foo.cc: In function 'int main()':
foo.cc:9:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(s1);
         ^
In file included from /usr/include/stdio.h:862:0,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:25:11: warning: array subscript has type 'char' [-Wchar-subscripts]
    p[s2[i]][s2[i+1]]++;
           ^
foo.cc:25:20: warning: array subscript has type 'char' [-Wchar-subscripts]
    p[s2[i]][s2[i+1]]++;
                    ^
foo.cc:33:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]>max)
             ^
foo.cc:33:22: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]>max)
                      ^
foo.cc:34:14: warning: array subscript has type 'char' [-Wchar-subscripts]
   max=p[s2[i]][s2[i+1]];
              ^
foo.cc:34:23: warning: array subscript has type 'char' [-Wchar-subscripts]
   max=p[s2[i]][s2[i+1]];
                       ^
foo.cc:40:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]==max&&flag[s2[i]][s2[i+1]]==0)
             ^
foo.cc:40:22: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]==max&&flag[s2[i]][s2[i+1]]==0)
                      ^
foo.cc:40:40: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]==max&&flag[s2[i]][s2[i+1]]==0)
                                        ^
foo.cc:40:49: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(p[s2[i]][s2[i+1]]==max&&flag[s2[i]][s2[i+1]]==0)
                                                 ^
foo.cc:43:15: warning: array subscript has type 'char' [-Wchar-subscripts]
     flag[s2[i]][s2[i+1]]=1;
               ^
foo.cc:43:24: warning: array subscript has type 'char' [-Wchar-subscripts]
     flag[s2[i]][s2[i+1]]=1;
                        ^
foo.cc:9:6: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
  gets(s1);
  ~~~~^~~~
/tmp/ccrzbr6I.o: In function `main':
foo.cc:(.text.startup+0x87): warning: the `gets' function is dangerous and should not be used.

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