题解代码中：

for (int l1 = 0; l1 < s.size(); ++l1) if (s.substr(l1, 7) == "Genshin") {
  for (int l2 = l1; l1 < s.length(); ++l2) if (s.substr(l2, 6) == "player") {
    ++ans;
  }
}

第二行$l_1$应该为$l_2$