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View Compilation Error

0_0_17250827_11845.cpp: In function 'int main()':
0_0_17250827_11845.cpp:10:9: error: 'cin' was not declared in this scope
   while(cin >> n >> k){
         ^
0_0_17250827_11845.cpp:12:14: error: 'sort' was not declared in this scope
    sort(a,a+n);
              ^
0_0_17250827_11845.cpp:12:14: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_17250827_11845.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^
0_0_17250827_11845.cpp:16:62: error: 'min' was not declared in this scope
      dp[i][j] = min(dp[i-1][j],dp[i-2][j-1]+SQ(a[i-1]-a[i-2]));     
                                                              ^
0_0_17250827_11845.cpp:16:62: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_17250827_11845.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:3444:5: note:   'std::min'
     min(initializer_list<_Tp> __l, _Compare __comp)
     ^
0_0_17250827_11845.cpp:20:4: error: 'cout' was not declared in this scope
    cout << dp[n][k] << endl;
    ^
0_0_17250827_11845.cpp:20:24: error: 'endl' was not declared in this scope
    cout << dp[n][k] << endl;
                        ^


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