/in/foo.cc: In function 'int main()':
/in/foo.cc:9:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<strlen(a);i++){
             ~^~~~~~~~~~
/in/foo.cc:6:24: warning: unused variable 's' [-Wunused-variable]
     int max=-1,min=101,s=0,i,j,k,f=0;
                        ^
/in/foo.cc:6:30: warning: unused variable 'j' [-Wunused-variable]
     int max=-1,min=101,s=0,i,j,k,f=0;
                              ^