View Compilation Error

0_0_29766614_16804.cpp:3:21: error: lvalue required as increment operand
 const int MAXN = 2e3++5;
                     ^
0_0_29766614_16804.cpp:5:13: error: size of array 'pre' is not an integral constant-expression
 int pre[MAXN];
             ^
0_0_29766614_16804.cpp:6:13: error: size of array 'ran' is not an integral constant-expression
 int ran[MAXN];  ///0表示同性，1表示异性
             ^