View Compilation Error

0_0_32571824_3528.cpp:39:1: error: missing terminating ' character
 constexpr int mod = 1'000'000'007;
 ^
0_0_32571824_3528.cpp:39:22: error: expected ',' or ';' before '\x303030'
 constexpr int mod = 1'000'000'007;
                      ^
0_0_32571824_3528.cpp: In function 'int main()':
0_0_32571824_3528.cpp:50:26: error: 'a' was not declared in this scope
             scanf("%d", &a[i]);
                          ^