foo.cc: In function 'int main()':
foo.cc:19:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   19 |                         if(a[i]<0&&a[j]>0 || a[i]>0&&a[j]<0)
      |                            ~~~~~~^~~~~~~~
foo.cc:38:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   38 |                 printf("%I64d\n",maxsum);
      |                         ~~~~^    ~~~~~~
      |                             |    |
      |                             int  long long int
      |                         %I64lld

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