这为什么WA？

红题？？

冒泡排序我不会？？

#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,a[1005],s,t;
signed main(){
	while(cin>>n&&n!=EOF){
	    sizeof(a,0,sizeof(a));
	    for(int i=1;i<=n;i++) cin>>a[i];
	    s=0;
	    for(int i=1;i<=n;i++)
	    	for(int j=i+1;j<=n;j++)
	    		if(a[i]>a[j])
	    			swap(a[i],a[j]),s++;
	    cout<<"Minimum exchange operations : "<<s<<"\n";
//	    cout<<"Minimum exchange operations : "<<s<<endl;
	}
}