foo.cc: In function 'int main()':
foo.cc:7:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
    7 |         for(int i=0;i<strlen(ch);i++)
      |                     ~^~~~~~~~~~~
foo.cc:10:40: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   10 |                         for(int j=i+1;j<strlen(ch);j++)
      |                                       ~^~~~~~~~~~~

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