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Submission #1104790

# Submission time Handle Problem Language Result Execution time Memory
1104790 2024-10-24T12:17:37 Z alexander707070 Simurgh (IOI17_simurgh) C++14
70 / 100
 179 ms 7248 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){
		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++){
		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: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: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 2396 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2556 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 1 ms 2384 KB correct
4 Correct 1 ms 2396 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2556 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 3 ms 2384 KB correct
15 Correct 3 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 1 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 2384 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 1 ms 2524 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 1 ms 2384 KB correct
27 Correct 1 ms 2384 KB correct
28 Correct 1 ms 2560 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 1 ms 2384 KB correct
31 Correct 1 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 2 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 2396 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2556 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 3 ms 2384 KB correct
15 Correct 3 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 1 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 2384 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 1 ms 2524 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 1 ms 2384 KB correct
27 Correct 1 ms 2384 KB correct
28 Correct 1 ms 2560 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 1 ms 2384 KB correct
31 Correct 1 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 2 ms 2384 KB correct
34 Correct 30 ms 3664 KB correct
35 Correct 29 ms 3664 KB correct
36 Correct 26 ms 3408 KB correct
37 Correct 9 ms 2384 KB correct
38 Correct 31 ms 3512 KB correct
39 Correct 27 ms 3640 KB correct
40 Correct 23 ms 3408 KB correct
41 Correct 25 ms 3664 KB correct
42 Correct 24 ms 3664 KB correct
43 Correct 17 ms 3320 KB correct
44 Correct 15 ms 3068 KB correct
45 Correct 15 ms 2896 KB correct
46 Correct 14 ms 2896 KB correct
47 Correct 11 ms 2808 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 8 ms 2636 KB correct
50 Correct 11 ms 2816 KB correct
51 Correct 17 ms 2896 KB correct
52 Correct 15 ms 2896 KB correct
53 Correct 14 ms 3068 KB correct
54 Correct 17 ms 3152 KB correct
55 Correct 17 ms 2896 KB correct
56 Correct 18 ms 2896 KB correct
57 Correct 17 ms 2896 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 101 ms 5960 KB correct
4 Correct 162 ms 7240 KB correct
5 Correct 168 ms 7148 KB correct
6 Correct 143 ms 7208 KB correct
7 Correct 137 ms 7240 KB correct
8 Correct 136 ms 7240 KB correct
9 Correct 171 ms 7240 KB correct
10 Correct 179 ms 7224 KB correct
11 Correct 171 ms 7240 KB correct
12 Correct 171 ms 7240 KB correct
13 Correct 1 ms 2384 KB correct
14 Correct 153 ms 7248 KB correct
15 Correct 179 ms 7240 KB correct

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 1 ms 2396 KB correct
5 Correct 1 ms 2384 KB correct
6 Correct 1 ms 2384 KB correct
7 Correct 1 ms 2556 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 3 ms 2384 KB correct
15 Correct 3 ms 2384 KB correct
16 Correct 2 ms 2384 KB correct
17 Correct 2 ms 2384 KB correct
18 Correct 1 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 2384 KB correct
23 Correct 1 ms 2384 KB correct
24 Correct 1 ms 2524 KB correct
25 Correct 1 ms 2384 KB correct
26 Correct 1 ms 2384 KB correct
27 Correct 1 ms 2384 KB correct
28 Correct 1 ms 2560 KB correct
29 Correct 1 ms 2384 KB correct
30 Correct 1 ms 2384 KB correct
31 Correct 1 ms 2384 KB correct
32 Correct 2 ms 2384 KB correct
33 Correct 2 ms 2384 KB correct
34 Correct 30 ms 3664 KB correct
35 Correct 29 ms 3664 KB correct
36 Correct 26 ms 3408 KB correct
37 Correct 9 ms 2384 KB correct
38 Correct 31 ms 3512 KB correct
39 Correct 27 ms 3640 KB correct
40 Correct 23 ms 3408 KB correct
41 Correct 25 ms 3664 KB correct
42 Correct 24 ms 3664 KB correct
43 Correct 17 ms 3320 KB correct
44 Correct 15 ms 3068 KB correct
45 Correct 15 ms 2896 KB correct
46 Correct 14 ms 2896 KB correct
47 Correct 11 ms 2808 KB correct
48 Correct 5 ms 2384 KB correct
49 Correct 8 ms 2636 KB correct
50 Correct 11 ms 2816 KB correct
51 Correct 17 ms 2896 KB correct
52 Correct 15 ms 2896 KB correct
53 Correct 14 ms 3068 KB correct
54 Correct 17 ms 3152 KB correct
55 Correct 17 ms 2896 KB correct
56 Correct 18 ms 2896 KB correct
57 Correct 17 ms 2896 KB correct
58 Correct 1 ms 2384 KB correct
59 Correct 1 ms 2384 KB correct
60 Correct 101 ms 5960 KB correct
61 Correct 162 ms 7240 KB correct
62 Correct 168 ms 7148 KB correct
63 Correct 143 ms 7208 KB correct
64 Correct 137 ms 7240 KB correct
65 Correct 136 ms 7240 KB correct
66 Correct 171 ms 7240 KB correct
67 Correct 179 ms 7224 KB correct
68 Correct 171 ms 7240 KB correct
69 Correct 171 ms 7240 KB correct
70 Correct 1 ms 2384 KB correct
71 Correct 153 ms 7248 KB correct
72 Correct 179 ms 7240 KB correct
73 Correct 1 ms 2384 KB correct
74 Incorrect 165 ms 7172 KB WA in grader: NO
75 Halted 0 ms 0 KB -