View Compilation Error

0_0_28150118_1847.cpp: In function 'void search(int, int, ll)':
0_0_28150118_1847.cpp:53:7: error: 'i' was not declared in this scope
  if(a[i])merge(v,num[x]);
       ^
0_0_28150118_1847.cpp: In function 'void solve(int, int)':
0_0_28150118_1847.cpp:75:7: error: 'i' was not declared in this scope
  if(a[i]){
       ^