oj.uz

Submission #1051382

# Submission time Handle Problem Language Result Execution time Memory
1051382 2024-08-10T05:39:22 Z pcc Connecting Supertrees (IOI20_supertrees) C++17
21 / 100
 103 ms 26196 KB 
#include "supertrees.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;

const int mxn = 1010;

struct DSU{
	int dsu[mxn],sz[mxn];
	DSU(){
		iota(dsu,dsu+mxn,0);
		fill(sz,sz+mxn,1);
	}
	int root(int k){
		return k == dsu[k]?k:dsu[k] = root(dsu[k]);
	}
	void onion(int a,int b){
		a = root(a),b = root(b);
		if(a == b)return;
		if(sz[a]<sz[b])swap(a,b);
		dsu[b] = a;
		sz[a] += sz[b];
	}
};

/*
std::vector<std::vector<int>> answer(n,vector<int>(n,0));
build(answer);
return 1;
*/

DSU chain,cyc;
int N;
vector<vector<int>> ans;
vector<vector<int>> tar;
vector<int> v[mxn];
int head[mxn];

void add_edge(int a,int b){
	assert(a != b);
	ans[a][b] = ans[b][a] = 1;
}

bool check(){
	for(int i = 0;i<N;i++){
		for(int j = 0;j<N;j++){
			if(tar[i][j] == 0){
				if(chain.root(i) == chain.root(j))return false;
			}
			else if(tar[i][j] == 1){
				if(chain.root(i) != chain.root(j))return false;
			}
			else{
				if(chain.root(i) == chain.root(j))return false;
				int a = head[chain.root(i)],b = head[chain.root(j)];
				if(cyc.root(a) != cyc.root(b))return false;
			}
		}
	}
	return true;
}


bitset<mxn> done;

bool CYCLE(){
	for(int i = 0;i<N;i++){
		if(done[i]||head[i] == -1)continue;
		int now = head[i];
		vector<int> v;
		v.push_back(now);
		bool has = false;
		for(int j = 0;j<N;j++){
			if(done[j])return false;
			if(tar[now][j] == 2){
				has = true;
				v.push_back(head[chain.root(j)]);
			}
		}
		if(!has)continue;
		sort(v.begin(),v.end());
		v.erase(unique(v.begin(),v.end()),v.end());
		if(v.size()<=2)return false;
		for(int i = 1;i<v.size();i++){
			add_edge(v[i-1],v[i]);
			cyc.onion(v[i-1],v[i]);
		}
		add_edge(v[0],v.back());
		for(auto &i:v)done[chain.root(i)] = true;
	}
	return true;
}

int construct(std::vector<std::vector<int>> vvv) {
	memset(head,-1,sizeof(head));
	tar = vvv;
	N = tar.size();
	for(int i = 0;i<N;i++){
		for(int j = 0;j<N;j++){
			if(tar[i][j] == 1)chain.onion(i,j);
		}
	}
	ans = vector<vector<int>>(N,vector<int>(N,0));
	for(int i = 0;i<N;i++){
		v[chain.root(i)].push_back(i);
	}
	for(int i = 0;i<N;i++){
		for(int j = 1;j<v[i].size();j++){
			add_edge(v[i][j-1],v[i][j]);
		}
		if(!v[i].empty())head[i] = v[i][0];
	}

	if(!CYCLE())return 0;

	if(!check())return 0;
	build(ans);
	return 1;
}

Compilation message

supertrees.cpp: In function 'bool CYCLE()':
supertrees.cpp:84:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |   for(int i = 1;i<v.size();i++){
      |                 ~^~~~~~~~~
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:108:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  108 |   for(int j = 1;j<v[i].size();j++){
      |                 ~^~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 1372 KB Output is correct
7 Correct 96 ms 26152 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 1372 KB Output is correct
7 Correct 96 ms 26152 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 4 ms 1372 KB Output is correct
13 Correct 96 ms 26160 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2 ms 1116 KB Output is correct
17 Correct 59 ms 16176 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 24 ms 6796 KB Output is correct
21 Correct 100 ms 26180 KB Output is correct
22 Correct 99 ms 25940 KB Output is correct
23 Correct 102 ms 26176 KB Output is correct
24 Correct 96 ms 26192 KB Output is correct
25 Correct 49 ms 16208 KB Output is correct
26 Correct 43 ms 16212 KB Output is correct
27 Correct 103 ms 26196 KB Output is correct
28 Correct 102 ms 26000 KB Output is correct

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 408 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 600 KB Output is correct
8 Correct 4 ms 1372 KB Output is correct
9 Correct 96 ms 26196 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 4 ms 1372 KB Output is correct
13 Correct 97 ms 26192 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2 ms 1116 KB Output is correct
17 Correct 48 ms 16212 KB Output is correct
18 Incorrect 0 ms 344 KB Answer gives possible 1 while actual possible 0
19 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 24 ms 6912 KB Output is correct
5 Correct 97 ms 25964 KB Output is correct
6 Correct 96 ms 26196 KB Output is correct
7 Correct 102 ms 26160 KB Output is correct
8 Incorrect 0 ms 348 KB Answer gives possible 0 while actual possible 1
9 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 1372 KB Output is correct
7 Correct 96 ms 26152 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 4 ms 1372 KB Output is correct
13 Correct 96 ms 26160 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2 ms 1116 KB Output is correct
17 Correct 59 ms 16176 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 24 ms 6796 KB Output is correct
21 Correct 100 ms 26180 KB Output is correct
22 Correct 99 ms 25940 KB Output is correct
23 Correct 102 ms 26176 KB Output is correct
24 Correct 96 ms 26192 KB Output is correct
25 Correct 49 ms 16208 KB Output is correct
26 Correct 43 ms 16212 KB Output is correct
27 Correct 103 ms 26196 KB Output is correct
28 Correct 102 ms 26000 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 408 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 600 KB Output is correct
36 Correct 4 ms 1372 KB Output is correct
37 Correct 96 ms 26196 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 0 ms 344 KB Output is correct
40 Correct 4 ms 1372 KB Output is correct
41 Correct 97 ms 26192 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 2 ms 1116 KB Output is correct
45 Correct 48 ms 16212 KB Output is correct
46 Incorrect 0 ms 344 KB Answer gives possible 1 while actual possible 0
47 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 1372 KB Output is correct
7 Correct 96 ms 26152 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 4 ms 1372 KB Output is correct
13 Correct 96 ms 26160 KB Output is correct
14 Correct 0 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 2 ms 1116 KB Output is correct
17 Correct 59 ms 16176 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 24 ms 6796 KB Output is correct
21 Correct 100 ms 26180 KB Output is correct
22 Correct 99 ms 25940 KB Output is correct
23 Correct 102 ms 26176 KB Output is correct
24 Correct 96 ms 26192 KB Output is correct
25 Correct 49 ms 16208 KB Output is correct
26 Correct 43 ms 16212 KB Output is correct
27 Correct 103 ms 26196 KB Output is correct
28 Correct 102 ms 26000 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 408 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 600 KB Output is correct
36 Correct 4 ms 1372 KB Output is correct
37 Correct 96 ms 26196 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 0 ms 344 KB Output is correct
40 Correct 4 ms 1372 KB Output is correct
41 Correct 97 ms 26192 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 2 ms 1116 KB Output is correct
45 Correct 48 ms 16212 KB Output is correct
46 Incorrect 0 ms 344 KB Answer gives possible 1 while actual possible 0
47 Halted 0 ms 0 KB -