foo.cc: In function 'int main()':
foo.cc:21:20: warning: unused variable 'i' [-Wunused-variable]
   21 |         int n = 0, i = 0, x,y,m, t = 1;;
      |                    ^
foo.cc:21:31: warning: 'm' may be used uninitialized [-Wmaybe-uninitialized]
   21 |         int n = 0, i = 0, x,y,m, t = 1;;
      |                               ^

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