Submission #377334

#	Time	Username	Problem	Language	Result	Execution time	Memory
377334		autumn_eel	Connecting Supertrees (IOI20_supertrees)	C++14	19 / 100	274 ms	24300 KiB

supertrees

#include "supertrees.h"

#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;

struct UnionFind{
	vector<int>par;
	UnionFind(int n){
		par=vector<int>(n);
		rep(i,n)par[i]=i;
	}
	int find(int x){
		return par[x]==x?x:par[x]=find(par[x]);
	}
	void unite(int x,int y){
		x=find(x);y=find(y);
		par[x]=y;
	}
	bool same(int x,int y){
		return find(x)==find(y);
	}
};
static vector<int>v[2000];

int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}
	UnionFind uf(n);
	rep(i,n)rep(j,n){
		if(p[i][j])uf.unite(i,j);
	}
	rep(i,n){
		v[uf.find(i)].push_back(i);
	}
	rep(i,n)rep(j,n){
		if(i==j)continue;
		if(uf.same(i,j)&&!p[i][j])return 0;
	}
	rep(i,n){
		if(v[i].size()>1){
			if(v[i].size()==2)return 0;
			rep(j,v[i].size()-1){
				answer[v[i][j]][v[i][j+1]]=1;
				answer[v[i][j+1]][v[i][j]]=1;
			}
			answer[v[i].front()][v[i].back()]=1;
			answer[v[i].back()][v[i].front()]=1;
		}
	}
	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:4:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define rep(i,n)for(int i=0;i<(n);i++)
      |                              ^
supertrees.cpp:48:4: note: in expansion of macro 'rep'
   48 |    rep(j,v[i].size()-1){
      |    ^~~

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