/in/foo.cc: In function 'void merge(int, int, int)':
/in/foo.cc:9:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(a[i]>a[j]||a[i]==a[j]&&a2[i]<a2[j])
      |                               ~~~~~~~~~~^~~~~~~~~~~~~