Submission #470336

#	Time	Username	Problem	Language	Result	Execution time	Memory
470336		jazzup	Connecting Supertrees (IOI20_supertrees)	C++14	Compilation error	0 ms	0 KiB

supertrees

#include"supertrees.h"
#include<vector>

using namespace std;

int par[1010];
vector<int> heads;

int findPar(int n){
	if(par[n]==n)return n;

	return par[n]=findPar(par[n]);
}

bool c[1010];

int construct(vector<vector<int> > p) {
	for(int i=0;i<=n;i++){
		par[i]=i;
	}
	int n = p.size();
	vector<vector<int> > answer;
	for (int i = 0; i < n; i++) {
		vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}

	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			answer[i].push_back(0);
		}
	}

	for(int i=0;i<n-1;i++){
		for(int j=i+1;j<n;j++){
			if(p[i][j]==3)return 0;

			if(p[i][j]==1){
				par[j]=findPar(i);
				answer[j][par[j]]=1;
				answer[par[j]][j]=1;
			}
		}
	}

	for(int i=0;i<n-1;i++){
		for(int j=i+1;j<n;j++){
			if(p[i][j]==2){
				if(findPar(i)==findPar(j)){
					return 0;
				}

				c[findPar(i)]=true;
				c[findPar(j)]=true;
			}
		}
	}

	for(int i=0;i<n;i++){
		if(c[i])heads.push_back(i);
	}

	for(int i=0;i<heads.size()-1;i++){
		answer[heads[i]][heads[i+1]]=1;
		answer[heads[i+1]][heads[i]]=1;
	}

	answer[heads[heads.size()-1]][heads[0]]=1;
	answer[heads[0]][heads[heads.size()-1]]=1;

	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:18:17: error: 'n' was not declared in this scope
   18 |  for(int i=0;i<=n;i++){
      |                 ^
supertrees.cpp:64:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |  for(int i=0;i<heads.size()-1;i++){
      |              ~^~~~~~~~~~~~~~~