#pragma GCC optimize("Ofast") #pragma GCC target("avx2") char*mmap(); #define rd(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} char wbuf[1<<25]; #define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;} #define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;} #define wt(v) WTHI(v) #define rep(v,e) for(int v=0;v>8|a[i].val<<24; } } void radix_sort(S*a,int n){ radix_sort_aux(a,a+n,n); radix_sort_aux(a+n,a,n); radix_sort_aux(a,a+n,n); radix_sort_aux(a+n,a,n); } S a[400000]; main(){ char*rp=mmap(0l,1l<<25,1,2,0,0ll); rd(n); rep(i,n){ a[i].index=i; rd(ai); a[i].val=ai; } radix_sort(a,n); char*wp=wbuf; *wp++='1'; int on=0; for(int i=0;i0;i-=2){ if(on){ *wp++=' '; wt(a[i].index+1); } on^=a[i].index==0; } for(int i=0;i0;i-=2){ if(on){ *wp++=' '; wt(a[i].index+1); } on^=a[i].index==0; } *wp++='\n'; write(1,wbuf,wp-wbuf); _exit(0); }