func_code_string: #include <bits/stdc++.h>   using namespace std;   const int G = 2520;   const int B = 41;   const int MAXN = B * G;   unsigned char S[G][B], ps[B + 1][G][4], mp[256];   string e;   void Pre() {     mp[ A ] = 0;     mp[ G ] = 1;     mp[ T ] = 2;     mp[ C ] = 3;   }   void build(int g) {     for (int i = 0; i < 4; i++) {       ps[0][g][i] = 0;       for (int j = 0; j < B; j++) ps[j + 1][g][i] = ps[j][g][i] + (S[g][j] == i);     }   }   void chng(int p, char c) {     S[p % G][p / G] = c;     build(p % G);   }   inline int nxt(int x, int y) {     if (x % G <= y)       return (x + (y - x % G)) / G;     else       return (x + (G + y - x % G)) / G;   }   inline int get(int g, int l, int r, int x) { return ps[r][g][x] - ps[l][g][x]; }   int t(int i) { return e[i % e.size()]; }   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     Pre();     string s;     cin >> s;     for (int i = 0; i < s.size(); i++) S[i % G][i / G] = mp[s[i]];     for (int i = 0; i < G; i++) build(i);     int q;     cin >> q;     while (q--) {       int type;       cin >> type;       if (type == 1) {         int x;         char c;         cin >> x >> c;         x--;         chng(x, mp[c]);       } else {         int l, r;         cin >> l >> r >> e;         l--;         int ans = 0;         for (int i = 0; i < G; i++) {           ans += get(i, nxt(l, i), nxt(r, i), mp[t((i - l % G + G) % G)]);         }         cout << ans << endl;       }     }   }   