foo.cc: In function 'int main()':
foo.cc:12:33: warning: array subscript 51 is above array bounds of 'int [10]' [-Warray-bounds]
   12 |                         a[i][51]+=a[i][j];
      |                         ~~~~~~~~^~~~~~~~~
foo.cc:5:13: note: while referencing 'a'
    5 |         int a[52][10];
      |             ^
foo.cc:12:33: warning: array subscript 51 is above array bounds of 'int [10]' [-Warray-bounds]
   12 |                         a[i][51]+=a[i][j];
      |                         ~~~~~~~~^~~~~~~~~
foo.cc:5:13: note: while referencing 'a'
    5 |         int a[52][10];
      |             ^

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