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View Compilation Error

0_0_14947933_26943.cpp:5:7: error: 'maxn' was not declared in this scope
 int l[maxn] , r[maxn] ;
       ^
0_0_14947933_26943.cpp:5:17: error: 'maxn' was not declared in this scope
 int l[maxn] , r[maxn] ;
                 ^
0_0_14947933_26943.cpp: In function 'int main()':
0_0_14947933_26943.cpp:13:57: error: 'l' was not declared in this scope
         for( int i = 1 ; i <= n ; i++ ) scanf( "%d%d" , l+i , r+i ) ;
                                                         ^
0_0_14947933_26943.cpp:13:63: error: 'r' was not declared in this scope
         for( int i = 1 ; i <= n ; i++ ) scanf( "%d%d" , l+i , r+i ) ;
                                                               ^
0_0_14947933_26943.cpp:17:23: error: 'l' was not declared in this scope
             ans += B*(l[i]-r[i-1])-A*(r[i]-l[i]) ;
                       ^
0_0_14947933_26943.cpp:17:28: error: 'r' was not declared in this scope
             ans += B*(l[i]-r[i-1])-A*(r[i]-l[i]) ;
                            ^
0_0_14947933_26943.cpp:18:35: error: 'max' was not declared in this scope
             sum = max( sum , -ans ) ;
                                   ^
0_0_14947933_26943.cpp:18:35: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_14947933_26943.cpp:2:
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)
     ^


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