/in/foo.cc: In function 'int main()':
/in/foo.cc:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (len>strlen(st[i])) continue;
                 ~~~^~~~~~~~~~~~~~
/in/foo.cc:31:16: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout << d(n)<< endl;
                ^
/in/foo.cc: In function 'int d(int)':
/in/foo.cc:39:19: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int i,a=1,b=2,c;
                   ^