foo.cc: In function 'bool Search(std::vector<int>, int)':
foo.cc:6:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |         for(int i=0;i<v.size();i++)
      |                     ~^~~~~~~~~
foo.cc: In function 'int jishu(int, int, std::string)':
foo.cc:14:13: warning: unused variable 'cnt' [-Wunused-variable]
   14 |         int cnt=0,x=0;
      |             ^~~

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