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

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) {unsigned _z=v,_n=0;long _d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define rep(v,e) for(typeof(e) v=0;v<e;++v)
#define reps(v,s,e) for(typeof(e) v=s;v<e;++v)

char wbuf[1<<25];
int n;
int p[200000];
int v[200001];
int s[200001];

void f1(){
	rd_init();
	n=rd();
	rep(i,n){
		p[i]=rd();
		v[p[i]]=i;
	}
}

void f2(){
	char*wp=wbuf;
	reps(a,1,n+1){
		int i=v[a];
		if(!s[i]){
			int j,k;
			for(j=i+1;s[j];j=s[j]);
			for(k=i+1;s[k];k=s[k])s[k]=j;
			if(j<n){
				wt(a);
				*wp++=' ';
				wt(p[j]);
				*wp++=' ';
				s[i]=s[j]=j+1;
			}
		}
	}
	write(1,wbuf,wp-wbuf);
}

int main(){
	f1();
	f2();
	_exit(0);
}