func_code_string: #include <bits/stdc++.h>   using namespace std;   int it[200041], n, io;   int down(int x) {     int s = 0, rs = x;     while (x <= n * 2) {       s = max(it[x], s);       x += x & (-x);     }     return s;   }   void up(int x, int u) {     while (x > 0) {       it[x] = max(it[x], u);       x -= x & (-x);     }   }   int main() {     int i, a[100005], o = 0, co;     cin >> n;     for (i = 0; i < n; i++) cin >> a[i];     for (i = n - 1; i >= 0; i--) {       co = down(a[i]);       up(a[i], co + 1);       o = max(co + 1, o);     }     cout << o << endl;   }   