/in/foo.cc: In function 'int main()':
/in/foo.cc:11:12: warning: array subscript is above array bounds [-Warray-bounds]
   a[3]+=a[2];
            ^
/in/foo.cc:11:7: warning: array subscript is above array bounds [-Warray-bounds]
   a[3]+=a[2];
   ~~~~^~~~~~
/in/foo.cc:15:12: warning: array subscript is above array bounds [-Warray-bounds]
   b[3]+=b[2];
            ^
/in/foo.cc:15:7: warning: array subscript is above array bounds [-Warray-bounds]
   b[3]+=b[2];
   ~~~~^~~~~~
/in/foo.cc:19:12: warning: array subscript is above array bounds [-Warray-bounds]
   c[3]+=c[2];
            ^
/in/foo.cc:19:7: warning: array subscript is above array bounds [-Warray-bounds]
   c[3]+=c[2];
   ~~~~^~~~~~
/in/foo.cc:21:8: warning: array subscript is above array bounds [-Warray-bounds]
  if(a[3]<=b[3]&&a[3]<=c[3])cout<<a[3]<<endl;
     ~~~^
/in/foo.cc:21:14: warning: array subscript is above array bounds [-Warray-bounds]
  if(a[3]<=b[3]&&a[3]<=c[3])cout<<a[3]<<endl;
           ~~~^
/in/foo.cc:21:26: warning: array subscript is above array bounds [-Warray-bounds]
  if(a[3]<=b[3]&&a[3]<=c[3])cout<<a[3]<<endl;
                       ~~~^
/in/foo.cc:22:8: warning: array subscript is above array bounds [-Warray-bounds]
  if(b[3]<=a[3]&&b[3]<=c[3])cout<<b[3]<<endl;
     ~~~^
/in/foo.cc:22:14: warning: array subscript is above array bounds [-Warray-bounds]
  if(b[3]<=a[3]&&b[3]<=c[3])cout<<b[3]<<endl;
           ~~~^
/in/foo.cc:22:26: warning: array subscript is above array bounds [-Warray-bounds]
  if(b[3]<=a[3]&&b[3]<=c[3])cout<<b[3]<<endl;
                       ~~~^
/in/foo.cc:23:8: warning: array subscript is above array bounds [-Warray-bounds]
  if(c[3]<=b[3]&&c[3]<=a[3])cout<<c[3]<<endl;
     ~~~^
/in/foo.cc:23:14: warning: array subscript is above array bounds [-Warray-bounds]
  if(c[3]<=b[3]&&c[3]<=a[3])cout<<c[3]<<endl;
           ~~~^
/in/foo.cc:23:26: warning: array subscript is above array bounds [-Warray-bounds]
  if(c[3]<=b[3]&&c[3]<=a[3])cout<<c[3]<<endl;
                       ~~~^