/in/foo.cc: In function 'void gengxin()':
/in/foo.cc:17:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for (int j = 1; j <= k && i - a[j] >= 0; j++)
         ^~~
/in/foo.cc:19:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
             if (f[i] > n)
             ^~