Submission #306670

#	Time	Username	Problem	Language	Result	Execution time	Memory
306670		vivaan_gupta	Connecting Supertrees (IOI20_supertrees)	C++14	56 / 100	759 ms	22432 KiB

supertrees

#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <ratio>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <climits>
#include "supertrees.h"
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define in insert
#define vll vector<ll>
#define endl "\n"
#define f first
#define s second
#define pll pair<int,int>
// #define int ll
using namespace std;

 


 
struct DSU
{
	int connected;
	vector<int> par, sz;

	void init(int n) 
	{
		par = sz = vector<int> (n + 1, 0);
		for(int i = 1; i <= n; i++)
			par[i] = i, sz[i] = 1;
		connected = n;
	}

	int getPar(int u)
	{
		while(u != par[u])
		{
			par[u] = par[par[u]];
			u = par[u];
		}
		return u;
	}

	int getSize(int u)
	{
		return sz[getPar(u)];
	}

	void unite(int u, int v)
	{
		int par1 = getPar(u), par2 = getPar(v);

		if(par1 == par2)
			return;

		connected--;

		if(sz[par1] > sz[par2])
			swap(par1, par2);

		sz[par2] += sz[par1];
		sz[par1] = 0;
		par[par1] = par[par2];
	}
};



int construct(std::vector<std::vector<int>> p) {
	DSU g,g2;
	int n = p.size();
	g.init(n-1);
	g2.init(n-1);
	std::vector<std::vector<int>> ans;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		ans.push_back(row);
	}
	
	for(int i =0;i<n;i++){
		for(int j =i+1;j<n;j++){
			if(p[i][j] >= 1){
				g.unite(i,j);
			}
			if(p[i][j] == 1){
				g2.unite(i,j);
			}
		}
	}
	map<int,int> col;
	vector<int> wow[n+1];
	int c = 1;
	for(int i =0;i<n;i++){
		int op = g.getPar(i);
		if(col[op] == 0){
			col[op] = c;
			c++;				
		}
		wow[col[op]].pb(i);
	}
	c--;
	for(int i =0;i<n;i++){
		for(int j =0;j<n;j++){
			ans[i][j] = 0;
		}
	}
	for(int i = 1;i<=c;i++){
		if(wow[i].size() == 1) continue;
		set<int> contains;
		bool ok = true;
		for(int j = 0;j<wow[i].size();j++){
			contains.in(wow[i][j]);
			for(int k =j+1;k<wow[i].size();k++){
				if(p[wow[i][j]][wow[i][k]] == 0) return 0;
				for(int l =0;l<wow[i].size();l++){
					// if(l == k || l == j) continue;
					if(p[wow[i][j]][wow[i][k]] == 2 && (p[wow[i][j]][wow[i][l]] == 1 && p[wow[i][l]][wow[i][k]] == 1))
						return 0;
				}
			}
		}
		if(contains.size() == 1 && *(contains.begin()) == 2){
			if(wow[i].size() == 2) return 0;
		}
		col.clear();
		int gg = 1;
		vector<int> chains[n+2];
		for(int j = 0;j<wow[i].size();j++){
			int op = g2.getPar(wow[i][j]);
			if(col[op] == 0){
				col[op] = gg;
				gg++;
			}
			chains[col[op]].pb(wow[i][j]);
		}
		vector<int> v;
		for(int j =1;j<gg;j++){
			
			// if(!poss) return 0;
			for(int k=0;k<chains[j].size()-1;k++){
				ans[chains[j][k]][chains[j][k+1]] = 1;
				ans[chains[j][k+1]][chains[j][k]] = 1;
			}			
			v.pb(chains[j].back());
		}

		for(int i= 0;i<v.size()-1;i++){
			ans[v[i]][v[i+1]] = 1;
			ans[v[i+1]][v[i]] = 1;
		}
		if(v.size() == 1) continue;
		ans[v.back()][v[0]] = 1;
		ans[v[0]][v.back()] = 1;
	}



	

	build(ans);
	return 1;
}


// void solve(){
	
// }
// signed main(){
 
//     ios_base::sync_with_stdio(0);
//     cin.tie(NULL);
//      // freopen(".in","r",stdin);freopen(".out","w",stdout);
    
//      ll tt=1;   
//      // cin >> tt;
//     while(tt--){    
//         solve();
//     }    
// }

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:140:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  140 |   for(int j = 0;j<wow[i].size();j++){
      |                 ~^~~~~~~~~~~~~~
supertrees.cpp:142:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |    for(int k =j+1;k<wow[i].size();k++){
      |                   ~^~~~~~~~~~~~~~
supertrees.cpp:144:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  144 |     for(int l =0;l<wow[i].size();l++){
      |                  ~^~~~~~~~~~~~~~
supertrees.cpp:157:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  157 |   for(int j = 0;j<wow[i].size();j++){
      |                 ~^~~~~~~~~~~~~~
supertrees.cpp:169:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  169 |    for(int k=0;k<chains[j].size()-1;k++){
      |                ~^~~~~~~~~~~~~~~~~~~
supertrees.cpp:176:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  176 |   for(int i= 0;i<v.size()-1;i++){
      |                ~^~~~~~~~~~~
supertrees.cpp:139:8: warning: unused variable 'ok' [-Wunused-variable]
  139 |   bool ok = true;
      |        ^~

• Subtask 1: 11 / 11
• Subtask 2: 10 / 10
• Subtask 3: 0 / 19
• Subtask 4: 35 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4