View Compilation Error

0_0_32325747_14154.cpp:7:14: error: 'q' was not declared in this scope
 int sum=rand(q, 10000000);
              ^
0_0_32325747_14154.cpp:8:1: error: expected unqualified-id before 'for'
 for(int i=1; i<=n; i++) {
 ^
0_0_32325747_14154.cpp:8:14: error: 'i' does not name a type
 for(int i=1; i<=n; i++) {
              ^
0_0_32325747_14154.cpp:8:20: error: 'i' does not name a type
 for(int i=1; i<=n; i++) {
                    ^
0_0_32325747_14154.cpp:12:1: error: 'a' does not name a type
 a[rand(1, n)]+=sum;
 ^