foo.cc: In function 'int main()':
foo.cc:17:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   cin>>a[i]+1;
        ~~~~^~
foo.cc:20:16: warning: array subscript has type 'char' [-Wchar-subscripts]
    f[j][a[i][j]]++;
                ^
foo.cc:24:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   cin>>s+1;
        ~^~
foo.cc:27:13: warning: array subscript has type 'char' [-Wchar-subscripts]
    f[j][s[j]]++;
             ^
foo.cc:34:16: warning: array subscript has type 'char' [-Wchar-subscripts]
    f[j][a[i][j]]--;
                ^
foo.cc:40:16: warning: array subscript has type 'char' [-Wchar-subscripts]
    f[j][a[i][j]]++;
                ^

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