View Compilation Error

0_0_26397601_31417.cpp: In function 'int main()':
0_0_26397601_31417.cpp:20:23: error: invalid types 'int[int]' for array subscript
         big[0] = num[0];
                       ^
0_0_26397601_31417.cpp:24:44: error: invalid types 'int[int]' for array subscript
                 big[j] = big[j - 1] + num[j];
                                            ^
0_0_26397601_31417.cpp:27:31: error: invalid types 'int[int]' for array subscript
                 big[j] = num[j];
                               ^
0_0_26397601_31417.cpp:43:39: error: 'sum' was not declared in this scope
         now = 0, maxn = -10000000000, sum = 0, pos1 = 0, pos2 = 0;
                                       ^