<int> from,vector<int> to){

	n=N; m=int(from.size());

	double start=clock();

	for(int i=1;i<=m;i++){
		from[i-1]++; to[i-1]++;

		edge[i]={from[i-1],to[i-1]};

		v[from[i-1]].push_back({to[i-1],i});
		v[to[i-1]].push_back({from[i-1],i});
	}

	dfs(1);
	sumtree=calc({},{});

	for(int i=1;i<=m;i++){
		if(intree[i])continue;

		int u=from[i-1],w=to[i-1];
		if(dep[u]>dep[w])swap(u,w);

		path.clear(); ok=true;
		up(w,u);

		int mins=sumtree,maxs=sumtree,br=0,ask=0;

		for(int f:path){
			if(value[f]==0){
				st[f]=calc({f},{i});
				br++;

				mins=min(mins,st[f]);
				maxs=max(maxs,st[f]);
			}
		}

		if(br==0)continue;

		if(mins==maxs){
			for(int f:path){
				if(value[f]==0)continue;

				st[f]=calc({f},{i});
				ask=value[f];
				
				mins=min(mins,st[f]);
				maxs=max(maxs,st[f]);

				break;
			}
		}

		if(ask==0)ask=1;

		for(int f:path){
			if(value[f]!=0)continue;

			if(mins==maxs)value[f]=ask;
			else{
				if(st[f]==mins)value[f]=2;
				else value[f]=1;
			}
		}
	}

	if(questions>2*n)cout<<1/0;
	
	for(int i=1;i<=m;i++){
		if(intree[i] and value[i]==0)value[i]=2;
	}

	for(int i=1;i<=n;i++){
		sort(v[i].begin(),v[i].end());

		for(int f=0;f<v[i].size();f++){
			if(v[i][f].first>i){

				solve(i,f,v[i].size()-1,howmany(i,f,v[i].size()-1));
				break;
			}
		}
	}

	for(int i=1;i<=m;i++){
		if(value[i]==2){
			ans.push_back(i-1);
		}
	}

	return ans;
}

Compilation message

simurgh.cpp: In function 'void dfs(int)':
simurgh.cpp:46:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~
simurgh.cpp: In function 'void dfs2(int)':
simurgh.cpp:68:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |  for(int i=0;i<tree[x].size();i++){
      |              ~^~~~~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:203:26: warning: division by zero [-Wdiv-by-zero]
  203 |  if(questions>2*n)cout<<1/0;
      |                         ~^~
simurgh.cpp:212:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  212 |   for(int f=0;f<v[i].size();f++){
      |               ~^~~~~~~~~~~~
simurgh.cpp:139:9: warning: unused variable 'start' [-Wunused-variable]
  139 |  double start=clock();
      |         ^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Correct 1 ms 2384 KB correct
4 Correct 1 ms 2384 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2384 KB correct
8 Correct 1 ms 2552 KB correct
9 Correct 1 ms 2384 KB correct
10 Correct 1 ms 2384 KB correct
11 Correct 1 ms 2384 KB correct
12 Correct 1 ms 2384 KB correct
13 Correct 1 ms 2384 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Correct 1 ms 2384 KB correct
4 Correct 1 ms 2384 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2384 KB correct
8 Correct 1 ms 2552 KB correct
9 Correct 1 ms 2384 KB correct
10 Correct 1 ms 2384 KB correct
11 Correct 1 ms 2384 KB correct
12 Correct 1 ms 2384 KB correct
13 Correct 1 ms 2384 KB correct
14 Correct 2 ms 2384 KB correct
15 Correct 2 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 2 ms 2384 KB correct
20 Correct 2 ms 2384 KB correct
21 Correct 2 ms 2384 KB correct
22 Correct 2 ms 2556 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 2 ms 2552 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 1 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 2 ms 2384 KB correct
31 Correct 2 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 1 ms 2384 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Correct 1 ms 2384 KB correct
4 Correct 1 ms 2384 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2384 KB correct
8 Correct 1 ms 2552 KB correct
9 Correct 1 ms 2384 KB correct
10 Correct 1 ms 2384 KB correct
11 Correct 1 ms 2384 KB correct
12 Correct 1 ms 2384 KB correct
13 Correct 1 ms 2384 KB correct
14 Correct 2 ms 2384 KB correct
15 Correct 2 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 2 ms 2384 KB correct
20 Correct 2 ms 2384 KB correct
21 Correct 2 ms 2384 KB correct
22 Correct 2 ms 2556 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 2 ms 2552 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 1 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 2 ms 2384 KB correct
31 Correct 2 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 1 ms 2384 KB correct
34 Correct 23 ms 3664 KB correct
35 Correct 24 ms 3664 KB correct
36 Correct 20 ms 3420 KB correct
37 Correct 7 ms 2384 KB correct
38 Correct 29 ms 3744 KB correct
39 Correct 20 ms 3664 KB correct
40 Correct 18 ms 3408 KB correct
41 Correct 23 ms 3508 KB correct
42 Correct 23 ms 3608 KB correct
43 Correct 15 ms 3152 KB correct
44 Correct 14 ms 3064 KB correct
45 Correct 18 ms 2896 KB correct
46 Correct 16 ms 3052 KB correct
47 Correct 11 ms 2640 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 7 ms 2384 KB correct
50 Correct 10 ms 2676 KB correct
51 Correct 15 ms 2896 KB correct
52 Correct 14 ms 2896 KB correct
53 Correct 13 ms 2896 KB correct
54 Correct 16 ms 3332 KB correct
55 Correct 17 ms 2896 KB correct
56 Correct 17 ms 2896 KB correct
57 Correct 16 ms 3064 KB correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Correct 79 ms 5788 KB correct
4 Correct 132 ms 7240 KB correct
5 Correct 132 ms 7244 KB correct
6 Correct 127 ms 7240 KB correct
7 Correct 115 ms 7240 KB correct
8 Correct 113 ms 7240 KB correct
9 Correct 130 ms 7376 KB correct
10 Correct 134 ms 7364 KB correct
11 Correct 142 ms 7260 KB correct
12 Correct 131 ms 7240 KB correct
13 Correct 1 ms 2384 KB correct
14 Correct 129 ms 7252 KB correct
15 Correct 132 ms 7240 KB correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Correct 1 ms 2384 KB correct
4 Correct 1 ms 2384 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2384 KB correct
8 Correct 1 ms 2552 KB correct
9 Correct 1 ms 2384 KB correct
10 Correct 1 ms 2384 KB correct
11 Correct 1 ms 2384 KB correct
12 Correct 1 ms 2384 KB correct
13 Correct 1 ms 2384 KB correct
14 Correct 2 ms 2384 KB correct
15 Correct 2 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 2 ms 2384 KB correct
20 Correct 2 ms 2384 KB correct
21 Correct 2 ms 2384 KB correct
22 Correct 2 ms 2556 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 2 ms 2552 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 1 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 2 ms 2384 KB correct
31 Correct 2 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 1 ms 2384 KB correct
34 Correct 23 ms 3664 KB correct
35 Correct 24 ms 3664 KB correct
36 Correct 20 ms 3420 KB correct
37 Correct 7 ms 2384 KB correct
38 Correct 29 ms 3744 KB correct
39 Correct 20 ms 3664 KB correct
40 Correct 18 ms 3408 KB correct
41 Correct 23 ms 3508 KB correct
42 Correct 23 ms 3608 KB correct
43 Correct 15 ms 3152 KB correct
44 Correct 14 ms 3064 KB correct
45 Correct 18 ms 2896 KB correct
46 Correct 16 ms 3052 KB correct
47 Correct 11 ms 2640 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 7 ms 2384 KB correct
50 Correct 10 ms 2676 KB correct
51 Correct 15 ms 2896 KB correct
52 Correct 14 ms 2896 KB correct
53 Correct 13 ms 2896 KB correct
54 Correct 16 ms 3332 KB correct
55 Correct 17 ms 2896 KB correct
56 Correct 17 ms 2896 KB correct
57 Correct 16 ms 3064 KB correct
58 Correct 1 ms 2384 KB correct
59 Correct 1 ms 2384 KB correct
60 Correct 79 ms 5788 KB correct
61 Correct 132 ms 7240 KB correct
62 Correct 132 ms 7244 KB correct
63 Correct 127 ms 7240 KB correct
64 Correct 115 ms 7240 KB correct
65 Correct 113 ms 7240 KB correct
66 Correct 130 ms 7376 KB correct
67 Correct 134 ms 7364 KB correct
68 Correct 142 ms 7260 KB correct
69 Correct 131 ms 7240 KB correct
70 Correct 1 ms 2384 KB correct
71 Correct 129 ms 7252 KB correct
72 Correct 132 ms 7240 KB correct
73 Correct 1 ms 2384 KB correct
74 Correct 134 ms 7240 KB correct
75 Correct 136 ms 8008 KB correct
76 Correct 57 ms 4688 KB correct
77 Correct 139 ms 8184 KB correct
78 Correct 131 ms 8280 KB correct
79 Correct 131 ms 8152 KB correct
80 Correct 128 ms 8236 KB correct
81 Correct 102 ms 7496 KB correct
82 Correct 144 ms 8176 KB correct
83 Correct 90 ms 5616 KB correct
84 Correct 86 ms 6276 KB correct
85 Correct 79 ms 5968 KB correct
86 Correct 60 ms 4700 KB correct
87 Correct 52 ms 4432 KB correct
88 Correct 45 ms 3852 KB correct
89 Correct 49 ms 3820 KB correct
90 Correct 45 ms 3560 KB correct
91 Correct 20 ms 2640 KB correct
92 Correct 12 ms 2808 KB correct
93 Correct 73 ms 6136 KB correct
94 Correct 59 ms 4928 KB correct
95 Correct 59 ms 4688 KB correct
96 Correct 45 ms 3776 KB correct
97 Correct 48 ms 3892 KB correct
98 Correct 50 ms 4600 KB correct
99 Correct 47 ms 3664 KB correct
100 Correct 29 ms 2928 KB correct
101 Correct 13 ms 2640 KB correct
102 Correct 87 ms 5176 KB correct
103 Correct 85 ms 5200 KB correct
104 Correct 84 ms 5200 KB correct
105 Correct 82 ms 5200 KB correct