View Compilation Error

0_0_32545310_20167.cpp: In function 'void init()':
0_0_32545310_20167.cpp:18:9: error: 'i' was not declared in this scope
     for(i=1;i<=n;i++){
         ^
0_0_32545310_20167.cpp: In function 'void merge(int, int)':
0_0_32545310_20167.cpp:35:3: error: 'aa' was not declared in this scope
   aa[p]+=aa[q];
   ^