#include <bits/stdc++.h>   using namespace std;   template <typename T, typename U>   std::istream& operator>>(std::istream& i, pair<T, U>& p) {     i >> p.first >> p.second;     return i;   }   template <typename T>   std::istream& operator>>(std::istream& i, vector<T>& t) {     for (auto& v : t) {       i >> v;     }     return i;   }   template <typename T, typename U>   std::ostream& operator<<(std::ostream& o, const pair<T, U>& p) {     o << p.first <<     << p.second;     return o;   }   template <typename T>   std::ostream& operator<<(std::ostream& o, const vector<T>& t) {     if (t.empty()) o <<   n ;     for (size_t i = 0; i < t.size(); ++i) {       o << t[i] <<    n [i == t.size() - 1];     }     return o;   }   template <typename T>   using minheap = priority_queue<T, vector<T>, greater<T>>;   template <typename T>   using maxheap = priority_queue<T, vector<T>, less<T>>;   template <typename T>   bool in(T a, T b, T c) {     return a <= b && b < c;   }   unsigned int logceil(int first) {     return 8 * sizeof(int) - __builtin_clz(first);   }   namespace std {   template <typename T, typename U>   struct hash<pair<T, U>> {     hash<T> t;     hash<U> u;     size_t operator()(const pair<T, U>& p) const {       return t(p.first) ^ (u(p.second) << 7);     }   };   }  // namespace std   template <typename T, typename F>   T bsh(T l, T h, const F& f) {     T r = -1, m;     while (l <= h) {       m = (l + h) / 2;       if (f(m)) {         l = m + 1;         r = m;       } else {         h = m - 1;       }     }     return r;   }   template <typename F>   double bshd(double l, double h, const F& f, double p = 1e-9) {     unsigned int r = 3 + (unsigned int)log2((h - l) / p);     while (r--) {       double m = (l + h) / 2;       if (f(m)) {         l = m;       } else {         h = m;       }     }     return (l + h) / 2;   }   template <typename T, typename F>   T bsl(T l, T h, const F& f) {     T r = -1, m;     while (l <= h) {       m = (l + h) / 2;       if (f(m)) {         h = m - 1;         r = m;       } else {         l = m + 1;       }     }     return r;   }   template <typename F>   double bsld(double l, double h, const F& f, double p = 1e-9) {     unsigned int r = 3 + (unsigned int)log2((h - l) / p);     while (r--) {       double m = (l + h) / 2;       if (f(m)) {         h = m;       } else {         l = m;       }     }     return (l + h) / 2;   }   template <typename T>   T gcd(T a, T b) {     if (a < b) swap(a, b);     return b ? gcd(b, a % b) : a;   }   template <typename T>   class vector2 : public vector<vector<T>> {    public:     vector2() {}     vector2(size_t a, size_t b, T t = T())         : vector<vector<T>>(a, vector<T>(b, t)) {}   };   template <typename T>   class vector3 : public vector<vector2<T>> {    public:     vector3() {}     vector3(size_t a, size_t b, size_t c, T t = T())         : vector<vector2<T>>(a, vector2<T>(b, c, t)) {}   };   template <typename T>   class vector4 : public vector<vector3<T>> {    public:     vector4() {}     vector4(size_t a, size_t b, size_t c, size_t d, T t = T())         : vector<vector3<T>>(a, vector3<T>(b, c, d, t)) {}   };   template <typename T>   class vector5 : public vector<vector4<T>> {    public:     vector5() {}     vector5(size_t a, size_t b, size_t c, size_t d, size_t e, T t = T())         : vector<vector4<T>>(a, vector4<T>(b, c, d, e, t)) {}   };   template <typename F>   struct NoOp {     void setup(unsigned int) {}     void op(F& p, F n, unsigned int, unsigned int) { p = n; }     void down(F&, F&, F&, unsigned int, unsigned int) {}   };   template <typename F, typename SetOp, typename PowerOp>   struct Lazy {     void setup(unsigned int s) {       this->s = s;       L = new F[s]();     }     void down(F& u, F& l, F& r, unsigned int i, unsigned int s) {       op(l, L[i], i << 1, s >> 1);       op(r, L[i], i << 1 | 1, s >> 1);       L[i] = 0;     }     void op(F& p, F n, unsigned int i, unsigned int s) {       p = sop(p, pop(n, s));       if (i < this->s) this->L[i] = sop(this->L[i], n);     }     SetOp sop;     PowerOp pop;     F* L;     unsigned int s;   };   template <typename F, typename CombineOp, typename ModifyOp = NoOp<F>>   struct SegTree {     void setup(unsigned int s, F def) {       n = 1 << logceil(s);       T = vector<F>(2 * n, def);       for (unsigned int i = n - 1; i > 0; i--)         T[i] = cop(T[i << 1], T[i << 1 | 1]);       mop.setup(2 * n);     }     void setup(vector<F>& data, F def = F()) {       n = 1 << logceil(data.size());       T = vector<F>(2 * n, def);       copy(data.begin(), data.end(), T.begin() + n);       for (unsigned int i = n - 1; i > 0; i--)         T[i] = cop(T[i << 1], T[i << 1 | 1]);       mop.setup(2 * n);     }     inline void put(unsigned int first, F n) { put(first, first, n); }     inline void put(unsigned int from, unsigned int to, F v) {       put2(from, to + 1, v, 1, n);     }     inline F get(unsigned int first) { return get(first, first); }     inline F get(unsigned int from, unsigned int to) {       return get2(from, to + 1, 1, n);     }     void put2(unsigned int from, unsigned int to, F v, unsigned int i,               unsigned int s) {       if (from == 0 && to == s) {         mop.op(T[i], v, i, s);         return;       }       mop.down(T[i], T[i << 1], T[i << 1 | 1], i, s);       s >>= 1;       i <<= 1;       if (to <= s) {         put2(from, to, v, i, s);       } else if (from >= s) {         put2(from - s, to - s, v, i | 1, s);       } else {         put2(from, s, v, i, s);         put2(0, to - s, v, i | 1, s);       }       T[i >> 1] = cop(T[i], T[i | 1]);     }     F get2(unsigned int from, unsigned int to, unsigned int i, unsigned int s) {       while (true) {         if (from == 0 && to == s) return T[i];         mop.down(T[i], T[i << 1], T[i << 1 | 1], i, s);         s >>= 1;         i <<= 1;         if (to > s) {           to -= s;           if (from >= s) {             from -= s;             i |= 1;           } else             return cop(get2(from, s, i, s), get2(0, to, i | 1, s));         }       }     }     unsigned int n;     vector<F> T;     CombineOp cop;     ModifyOp mop;   };   template <typename F>   struct AddOp {     F operator()(F a, F b) { return a + b; }   };   template <typename F>   struct MinOp {     F operator()(F a, F b) { return std::min(a, b); }   };   template <typename F>   struct MaxOp {     F operator()(F a, F b) { return std::max(a, b); }   };   template <typename F>   struct MultiplyOp {     F operator()(F a, F b) { return a * b; }   };   template <typename F>   struct MultOp {     F operator()(F a, unsigned int b) { return a * b; }   };   template <typename F>   struct IdempOp {     F operator()(F a, unsigned int b) { return a; }   };   template <typename F>   struct InverseOp {     F operator()(F a, F b) { return b ? b - a : a; }   };   template <typename T>   using AddSumTree = SegTree<T, AddOp<T>, Lazy<T, AddOp<T>, MultOp<T>>>;   template <typename T>   using AddMaxTree = SegTree<T, MaxOp<T>, Lazy<T, AddOp<T>, IdempOp<T>>>;   template <typename T>   using AddMinTree = SegTree<T, MinOp<T>, Lazy<T, AddOp<T>, IdempOp<T>>>;   template <typename T>   using AssignMinTree = SegTree<T, MinOp<T>, Lazy<T, MinOp<T>, IdempOp<T>>>;   template <typename T>   using AssignMaxTree = SegTree<T, MaxOp<T>, Lazy<T, MaxOp<T>, IdempOp<T>>>;   template <typename T>   using XorTree = SegTree<T, AddOp<T>, Lazy<T, InverseOp<T>, MultOp<T>>>;   template <typename T>   using SetMinTree = SegTree<T, MinOp<T>>;   template <typename T>   using SetMaxTree = SegTree<T, MaxOp<T>>;   template <typename T>   using SetMulTree = SegTree<T, MultiplyOp<T>>;   class developinggame {    public:     void solve(istream& cin, ostream& cout) {       int N;       cin >> N;       vector<pair<int, std::pair<int, int>>> P(N);       cin >> P;       vector<vector<int>> In(3e5 + 1), Out(3e5 + 1);       for (int i = 0; i < N; ++i) {         In[P[i].first].push_back(i);         Out[P[i].second.first].push_back(i);       }       AddMaxTree<int> A;       A.setup(3e5 + 1, 0);       std::pair<int, int> best{-1, 0};       for (int i = 1; i <= 3e5; ++i) {         for (int j : In[i]) A.put(P[j].second.first, P[j].second.second, 1);         int g = A.get(0, 3e5);         best = max(best, {g, i});         for (int j : Out[i]) A.put(P[j].second.first, P[j].second.second, -1);       }       int l = best.second;       vector<int> X(3e5 + 2, 0);       for (auto& p : P) {         if (p.first <= l && p.second.first >= l) {           X[p.second.first]++;           X[p.second.second + 1]--;         }       }       std::pair<int, int> ans{-1, 0};       for (int i = 1; i <= 3e5; ++i) {         X[i] += X[i - 1];         ans = max(ans, {X[i], i});       }       int first = ans.second;       vector<int> Ans;       for (int i = 0; i < N; ++i) {         auto& p = P[i];         if (p.first <= l && p.second.first >= l && p.second.first <= first &&             p.second.second >= first) {           Ans.push_back(i + 1);         }       }       cout << best.first <<   n  << Ans;     }   };   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     cout.tie(nullptr);     developinggame solver;     std::istream& in(std::cin);     std::ostream& out(std::cout);     solver.solve(in, out);     return 0;   }