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View Compilation Error

0_0_36618604_22972.cpp:14:52: error: wrong number of template arguments (0, should be 1)
 std::priority_queue<ll, std::vector<ll>, std::less<> > heap;
                                                    ^
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_36618604_22972.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_function.h:367:12: error: provided for 'template<class _Tp> struct std::less'
     struct less : public binary_function<_Tp, _Tp, bool>
            ^
0_0_36618604_22972.cpp:14:54: error: template argument 3 is invalid
 std::priority_queue<ll, std::vector<ll>, std::less<> > heap;
                                                      ^
0_0_36618604_22972.cpp:14:60: error: invalid type in declaration before ';' token
 std::priority_queue<ll, std::vector<ll>, std::less<> > heap;
                                                            ^
0_0_36618604_22972.cpp: In function 'int main()':
0_0_36618604_22972.cpp:36:31: error: request for member 'push' in 'heap', which is of non-class type 'int'
             if(a[i] < s) heap.push(a[i]);
                               ^
0_0_36618604_22972.cpp:40:22: error: request for member 'push' in 'heap', which is of non-class type 'int'
                 heap.push(a[i] % s);
                      ^
0_0_36618604_22972.cpp:48:18: error: request for member 'pop' in 'heap', which is of non-class type 'int'
             heap.pop();
                  ^
0_0_36618604_22972.cpp:51:21: error: request for member 'empty' in 'heap', which is of non-class type 'int'
         while(!heap.empty())
                     ^
0_0_36618604_22972.cpp:53:25: error: request for member 'top' in 'heap', which is of non-class type 'int'
             ans += heap.top();
                         ^
0_0_36618604_22972.cpp:54:18: error: request for member 'pop' in 'heap', which is of non-class type 'int'
             heap.pop();
                  ^


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