View Compilation Error

0_0_15370238_3638.cpp: In function 'void solve()':
0_0_15370238_3638.cpp:13:12: error: 'a' was not declared in this scope
         if(a[i] > n){
            ^
0_0_15370238_3638.cpp: In function 'void init()':
0_0_15370238_3638.cpp:42:5: error: 'a' was not declared in this scope
     a[1] = 2;
     ^