foo.cc: In function 'int main()':
foo.cc:31:20: warning: array subscript 2 is above array bounds of 'int [2]' [-Warray-bounds]
   31 |                 f[2] = i_2 % j;
      |                 ~~~^
foo.cc:7:5: note: while referencing 'f'
    7 | int f[2] = { 0 };//保留每一阶段的余数
      |     ^

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