View Compilation Error

0_0_34142773_21998.cpp:13:4: error: stray '\' in program
    printf(%lld\n",(long long)(2*a[n]));
    ^
0_0_34142773_21998.cpp:13:4: error: missing terminating " character
0_0_34142773_21998.cpp: In function 'int main()':
0_0_34142773_21998.cpp:13:11: error: expected primary-expression before '%' token
    printf(%lld\n",(long long)(2*a[n]));
           ^
0_0_34142773_21998.cpp:13:12: error: 'lld' was not declared in this scope
    printf(%lld\n",(long long)(2*a[n]));
            ^