> #include <iostream>
> using namespace std;
> const int MaxN=2000; 
> struct Bugs
> {
> 	int parent;
> 	int sex;
> }p[MaxN+1];
> int Find(int x)
> {    int i,tmp1,tmp2,sex1,sex2;
> 	 sex1=0;
> 	 sex2=0;
>      for(i=x;p[i].parent!=i;i=p[i].parent)
>      	sex1+=p[i].sex;
>      while(i!=x)   
>      {
>       tmp1=p[x].parent;
>       tmp2=p[x].sex;
> 	  p[x].parent=i;
>       p[x].sex=(sex1-sex2)%2;
>       x=tmp1;
>       sex2+=tmp2;
>      }
>      return i;
> }     
> bool Union(int R1,int R2,int r1,int r2)
> {
> 	if(R1==R2&&p[r1].sex!=p[r2].sex)
> 		return true;
> 	if(R1!=R2)
> 		{
> 			p[R1].parent=R2;
> 			int i;
> 			for(i=0;i<=1;i++)
> 				if((p[r1].sex+i+p[r2].sex)%2==1)
> 					break;
> 			p[R1].sex=i;
> 			return true;
> 		}
> 	return false;
> }
> int main()
> {
> 	int n,i,j;
> 	int N,K;
> 	bool right;
> 	int r1,r2;
> 	scanf("%d",&n);
> 	for(i=0;i<n;i++)
> 	{
> 		scanf("%d%d",&N,&K);
> 		for(j=1;j<=N;j++)
> 		{	
> 			p[j].parent=j;
> 			p[j].sex=0;
> 		}
> 		right=true;
> 		for(j=1;j<=K;j++)
> 		{
> 			scanf("%d%d",&r1,&r2);
> 			if(right==false) continue;
> 			
> 			if(Union(Find(r1),Find(r2),r1,r2)==false) right=false;	
> 		}
> /**********************************************************/		
>                 cout<<"Scenario #"<<i+1<<":"<<endl;
> 		if(right==true) cout<<"No Suspicious bugs found!"<<endl;
> 		else cout<<"Suspicious bugs found!"<<endl;
> 		cout<<endl;
> /**********************************************************/
>         }
> 	//system("Pause");
> }
> 
> 
> 这段程序交上去会WA，但如果把两条注释线间的输出部分改为
> printf("Scenario #%d:\n",i+1);
> 		if(right==false)
> 		{
> 			printf("Suspicious bugs found!\n\n");
> 		}
> 		else
> 		{
> 			printf("No suspicious bugs found!\n\n");
> 		}
> 就AC了，这实在有点看不明白，printf和cout到底有什么区别？
注意输出的大小写