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Submission #1104786

# Submission time Handle Problem Language Result Execution time Memory
1104786 2024-10-24T12:12:13 Z alexander707070 Simurgh (IOI17_simurgh) C++14
51 / 100
 2523 ms 11624 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));

		double fn=clock();
		if((fn-start)/CLOCKS_PER_SEC>2.5)cout<<1/0;
	}

	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;
      |                                          ~^~
simurgh.cpp:212:43: warning: division by zero [-Wdiv-by-zero]
  212 |   if((fn-start)/CLOCKS_PER_SEC>2.5)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 1 ms 2384 KB correct
4 Correct 2 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 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 2640 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 2 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 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 2640 KB correct
14 Correct 6 ms 2384 KB correct
15 Correct 6 ms 2384 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 5 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 3 ms 2384 KB correct
24 Correct 2 ms 2556 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 3 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 2556 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 1 ms 2384 KB correct
4 Correct 2 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 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 2640 KB correct
14 Correct 6 ms 2384 KB correct
15 Correct 6 ms 2384 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 5 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 3 ms 2384 KB correct
24 Correct 2 ms 2556 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 3 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 2556 KB correct
32 Correct 3 ms 2384 KB correct
33 Correct 3 ms 2384 KB correct
34 Correct 704 ms 3936 KB correct
35 Correct 679 ms 3684 KB correct
36 Correct 478 ms 3408 KB correct
37 Correct 20 ms 2384 KB correct
38 Correct 714 ms 3656 KB correct
39 Correct 519 ms 3632 KB correct
40 Correct 380 ms 3408 KB correct
41 Correct 455 ms 3664 KB correct
42 Correct 453 ms 3688 KB correct
43 Correct 177 ms 3192 KB correct
44 Correct 127 ms 2896 KB correct
45 Correct 160 ms 3068 KB correct
46 Correct 114 ms 2896 KB correct
47 Correct 34 ms 2640 KB correct
48 Correct 6 ms 2384 KB correct
49 Correct 12 ms 2612 KB correct
50 Correct 35 ms 2640 KB correct
51 Correct 150 ms 2896 KB correct
52 Correct 122 ms 2896 KB correct
53 Correct 102 ms 2896 KB correct
54 Correct 172 ms 3192 KB correct
55 Correct 200 ms 2896 KB correct
56 Correct 199 ms 3092 KB correct
57 Correct 219 ms 3100 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB correct
2 Correct 1 ms 2640 KB correct
3 Runtime error 2523 ms 11624 KB Execution killed with signal 4
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 1 ms 2384 KB correct
4 Correct 2 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 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 2640 KB correct
14 Correct 6 ms 2384 KB correct
15 Correct 6 ms 2384 KB correct
16 Correct 5 ms 2384 KB correct
17 Correct 5 ms 2384 KB correct
18 Correct 2 ms 2384 KB correct
19 Correct 5 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 3 ms 2384 KB correct
24 Correct 2 ms 2556 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 2 ms 2384 KB correct
27 Correct 3 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 2556 KB correct
32 Correct 3 ms 2384 KB correct
33 Correct 3 ms 2384 KB correct
34 Correct 704 ms 3936 KB correct
35 Correct 679 ms 3684 KB correct
36 Correct 478 ms 3408 KB correct
37 Correct 20 ms 2384 KB correct
38 Correct 714 ms 3656 KB correct
39 Correct 519 ms 3632 KB correct
40 Correct 380 ms 3408 KB correct
41 Correct 455 ms 3664 KB correct
42 Correct 453 ms 3688 KB correct
43 Correct 177 ms 3192 KB correct
44 Correct 127 ms 2896 KB correct
45 Correct 160 ms 3068 KB correct
46 Correct 114 ms 2896 KB correct
47 Correct 34 ms 2640 KB correct
48 Correct 6 ms 2384 KB correct
49 Correct 12 ms 2612 KB correct
50 Correct 35 ms 2640 KB correct
51 Correct 150 ms 2896 KB correct
52 Correct 122 ms 2896 KB correct
53 Correct 102 ms 2896 KB correct
54 Correct 172 ms 3192 KB correct
55 Correct 200 ms 2896 KB correct
56 Correct 199 ms 3092 KB correct
57 Correct 219 ms 3100 KB correct
58 Correct 1 ms 2384 KB correct
59 Correct 1 ms 2640 KB correct
60 Runtime error 2523 ms 11624 KB Execution killed with signal 4
61 Halted 0 ms 0 KB -