/in/foo.cc: In function 'int main()':
/in/foo.cc:29:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(c[j]<c[i] && d[j]<d[i] || c[j]>c[i] && d[j]>d[i])
       ~~~~~~~~~~^~~~~~~~~~~~