/in/foo.cc: In function 'bool check(int)':
/in/foo.cc:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(ddg[u&65535]!=u>>16){
      ~~~~~~~~~~~~^~~~~~~
/in/foo.cc:31:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if((u>>16)>=mid)break;
      ~~~~~~~^~~~~
/in/foo.cc:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(ddg[u&65535]!=u>>16)continue;
      ~~~~~~~~~~~~^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:58:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    const int mid=l+r>>1;
                  ~^~
/in/foo.cc:62:24: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
   printf("%d",q1.size());
                        ^
/in/foo.cc:63:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int i:q1)printf(" %d",i);putchar('\n');
   ^~~
/in/foo.cc:63:32: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   for(int i:q1)printf(" %d",i);putchar('\n');
                                ^~~~~~~
/in/foo.cc:75:24: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
   printf("%d",q1.size());
                        ^
/in/foo.cc:76:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int i:q1)printf(" %d",i);putchar('\n');
   ^~~
/in/foo.cc:76:32: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   for(int i:q1)printf(" %d",i);putchar('\n');
                                ^~~~~~~