foo.cc: In function 'int main()':
foo.cc:12:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |         cin >> a+1 >> b+1;
      |                ~^~
foo.cc:12:24: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |         cin >> a+1 >> b+1;
      |                       ~^~

[Hydro](https://hydro.ac)提供评测服务