oj.uz

Submission #71302

# Submission time Handle Problem Language Result Execution time Memory
71302 2018-08-24T10:17:09 Z Kmcode Simurgh (IOI17_simurgh) C++14
51 / 100
 180 ms 20456 KB 
#include<bits/stdc++.h>
//#include "books.h"
using namespace std;

//#include "simurgh.h"
int count_common_roads(const std::vector<int>& r);

#define MAX 512*512
struct UF{
	int belong[MAX];
	int sz[MAX];
	int col[MAX];
	UF(){
		memset(belong,-1,sizeof(belong));
		for(int i=0;i<MAX;i++)sz[i]=1;
	}
	inline int root(int b){
		if(belong[b]==-1){
			return b;
		}
		return belong[b]=root(belong[b]);
	}
	void merge(int a,int b){
		a=root(a);
		b=root(b);
		if(a==b)return;
		if(a>b)swap(a,b);
		belong[a]=b;
		sz[b]+=sz[a];
	}
};
namespace solver{
	const int white=MAX-3;
	const int black=MAX-2;
	vector<pair<int,int> > v;
	vector<pair<int,int> > g[MAX];
	int id[MAX];
	int pr[MAX];
	int dep[MAX];
	UF uf;
	vector<int> road;
	vector<int> swa;
	
	inline void dfs(int b,int pr2=-1,int d=0){
		dep[b]=d;
			for(auto go:g[b]){
				if(go.first==pr2)continue;
				dfs(go.first,b,d+1);
				pr[go.first]=b;
				id[go.first]=go.second;
			}
	}
	int ini;
	int cn;
	int ask(){
		cn++;
		assert(cn<=30000);
		return count_common_roads(road);
	}
	void make_tree(){
		UF uf2;
		for(int i=0;i<v.size();i++){
			swa.push_back(-1);
			if(uf2.root(v[i].first)!=uf2.root(v[i].second)){
				uf2.merge(v[i].first,v[i].second);
				g[v[i].first].push_back(make_pair(v[i].second,i) );
				g[v[i].second].push_back(make_pair(v[i].first,i) );
				road.push_back(i);
				swa[i]=road.size()-1;
			}
		}
		ini=ask();
	}
	int query(int exp,int add){
		road[swa[exp]]=add;
		int z=ask();
		road[swa[exp]]=exp;
		return z-ini;
	}
	inline void check(int tree1,int tree2){
		int r1=uf.root(tree1);
		int r2=uf.root(tree2);
		if(r1==r2)return;
		if(r1==black||r1==white){
			if(r2==black||r2==white){
				return;
			}
		}
		int ret=query(tree1,tree2);
		if(ret==0){
			uf.merge(tree1,tree2);
			return;
		}
		if(ret>0){
			uf.merge(black,tree2);
			uf.merge(white,tree1);
			return;
		}
		uf.merge(black,tree1);
		uf.merge(white,tree2);
	}
	vector<int> mer[MAX];
	std::vector<int> find_roads(int n, std::vector<int> u1, std::vector<int> v1) {
		for(int i=0;i<u1.size();i++){
			v.push_back(make_pair(u1[i],v1[i]));
		}
		make_tree();
		if(ini==n-1){
			return road;
		}
		if(ini==0){
			for(int i=0;i<road.size();i++){
				uf.merge(road[i],white);
			}
		}
		dfs(0);
		for(int i=0;i<v.size();i++){
			if(dep[v[i].first]>dep[v[i].second])swap(v[i].first,v[i].second);
			if(pr[v[i].second]==v[i].first)continue;
			int a=v[i].first;
			int b=v[i].second;
			while(a!=b){
				if(dep[a]<dep[b]){
					check(id[b],i);
					b=pr[b];
				}
				else{
					check(id[a],i);
					a=pr[a];
				}
			}
		}
		vector<int> ans;
		UF uf2;
		for(int i=0;i<v.size();i++){
			if(uf.root(i)==black){
				ans.push_back(i);
				uf2.merge(v[i].first,v[i].second);
			}
		}
		for(int i=0;i<v.size();i++){
			mer[uf.root(i)].push_back(i);
		}
		for(int i=0;i<v.size();i++){
			if(i==white||i==black)continue;
			//mergeable
			if(mer[i].size()==0)continue;
			UF uf3;
			bool ok=false;
			for(int el:mer[i]){
				int a=v[el].first;
				int b=v[el].second;
				if(uf3.root(a)==uf3.root(b)){
					ok=true;
					break;
				}
				uf3.merge(a,b);
				if(uf2.root(a)==uf2.root(b)){
					ok=true;
					break;
				}
			}
			if(ok==false){
				for(int el:mer[i]){
					road.push_back(el);
					int a=v[el].first;
					int b=v[el].second;
					//uf2.merge(a,b);
				}
			}
		}
		assert(ans.size()>=n-1);
		return ans;
	}
	
}


std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	return solver::find_roads(n,u,v);
}

Compilation message

simurgh.cpp: In function 'void solver::make_tree()':
simurgh.cpp:62:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp: In function 'std::vector<int> solver::find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:104:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<u1.size();i++){
               ~^~~~~~~~~~
simurgh.cpp:112:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<road.size();i++){
                ~^~~~~~~~~~~~
simurgh.cpp:117:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp:135:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp:141:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp:144:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
simurgh.cpp:166:10: warning: unused variable 'a' [-Wunused-variable]
      int a=v[el].first;
          ^
simurgh.cpp:167:10: warning: unused variable 'b' [-Wunused-variable]
      int b=v[el].second;
          ^
In file included from /usr/include/c++/7/cassert:44:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:33,
                 from simurgh.cpp:1:
simurgh.cpp:172:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   assert(ans.size()>=n-1);
          ~~~~~~~~~~^~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 18808 KB correct
2 Correct 23 ms 18916 KB correct
3 Correct 19 ms 18916 KB correct
4 Correct 18 ms 18916 KB correct
5 Correct 17 ms 18916 KB correct
6 Correct 20 ms 18916 KB correct
7 Correct 16 ms 18916 KB correct
8 Correct 16 ms 19080 KB correct
9 Correct 17 ms 19080 KB correct
10 Correct 19 ms 19080 KB correct
11 Correct 19 ms 19080 KB correct
12 Correct 20 ms 19080 KB correct
13 Correct 23 ms 19080 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 18808 KB correct
2 Correct 23 ms 18916 KB correct
3 Correct 19 ms 18916 KB correct
4 Correct 18 ms 18916 KB correct
5 Correct 17 ms 18916 KB correct
6 Correct 20 ms 18916 KB correct
7 Correct 16 ms 18916 KB correct
8 Correct 16 ms 19080 KB correct
9 Correct 17 ms 19080 KB correct
10 Correct 19 ms 19080 KB correct
11 Correct 19 ms 19080 KB correct
12 Correct 20 ms 19080 KB correct
13 Correct 23 ms 19080 KB correct
14 Correct 19 ms 19156 KB correct
15 Correct 20 ms 19156 KB correct
16 Correct 20 ms 19156 KB correct
17 Correct 20 ms 19156 KB correct
18 Correct 18 ms 19156 KB correct
19 Correct 20 ms 19156 KB correct
20 Correct 21 ms 19156 KB correct
21 Correct 21 ms 19156 KB correct
22 Correct 17 ms 19156 KB correct
23 Correct 20 ms 19156 KB correct
24 Correct 20 ms 19156 KB correct
25 Correct 18 ms 19156 KB correct
26 Correct 19 ms 19156 KB correct
27 Correct 18 ms 19156 KB correct
28 Correct 15 ms 19156 KB correct
29 Correct 20 ms 19156 KB correct
30 Correct 18 ms 19156 KB correct
31 Correct 19 ms 19156 KB correct
32 Correct 20 ms 19156 KB correct
33 Correct 17 ms 19156 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 18808 KB correct
2 Correct 23 ms 18916 KB correct
3 Correct 19 ms 18916 KB correct
4 Correct 18 ms 18916 KB correct
5 Correct 17 ms 18916 KB correct
6 Correct 20 ms 18916 KB correct
7 Correct 16 ms 18916 KB correct
8 Correct 16 ms 19080 KB correct
9 Correct 17 ms 19080 KB correct
10 Correct 19 ms 19080 KB correct
11 Correct 19 ms 19080 KB correct
12 Correct 20 ms 19080 KB correct
13 Correct 23 ms 19080 KB correct
14 Correct 19 ms 19156 KB correct
15 Correct 20 ms 19156 KB correct
16 Correct 20 ms 19156 KB correct
17 Correct 20 ms 19156 KB correct
18 Correct 18 ms 19156 KB correct
19 Correct 20 ms 19156 KB correct
20 Correct 21 ms 19156 KB correct
21 Correct 21 ms 19156 KB correct
22 Correct 17 ms 19156 KB correct
23 Correct 20 ms 19156 KB correct
24 Correct 20 ms 19156 KB correct
25 Correct 18 ms 19156 KB correct
26 Correct 19 ms 19156 KB correct
27 Correct 18 ms 19156 KB correct
28 Correct 15 ms 19156 KB correct
29 Correct 20 ms 19156 KB correct
30 Correct 18 ms 19156 KB correct
31 Correct 19 ms 19156 KB correct
32 Correct 20 ms 19156 KB correct
33 Correct 17 ms 19156 KB correct
34 Correct 145 ms 20448 KB correct
35 Correct 139 ms 20448 KB correct
36 Correct 152 ms 20448 KB correct
37 Correct 25 ms 20448 KB correct
38 Correct 163 ms 20448 KB correct
39 Correct 150 ms 20448 KB correct
40 Correct 116 ms 20448 KB correct
41 Correct 145 ms 20456 KB correct
42 Correct 180 ms 20456 KB correct
43 Correct 21 ms 20456 KB correct
44 Correct 28 ms 20456 KB correct
45 Correct 23 ms 20456 KB correct
46 Correct 22 ms 20456 KB correct
47 Correct 20 ms 20456 KB correct
48 Correct 18 ms 20456 KB correct
49 Correct 22 ms 20456 KB correct
50 Correct 24 ms 20456 KB correct
51 Correct 22 ms 20456 KB correct
52 Correct 26 ms 20456 KB correct
53 Correct 24 ms 20456 KB correct
54 Correct 26 ms 20456 KB correct
55 Correct 20 ms 20456 KB correct
56 Correct 20 ms 20456 KB correct
57 Correct 21 ms 20456 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 20456 KB correct
2 Correct 17 ms 20456 KB correct
3 Incorrect 139 ms 20456 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 18808 KB correct
2 Correct 23 ms 18916 KB correct
3 Correct 19 ms 18916 KB correct
4 Correct 18 ms 18916 KB correct
5 Correct 17 ms 18916 KB correct
6 Correct 20 ms 18916 KB correct
7 Correct 16 ms 18916 KB correct
8 Correct 16 ms 19080 KB correct
9 Correct 17 ms 19080 KB correct
10 Correct 19 ms 19080 KB correct
11 Correct 19 ms 19080 KB correct
12 Correct 20 ms 19080 KB correct
13 Correct 23 ms 19080 KB correct
14 Correct 19 ms 19156 KB correct
15 Correct 20 ms 19156 KB correct
16 Correct 20 ms 19156 KB correct
17 Correct 20 ms 19156 KB correct
18 Correct 18 ms 19156 KB correct
19 Correct 20 ms 19156 KB correct
20 Correct 21 ms 19156 KB correct
21 Correct 21 ms 19156 KB correct
22 Correct 17 ms 19156 KB correct
23 Correct 20 ms 19156 KB correct
24 Correct 20 ms 19156 KB correct
25 Correct 18 ms 19156 KB correct
26 Correct 19 ms 19156 KB correct
27 Correct 18 ms 19156 KB correct
28 Correct 15 ms 19156 KB correct
29 Correct 20 ms 19156 KB correct
30 Correct 18 ms 19156 KB correct
31 Correct 19 ms 19156 KB correct
32 Correct 20 ms 19156 KB correct
33 Correct 17 ms 19156 KB correct
34 Correct 145 ms 20448 KB correct
35 Correct 139 ms 20448 KB correct
36 Correct 152 ms 20448 KB correct
37 Correct 25 ms 20448 KB correct
38 Correct 163 ms 20448 KB correct
39 Correct 150 ms 20448 KB correct
40 Correct 116 ms 20448 KB correct
41 Correct 145 ms 20456 KB correct
42 Correct 180 ms 20456 KB correct
43 Correct 21 ms 20456 KB correct
44 Correct 28 ms 20456 KB correct
45 Correct 23 ms 20456 KB correct
46 Correct 22 ms 20456 KB correct
47 Correct 20 ms 20456 KB correct
48 Correct 18 ms 20456 KB correct
49 Correct 22 ms 20456 KB correct
50 Correct 24 ms 20456 KB correct
51 Correct 22 ms 20456 KB correct
52 Correct 26 ms 20456 KB correct
53 Correct 24 ms 20456 KB correct
54 Correct 26 ms 20456 KB correct
55 Correct 20 ms 20456 KB correct
56 Correct 20 ms 20456 KB correct
57 Correct 21 ms 20456 KB correct
58 Correct 16 ms 20456 KB correct
59 Correct 17 ms 20456 KB correct
60 Incorrect 139 ms 20456 KB WA in grader: NO
61 Halted 0 ms 0 KB -