/in/foo.cc: In function 'void read(int&)':
/in/foo.cc:30:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(s=='-') f=-1;s=getchar();
         ^~
/in/foo.cc:30:25: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if(s=='-') f=-1;s=getchar();
                         ^
/in/foo.cc: In function 'void run(int, int)':
/in/foo.cc:59:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     if(j=sh[u]){//如果j是深度为2的儿子
               ^
/in/foo.cc: In function 'bool control(ll)':
/in/foo.cc:96:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j=0;j<arv[i].size();j++){
                         ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:3:19: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define go(i,a,b) for(int i=(a);i<=(b);++(i))
                   ^
/in/foo.cc:127:5: note: in expansion of macro 'go'
     go(i,1,m) read(st[i]);vis[1]=1;
     ^~
/in/foo.cc:127:27: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     go(i,1,m) read(st[i]);vis[1]=1;
                           ^~~