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View Compilation Error

In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_30417473_29483.cpp:3:
0_0_30417473_29483.cpp:5:56: error: declaration of 'long long int __builtin_nan' conflicts with built-in declaration 'double __builtin_nan(const char*)'
 long long t,i,factorial[2001]={1},IE[2001],n,j,a[1001],NAN,k,NA[1001],l,f[1001][1001]={1},answer;
                                                        ^
0_0_30417473_29483.cpp:5:56: error: 'long long int __builtin_nan' conflicts with a previous declaration
<built-in>: note: previous declaration 'double __builtin_nan(const char*)'
0_0_30417473_29483.cpp:5:56: error: invalid conversion from 'const char*' to 'long long int' [-fpermissive]
 long long t,i,factorial[2001]={1},IE[2001],n,j,a[1001],NAN,k,NA[1001],l,f[1001][1001]={1},answer;
                                                        ^
0_0_30417473_29483.cpp: In function 'int main()':
0_0_30417473_29483.cpp:34:6: error: lvalue required as left operand of assignment
   NAN=0;
      ^
0_0_30417473_29483.cpp:38:7: error: lvalue required as increment operand
    NAN++;
       ^
0_0_30417473_29483.cpp:39:10: error: invalid types 'long long int [1001][double]' for array subscript
    NA[NAN]=k-j;
          ^
0_0_30417473_29483.cpp:43:35: error: invalid types 'long long int [1001][double]' for array subscript
   for (l=0,f[j][k]=0;2*l<=k+NA[NAN];l++)
                                   ^
0_0_30417473_29483.cpp:44:27: error: invalid types 'long long int [1001][double]' for array subscript
   f[j][k]+=f[j-1][k+NA[NAN]-l-l]*C(NA[NAN],l)*C(k+NA[NAN]-l-l,NA[NAN]-l);
                           ^
0_0_30417473_29483.cpp:44:42: error: invalid types 'long long int [1001][double]' for array subscript
   f[j][k]+=f[j-1][k+NA[NAN]-l-l]*C(NA[NAN],l)*C(k+NA[NAN]-l-l,NA[NAN]-l);
                                          ^
0_0_30417473_29483.cpp:44:57: error: invalid types 'long long int [1001][double]' for array subscript
   f[j][k]+=f[j-1][k+NA[NAN]-l-l]*C(NA[NAN],l)*C(k+NA[NAN]-l-l,NA[NAN]-l);
                                                         ^
0_0_30417473_29483.cpp:44:69: error: invalid types 'long long int [1001][double]' for array subscript
   f[j][k]+=f[j-1][k+NA[NAN]-l-l]*C(NA[NAN],l)*C(k+NA[NAN]-l-l,NA[NAN]-l);
                                                                     ^
0_0_30417473_29483.cpp:47:16: error: invalid types 'long long int [1001][1001][double]' for array subscript
   answer+=f[NAN][j];
                ^


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