foo.cc: In function 'int main()':
foo.cc:8:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for(int i=0;i<strlen(sa);i++)
      |                     ~^~~~~~~~~~~
foo.cc:11:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |             if(ym[z]!=0&&ym[z]!=sb[i]){cout<<"Failed";return 0;}
      |                   ^
foo.cc:11:29: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |             if(ym[z]!=0&&ym[z]!=sb[i]){cout<<"Failed";return 0;}
      |                             ^
foo.cc:12:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   12 |             if(ym[z]==0)ym[z]=sb[i];//ym[]下标是数字,为最后输出作准备    }
      |                   ^
foo.cc:12:28: warning: array subscript has type 'char' [-Wchar-subscripts]
   12 |             if(ym[z]==0)ym[z]=sb[i];//ym[]下标是数字,为最后输出作准备    }
      |                            ^
foo.cc:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   21 |          for(int i=0;i<strlen(sy);i++)cout<<ym[sy[i]];
      |                      ~^~~~~~~~~~~
foo.cc:21:52: warning: array subscript has type 'char' [-Wchar-subscripts]
   21 |          for(int i=0;i<strlen(sy);i++)cout<<ym[sy[i]];
      |                                                ~~~~^

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