foo.cc: In function 'void init(std::vector<int>&)':
foo.cc:10:24: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   10 |         for (char i; i = cin.get();) {
      |                      ~~^~~~~~~~~~~
foo.cc: In function 'void print1(std::vector<int>&)':
foo.cc:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for (int i = 0; i < n.size(); i++) {
      |                         ~~^~~~~~~~~~
foo.cc: In function 'void getnum(const std::vector<int>&, std::vector<int>&, int)':
foo.cc:35:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if (k > num.size()) {
      |             ~~^~~~~~~~~~~~
foo.cc:36:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |                 for (int i = 0; i < k - num.size(); i++)
      |                                 ~~^~~~~~~~~~~~~~~~
foo.cc: In function 'bool chengfa(std::vector<int>&, std::vector<int>&, std::vector<int>&, int)':
foo.cc:72:35: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   72 |                 if (result.size() >= k) break;
      |                     ~~~~~~~~~~~~~~^~~~
foo.cc: In function 'void getnum1(const std::vector<int>&, std::vector<int>&, int)':
foo.cc:96:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |         if (k > num.size()) {
      |             ~~^~~~~~~~~~~~
foo.cc:99:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |                 for (int i = 0; i < k - num.size(); i++)
      |                                 ~~^~~~~~~~~~~~~~~~
foo.cc: In function 'int getresult(std::vector<int>&, int)':
foo.cc:181:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  181 |         for (int j = 0; j < circle.size(); j++)
      |                         ~~^~~~~~~~~~~~~~~

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