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View Compilation Error

0_0_25390918_9318.cpp: In function 'int main()':
0_0_25390918_9318.cpp:14:5: error: 'vector' was not declared in this scope
     vector<int> v(n, -1);
     ^
0_0_25390918_9318.cpp:14:5: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:64:0,
                 from 0_0_25390918_9318.cpp:2:
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_25390918_9318.cpp:14:12: error: expected primary-expression before 'int'
     vector<int> v(n, -1);
            ^
0_0_25390918_9318.cpp:15:33: error: 'v' was not declared in this scope
     for (int i = 0; i < n; ++i) v[i] = i;
                                 ^
0_0_25390918_9318.cpp:20:7: error: 'v' was not declared in this scope
       v[l - 1] = max(v[l - 1], r - 1);
       ^
0_0_25390918_9318.cpp:20:37: error: 'max' was not declared in this scope
       v[l - 1] = max(v[l - 1], r - 1);
                                     ^
0_0_25390918_9318.cpp:20:37: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_25390918_9318.cpp:3:
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_25390918_9318.cpp:22:5: error: 'set' was not declared in this scope
     set<int> unused;
     ^
0_0_25390918_9318.cpp:22:5: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from 0_0_25390918_9318.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:90:11: note:   'std::set'
     class set
           ^
0_0_25390918_9318.cpp:22:9: error: expected primary-expression before 'int'
     set<int> unused;
         ^
0_0_25390918_9318.cpp:24:7: error: 'unused' was not declared in this scope
       unused.insert(i);
       ^
0_0_25390918_9318.cpp:25:11: error: expected primary-expression before 'int'
    vector<int> ret(n);
           ^
0_0_25390918_9318.cpp:29:16: error: 'v' was not declared in this scope
       if (r >= v[i]) continue;
                ^
0_0_25390918_9318.cpp:31:9: error: 'unused' was not declared in this scope
         unused.insert(ret[l++]);
         ^
0_0_25390918_9318.cpp:31:23: error: 'ret' was not declared in this scope
         unused.insert(ret[l++]);
                       ^
0_0_25390918_9318.cpp:32:18: error: 'v' was not declared in this scope
       while (r < v[i]) 
                  ^
0_0_25390918_9318.cpp:34:9: error: 'ret' was not declared in this scope
         ret[++r] = *unused.begin();
         ^
0_0_25390918_9318.cpp:34:21: error: 'unused' was not declared in this scope
         ret[++r] = *unused.begin();
                     ^
0_0_25390918_9318.cpp:41:20: error: 'ret' was not declared in this scope
       printf("%d", ret[i]);
                    ^


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