/in/foo.cc: In function 'int dfs(int, int)':
/in/foo.cc:34:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(x==n) return flow;int k;
  ^~
/in/foo.cc:34:23: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(x==n) return flow;int k;
                       ^~~
/in/foo.cc:39:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(k=dfs(u,min(w[i],flow)))
                             ^