Method ST

Data Structures/Permutation Tree.cpp:10–10

#define rc ((n << 1) | 1)
  int t[4 * N], lazy[4 * N];
  ST() {}
  inline void push(int n, int b, int e) {
    if (lazy[n] == 0) return;
    t[n] = t[n] + lazy[n];