foo.cc: In function 'void dfs(int, double)':
foo.cc:31:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   31 |             if(mark)
      |             ^~
foo.cc:33:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   33 |    dfs(step+1,dd[i]*1.0-sum);
      |    ^~~
foo.cc: In function 'int main()':
foo.cc:70:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   70 |          scanf("%s",num[i]);
      |          ~~~~~^~~~~~~~~~~~~

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