Submission #927603

#	Time	Username	Problem	Language	Result	Execution time	Memory
927603		MrDeboo	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	1 ms	604 KiB

supertrees

#include "bits/stdc++.h"
#include "supertrees.h"
using namespace std;
int dsu[1000];
vector<int>vct[1000][2];
vector<vector<int>>ans;
vector<vector<int>>p;
int fath(int in){
	return dsu[in]=(dsu[in]==in?in:fath(dsu[in]));
}
int slv(vector<int>v){
	for(auto &i:v){
		for(auto &w:v){
			if(!p[i][w])return 0;
		}
	}
	vector<int>V;
	vector<bool>vis(p.size());
	for(int i=0;i<v.size();i++){
		if(vis[i])continue;
		int I=i;
		for(int w=0;w<v.size();w++){
			if(p[v[i]][v[w]]==1&&!vis[w]){
				bool bl=1;
				for(int j=0;j<v.size();j++){
					if(v[j]==v[i]||v[j]==v[w])continue;
					if(p[v[j]][v[i]]!=p[v[j]][v[w]])bl=0;
				}
				if(bl){
					vis[w]=1;
					ans[v[I]][v[w]]=1;
					ans[v[w]][v[I]]=1;
					I=w;
				}
			}
		}
		V.push_back(i);
		vis[i]=1;
	}
	v=V;
	for(int i=0;i<v.size();i++){
		for(int w=i+1;w<v.size();w++){
			if(p[v[i]][v[w]]!=2)return 0;
		}
	}
	for(int i=0;i<v.size();i++){
		ans[v[i]][v[(i+1)%v.size()]]=1;
		ans[v[(i+1)%v.size()]][v[i]]=1;
	}
	return 1;
}
int construct(std::vector<std::vector<int>> P){
	for(auto &i:P){
		for(auto &w:i){
			if(w>2)return 0;
		}
	}
	for(auto &i:P)p.push_back(i);
	int n=p.size();
	for(int i=0;i<n;i++)dsu[i]=i;
	for(int i=0;i<n;i++){
		for(int w=0;w<n;w++){
			if(i==w)continue;
			vct[i][p[i][w]-1].push_back(w);
		}
	}
	for(int i=0;i<n;i++){
		vector<int>v(n);
		ans.push_back(v);
	}
	vector<bool>vis(n);
	for(int i=0;i<n;i++){
		for(int w=0;w<n;w++){
			if(vis[i]||vis[w]||i==w)continue;
			if(p[i][w]){
				deque<int>dq={i};
				vector<int>vc;
				while(dq.size()){
					int a=dq.front();
					vc.push_back(a);
					dq.pop_front();
					for(auto &j:vct[a][1]){
						if(!vis[j]){
							vis[j]=1;
							dq.push_back(j);
						}
					}
					for(auto &j:vct[a][0]){
						if(!vis[j]){
							vis[j]=1;
							dq.push_back(j);
						}
					}
				}
				if(!slv(vc))return 0;
			}
		}
	}
	build(ans);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int slv(std::vector<int>)':
supertrees.cpp:19:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |  for(int i=0;i<v.size();i++){
      |              ~^~~~~~~~~
supertrees.cpp:22:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   for(int w=0;w<v.size();w++){
      |               ~^~~~~~~~~
supertrees.cpp:25:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(int j=0;j<v.size();j++){
      |                 ~^~~~~~~~~
supertrees.cpp:41:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |  for(int i=0;i<v.size();i++){
      |              ~^~~~~~~~~
supertrees.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   for(int w=i+1;w<v.size();w++){
      |                 ~^~~~~~~~~
supertrees.cpp:46:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for(int i=0;i<v.size();i++){
      |              ~^~~~~~~~~

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