foo.cc: In function 'void plus_(int, int)':
foo.cc:23:5: warning: array subscript 4 is above array bounds of 'int [4]' [-Warray-bounds]
   23 |  l[4]=len;
      |  ~~~^
foo.cc:5:5: note: while referencing 'l'
    5 | int l[4];
      |     ^
foo.cc: In function 'void plus_one(int, int)':
foo.cc:43:5: warning: array subscript 4 is above array bounds of 'int [4]' [-Warray-bounds]
   43 |  l[4]=len;
      |  ~~~^
foo.cc:5:5: note: while referencing 'l'
    5 | int l[4];
      |     ^
foo.cc: In function 'void copy(int)':
foo.cc:47:20: warning: array subscript 4 is above array bounds of 'int [4]' [-Warray-bounds]
   47 |  for(int i=1;i<=l[4];i++)
      |                 ~~~^
foo.cc:5:5: note: while referencing 'l'
    5 | int l[4];
      |     ^
foo.cc:50:5: warning: array subscript 4 is above array bounds of 'int [4]' [-Warray-bounds]
   50 |  l[4]=0;
      |  ~~~^
foo.cc:5:5: note: while referencing 'l'
    5 | int l[4];
      |     ^

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