/in/foo.cc: In function 'int main()':
/in/foo.cc:12:32: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'int' [-Wformat=]
             scanf("%s",a[i][21]);
                                ^
/in/foo.cc:16:14: warning: self-comparison always evaluates to true [-Wtautological-compare]
     for(i=1;i<=i;i++){
             ~^~~
/in/foo.cc:20:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
       if(sum>=11||sun>=11&&sum-sun>2||sun-sum>2){
                   ~~~~~~~^~~~~~~~~~~
/in/foo.cc:12:31: warning: array subscript is above array bounds [-Warray-bounds]
             scanf("%s",a[i][21]);
                        ~~~~~~~^
/in/foo.cc:25:7: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i==c&&j==b) break;
      ~^~~
/in/foo.cc:25:13: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i==c&&j==b) break;
            ~^~~