CF377D Developing Game

#include<bits/stdc++.h>
#define Tp template<typename Ty>
#define Ts template<typename Ty,typename... Ar>
#define W while
#define I inline
#define RI register int
#define LL long long
#define Cn const
#define CI Cn int&
#define gc getchar
#define D isdigit(c=gc())
#define pc(c) putchar((c))
using namespace std;
namespace Debug{
Tp I void _debug(Cn char* f,Ty t){cerr<<f<<'='<<t<<endl;}
Ts I void _debug(Cn char* f,Ty x,Ar... y){W(*f!=',') cerr<<*f++;cerr<<'='<<x<<",";_debug(f+1,y...);}
Tp ostream& operator<<(ostream& os,Cn vector<Ty>& V){os<<"[";for(Cn auto& vv:V) os<<vv<<",";os<<"]";return os;}
#define gdb(...) _debug(#__VA_ARGS__,__VA_ARGS__)
}using namespace Debug;
namespace FastIO{
Tp I void read(Ty& x){char c;int f=1;x=0;W(!D) f=c^'-'?1:-1;W(x=(x<<3)+(x<<1)+(c&15),D);x*=f;}
Ts I void read(Ty& x,Ar&... y){read(x),read(y...);}
Tp I void write(Ty x){x<0&&(pc('-'),x=-x,0),x<10?(pc(x+'0'),0):(write(x/10),pc(x%10+'0'),0);}
Tp I void writeln(Cn Ty& x){write(x),pc('\n');}
}using namespace FastIO;
Cn int N=1e5+10,V=3e5;
int n,id;
struct node{int x,yl,yr;}a[N],Ans,tmp;
I bool operator<(Cn node& x,Cn node& y){return x.x<y.x;}
vector<node> G[V+5];
#define pb push_back
class SegmentTree{
private:
node T[(V+5)<<2];int tg[(V+5)<<2];
#define mid (l+r>>1)
#define PT CI x=1,CI l=1,CI r=V
#define LT x<<1,l,mid
#define RT x<<11,mid+1,r
#define PU(x) (T[x]=max(T[x<<1],T[x<<11]))
I void AP(CI x,CI v){T[x].x+=v,tg[x]+=v;}
I void PD(CI x){tg[x]&&(AP(x<<1,tg[x]),AP(x<<11,tg[x]),tg[x]=0);}
public:
I void B(PT){if(l==r) return T[x]=(node){0,l,l},void();B(LT),B(RT),PU(x);} 
I void U(CI L,CI R,CI v,PT){if(L<=l&&r<=R) return AP(x,v),void();PD(x),L<=mid&&(U(L,R,v,LT),0),R>mid&&(U(L,R,v,RT),0),PU(x);}
I node Q(CI L,CI R,PT){if(L<=l&&r<=R) return T[x];PD(x);if(R<=mid) return Q(L,R,LT);if(L>mid) return Q(L,R,RT);return max(Q(L,R,LT),Q(L,R,RT));}
}T;
int main(){
RI i,l,v,r;for(read(n),i=1;i<=n;i++) read(l,v,r),G[l].pb((node){1,v,r}),G[v+1].pb((node){-1,v,r}),a[i]=(node){v,l,r};
for(T.B(),i=1;i<=V;i++){for(auto j:G[i]) T.U(j.yl,j.yr,j.x);Ans<(tmp=T.Q(1,V))&&(Ans=tmp,id=i);}
for(writeln(Ans.x),i=1;i<=n;i++) a[i].yl<=id&&id<=a[i].x&&a[i].x<=Ans.yl&&Ans.yl<=a[i].yr&&(write(i),pc(' '),0);return pc('\n'),0;
}