/in/foo.cc: In function 'int main()':
/in/foo.cc:21:16: warning: variable 'k' set but not used [-Wunused-but-set-variable]
    int max1=-1,k,l;
                ^
/in/foo.cc:22:8: warning: unused variable 'min1' [-Wunused-variable]
    int min1=10001;
        ^
/in/foo.cc:35:19: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(max1>a[j][l])
                   ^