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Submission #1104785

# Submission time Handle Problem Language Result Execution time Memory
1104785 2024-10-24T12:11:28 Z alexander707070 Simurgh (IOI17_simurgh) C++14
51 / 100
 3000 ms 6020 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];

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};

		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<v[x].size();i++){
		if(vis[v[x][i].first] or !intree[v[x][i].second]){
			continue;
		}

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

		dfs2(v[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);
	}

	total+=count_common_roads(toask);

	return total;
}

void solve(int root,int l,int r,int s){
	if(l==r){
		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;
			}
		}
	}
	
	for(int i=1;i<=m;i++){
		if(intree[i] and value[i]==0)value[i]=2;
	}

	double fin=clock();
	if((fin-start)/CLOCKS_PER_SEC>0.3)cout<<1/0;

	for(int i=1;i<=n;i++){
		solve(i,0,v[i].size()-1,howmany(i,0,v[i].size()-1));
	}

	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:65:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:206:43: warning: division by zero [-Wdiv-by-zero]
  206 |  if((fin-start)/CLOCKS_PER_SEC>0.3)cout<<1/0;
      |                                          ~^~

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 2 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 2404 KB correct
8 Correct 1 ms 2384 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 2 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 2404 KB correct
8 Correct 1 ms 2384 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 6 ms 2384 KB correct
15 Correct 5 ms 2400 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2556 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 7 ms 2384 KB correct
20 Correct 5 ms 2384 KB correct
21 Correct 4 ms 2384 KB correct
22 Correct 3 ms 2384 KB correct
23 Correct 2 ms 2384 KB correct
24 Correct 2 ms 2384 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2556 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 2 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 3 ms 2384 KB correct
31 Correct 3 ms 2384 KB correct
32 Correct 3 ms 2384 KB correct
33 Correct 3 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 2 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 2404 KB correct
8 Correct 1 ms 2384 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 6 ms 2384 KB correct
15 Correct 5 ms 2400 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2556 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 7 ms 2384 KB correct
20 Correct 5 ms 2384 KB correct
21 Correct 4 ms 2384 KB correct
22 Correct 3 ms 2384 KB correct
23 Correct 2 ms 2384 KB correct
24 Correct 2 ms 2384 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2556 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 2 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 3 ms 2384 KB correct
31 Correct 3 ms 2384 KB correct
32 Correct 3 ms 2384 KB correct
33 Correct 3 ms 2384 KB correct
34 Correct 735 ms 3716 KB correct
35 Correct 681 ms 3700 KB correct
36 Correct 452 ms 3408 KB correct
37 Correct 19 ms 2604 KB correct
38 Correct 719 ms 3704 KB correct
39 Correct 541 ms 3408 KB correct
40 Correct 403 ms 3524 KB correct
41 Correct 461 ms 3704 KB correct
42 Correct 475 ms 3656 KB correct
43 Correct 184 ms 3152 KB correct
44 Correct 124 ms 3068 KB correct
45 Correct 150 ms 3108 KB correct
46 Correct 98 ms 2896 KB correct
47 Correct 33 ms 2640 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 12 ms 2612 KB correct
50 Correct 33 ms 2652 KB correct
51 Correct 146 ms 2896 KB correct
52 Correct 118 ms 2896 KB correct
53 Correct 94 ms 2896 KB correct
54 Correct 171 ms 3152 KB correct
55 Correct 195 ms 3072 KB correct
56 Correct 198 ms 2896 KB correct
57 Correct 202 ms 3096 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2384 KB correct
3 Execution timed out 3057 ms 6020 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
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 2 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 2404 KB correct
8 Correct 1 ms 2384 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 6 ms 2384 KB correct
15 Correct 5 ms 2400 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2556 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 7 ms 2384 KB correct
20 Correct 5 ms 2384 KB correct
21 Correct 4 ms 2384 KB correct
22 Correct 3 ms 2384 KB correct
23 Correct 2 ms 2384 KB correct
24 Correct 2 ms 2384 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2556 KB correct
27 Correct 2 ms 2384 KB correct
28 Correct 2 ms 2384 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 3 ms 2384 KB correct
31 Correct 3 ms 2384 KB correct
32 Correct 3 ms 2384 KB correct
33 Correct 3 ms 2384 KB correct
34 Correct 735 ms 3716 KB correct
35 Correct 681 ms 3700 KB correct
36 Correct 452 ms 3408 KB correct
37 Correct 19 ms 2604 KB correct
38 Correct 719 ms 3704 KB correct
39 Correct 541 ms 3408 KB correct
40 Correct 403 ms 3524 KB correct
41 Correct 461 ms 3704 KB correct
42 Correct 475 ms 3656 KB correct
43 Correct 184 ms 3152 KB correct
44 Correct 124 ms 3068 KB correct
45 Correct 150 ms 3108 KB correct
46 Correct 98 ms 2896 KB correct
47 Correct 33 ms 2640 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 12 ms 2612 KB correct
50 Correct 33 ms 2652 KB correct
51 Correct 146 ms 2896 KB correct
52 Correct 118 ms 2896 KB correct
53 Correct 94 ms 2896 KB correct
54 Correct 171 ms 3152 KB correct
55 Correct 195 ms 3072 KB correct
56 Correct 198 ms 2896 KB correct
57 Correct 202 ms 3096 KB correct
58 Correct 1 ms 2384 KB correct
59 Correct 1 ms 2384 KB correct
60 Execution timed out 3057 ms 6020 KB Time limit exceeded
61 Halted 0 ms 0 KB -