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View Compilation Error

0_0_13503263_9942.cpp:15:17: error: 'st' is not a namespace-name
 using namespace st;
                 ^
0_0_13503263_9942.cpp:15:19: error: expected namespace-name before ';' token
 using namespace st;
                   ^
0_0_13503263_9942.cpp: In function 'int main()':
0_0_13503263_9942.cpp:19:5: error: 'cin' was not declared in this scope
     cin >> T;
     ^
0_0_13503263_9942.cpp:19:5: note: suggested alternative:
In file included from 0_0_13503263_9942.cpp:9:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_13503263_9942.cpp:22:9: error: 'vector' was not declared in this scope
         vector<int> dp(n, 0);
         ^
0_0_13503263_9942.cpp:22:9: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:61,
                 from 0_0_13503263_9942.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:214:11: note:   'std::vector'
     class vector : protected _Vector_base<_Tp, _Alloc>
           ^
0_0_13503263_9942.cpp:22:16: error: expected primary-expression before 'int'
         vector<int> dp(n, 0);
                ^
0_0_13503263_9942.cpp:23:16: error: expected primary-expression before 'int'
         vector<int> dp2(n, 0);
                ^
0_0_13503263_9942.cpp:27:24: error: 'dp' was not declared in this scope
                 cin >> dp[k];
                        ^
0_0_13503263_9942.cpp:29:40: error: 'dp2' was not declared in this scope
                     dp[k] = max(dp[k], dp2[k - 1] + dp[k]);
                                        ^
0_0_13503263_9942.cpp:29:58: error: 'max' was not declared in this scope
                     dp[k] = max(dp[k], dp2[k - 1] + dp[k]);
                                                          ^
0_0_13503263_9942.cpp:29:58: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_13503263_9942.cpp:13:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3454:5: note:   'std::max'
     max(initializer_list<_Tp> __l, _Compare __comp)
     ^
0_0_13503263_9942.cpp:30:36: error: 'dp2' was not declared in this scope
                 dp[k] = max(dp[k], dp2[k] + dp[k]);
                                    ^
0_0_13503263_9942.cpp:30:50: error: 'max' was not declared in this scope
                 dp[k] = max(dp[k], dp2[k] + dp[k]);
                                                  ^
0_0_13503263_9942.cpp:30:50: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_13503263_9942.cpp:13:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3454:5: note:   'std::max'
     max(initializer_list<_Tp> __l, _Compare __comp)
     ^
0_0_13503263_9942.cpp:32:18: error: 'dp' was not declared in this scope
             swap(dp, dp2);
                  ^
0_0_13503263_9942.cpp:32:22: error: 'dp2' was not declared in this scope
             swap(dp, dp2);
                      ^
0_0_13503263_9942.cpp:32:25: error: 'swap' was not declared in this scope
             swap(dp, dp2);
                         ^
0_0_13503263_9942.cpp:32:25: note: suggested alternatives:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from 0_0_13503263_9942.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:294:5: note:   'std::swap'
     swap(stack<_Tp, _Seq>& __x, stack<_Tp, _Seq>& __y)
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/exception:162:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/new:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/new_allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/c++allocator.h:33,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/allocator.h:46,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:62,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60,
                 from 0_0_13503263_9942.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/exception_ptr.h:160:5: note:   'std::__exception_ptr::swap'
     swap(exception_ptr& __lhs, exception_ptr& __rhs)
     ^
0_0_13503263_9942.cpp:34:9: error: 'cout' was not declared in this scope
         cout << dp2[n - 1] << endl;
         ^
0_0_13503263_9942.cpp:34:9: note: suggested alternative:
In file included from 0_0_13503263_9942.cpp:9:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_13503263_9942.cpp:34:17: error: 'dp2' was not declared in this scope
         cout << dp2[n - 1] << endl;
                 ^
0_0_13503263_9942.cpp:34:31: error: 'endl' was not declared in this scope
         cout << dp2[n - 1] << endl;
                               ^
0_0_13503263_9942.cpp:34:31: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_13503263_9942.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^


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