Submission #367113

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
367113	2021-02-16T10:12:59 Z	MilosMilutinovic	Connecting Supertrees (IOI20_supertrees)	C++14	Compilation error	0 ms	0 KB

supertrees

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=1050;
vector<int> E[N];
vector<vector<int>> p;
void AddEdge(int u,int v){E[u].pb(v);E[v].pb(u);}
vector<int> Euler;
bool was[N];
void DFS1(int u){
	was[u]=true,Euler.pb(u);
	for(int v:E[u])if(!was[v]&&p[u][v]==1)DFS1(v);
}
int construct(vector<vector<int>> P){
	p=P;int n=(int)P.size();
	bool one=false,two=false;
	for(int i=0;i<n;i++)for(int j=0;j<n;j++)if(p[i][j]==1)one=true;
	for(int i=0;i<n;i++)for(int j=0;j<n;j++)if(p[i][j]==2)two=true;
	int ans[n][n];
	if(!one&&!two){build(ans);return 1;}
	if(one&&!two){
		for(int i=0;i<n;i++){
			if(!was[i]){
				DFS1(i);
				if((int)Euler.size()==1)continue;
				for(int x:Euler)for(int y:Euler)if(x!=y&&p[x][y]==0)return 0;
				for(int i=1;i<(int)Euler.size();i++){
					int x=Euler[i],y=Euler[i-1];
					ans[x][y]=ans[y][x]=1;
				}
				Euler.clear();
			}
		}
		build(ans);
		return 1;
	}
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:20:17: error: 'build' was not declared in this scope
   20 |  if(!one&&!two){build(ans);return 1;}
      |                 ^~~~~
supertrees.cpp:34:3: error: 'build' was not declared in this scope
   34 |   build(ans);
      |   ^~~~~
supertrees.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type]
   37 | }
      | ^