/in/foo.cc: In function 'int main()':
/in/foo.cc:48:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=1;i<=strlen(s1);i++){
               ~^~~~~~~~~~~~
/in/foo.cc:56:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if (st1>n) st1-=n;if (st2>n) st2-=n;
   ^~
/in/foo.cc:56:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   if (st1>n) st1-=n;if (st2>n) st2-=n;
                     ^~
/in/foo.cc: In function 'int findst(int)':
/in/foo.cc:42:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^