#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char rbuf[1<<28];
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

void bucket_sort(unsigned*a,unsigned*b,int n){
	int c[256];
	for(int i=0;i<256;++i){
		c[i]=0;
	}
	for(int i=0;i<n;++i){
		++c[a[i]>>8];
	}
	int t=0;
	for(int i=0;i<256;++i){
		int u=c[i];
		c[i]=t;
		t+=u;
	}
	for(int i=0;i<n;++i){
		b[c[a[i]>>8]++]=a[i]&255;
	}
}

a[101],b[101];
r[100000],rn;

main(){
	read(0,rbuf,sizeof rbuf);
	char*rp=rbuf;
	RD(n);
	for(int i=0;i<n;++i){
		RD(ai);
		a[i]=ai<<8|i;
	}
	bucket_sort(a,b,n);
	for(int i=0;i<n;++i){
		while(b[i]!=i){
			int t=b[i];
			b[i]=b[t];
			b[t]=t;
			r[rn++]=i;
			r[rn++]=t;
		}
	}
	printf("%d\n",rn/2);
	for(int i=rn;i;){
		i-=2;
		printf("%d %d\n",r[i],r[i+1]);
	}
}