/in/foo.cc: In function 'int max_flow(int, int)':
/in/foo.cc:56:47: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if(d=max_flow(e[i].y,min(e[i].v,flow-maxn)))
                                               ^
/in/foo.cc: In function 'int dinic()':
/in/foo.cc:66:25: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   while(d=max_flow(s,INF))
                         ^