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View Compilation Error

0_0_31701561_13797.cpp:3:1: error: 'string' does not name a type
 string a;
 ^
0_0_31701561_13797.cpp: In function 'int main()':
0_0_31701561_13797.cpp:7:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^
0_0_31701561_13797.cpp:7:2: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_31701561_13797.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_31701561_13797.cpp:10:8: error: 'a' was not declared in this scope
   cin>>a;
        ^
0_0_31701561_13797.cpp:19:43: error: 'min' was not declared in this scope
     dp[i][0]=min(dp[i-1][0]+2,dp[i-1][1]+2);
                                           ^
0_0_31701561_13797.cpp:19:43: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_31701561_13797.cpp:1:
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_31701561_13797.cpp:24:43: error: 'min' was not declared in this scope
     dp[i][0]=min(dp[i-1][0]+1,dp[i-1][1]+2);
                                           ^
0_0_31701561_13797.cpp:24:43: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_31701561_13797.cpp:1:
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_31701561_13797.cpp:28:44: error: 'min' was not declared in this scope
   printf("%d\n",min(dp[len][0],dp[len][1]+1));
                                            ^
0_0_31701561_13797.cpp:28:44: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_31701561_13797.cpp:1:
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)
     ^


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