/in/foo.cc: In function 'int DFS(int, int)':
/in/foo.cc:63:39: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
           if(a=DFS(i,min(w[x][i],low))){
                                       ^
/in/foo.cc: In function 'void dinic()':
/in/foo.cc:75:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
         while(flow=DFS(s,INF)){
                             ^