UVa 10004 - Bicoloring

#include <iostream>
#include <cstring>
using namespace std;
bool G[210][210];
int main()
{
int point,c,p;
int color[210];
while(cin>>point && point)
{
cin>>c;
memset(G,0,sizeof(G));
for(int i=0; i<c; i++)
{
int a,b;
cin>>a>>b;
G[a][b]=1;
G[b][a]=1;
}
memset(color,-1,sizeof(color));
int k=0;
for(int i=0; i<point; i++)
{
for(int j=0; j<point; j++)
{
if(G[i][j] && k == 0)
{
color[i]=0;
color[j]=!color[i];
k=1;
}
else if(G[i][j])
{
if(color[i]==0||color[i]==1)
color[j]=!color[i];
}
}
}
p=0;
for(int i=0; i<point; i++)
{
for(int j=0; j<point; j++)
{
if(G[i][j] && color[i] == color[j])
{
cout<<"NOT BICOLORABLE."<<endl;
p=1;
break;
}
}
if(p)
break;
}
if(!p)
cout<<"BICOLORABLE."<<endl;
}
return 0;
}