/in/foo.cc: In function 'int dfs(int, int)':
/in/foo.cc:50:39: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if (mi=dfs(v,min(e[i].dis,mn-used))){
                                       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:79:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if (ma[i][j]=ss[j]-'0')
                          ^