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View Compilation Error

0_0_30790130_23353.cpp: In function 'int main()':
0_0_30790130_23353.cpp:24:34: error: wrong number of template arguments (0, should be 1)
         set<pair<int,int>,greater<>>s;
                                  ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:48:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_30790130_23353.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:358:12: error: provided for 'template<class _Tp> struct std::greater'
     struct greater : public binary_function<_Tp, _Tp, bool>
            ^
0_0_30790130_23353.cpp:24:35: error: template argument 2 is invalid
         set<pair<int,int>,greater<>>s;
                                   ^
0_0_30790130_23353.cpp:24:38: error: invalid type in declaration before ';' token
         set<pair<int,int>,greater<>>s;
                                      ^
0_0_30790130_23353.cpp:27:15: error: request for member 'insert' in 's', which is of non-class type 'int'
             s.insert({p[i],i});
               ^
0_0_30790130_23353.cpp:33:19: error: request for member 'empty' in 's', which is of non-class type 'int'
         while (!s.empty())
                   ^
0_0_30790130_23353.cpp:35:32: error: request for member 'begin' in 's', which is of non-class type 'int'
             pair<int,int>pp=*s.begin();
                                ^
0_0_30790130_23353.cpp:41:23: error: request for member 'insert' in 's', which is of non-class type 'int'
                     s.insert({p[pp.second/2],pp.second/2});
                       ^
0_0_30790130_23353.cpp:45:23: error: request for member 'insert' in 's', which is of non-class type 'int'
                     s.insert({p[pp.second/2],pp.second/2});
                       ^
0_0_30790130_23353.cpp:48:15: error: request for member 'erase' in 's', which is of non-class type 'int'
             s.erase(pp);
               ^


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