foo.cc: In function 'int main()':
foo.cc:10:14: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
         a[i] = i;
         ~~~~~^~~
foo.cc:8:16: note: within this loop
     for (i=1; i<=10; i++)      //为三个数组赋值1-9
               ~^~~~

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