View Compilation Error

0_0_35792714_25713.cpp: In function 'void solve()':
0_0_35792714_25713.cpp:67:20: error: 'i' does not name a type
      for(register  i = 1; i <= l; i++){
                    ^
0_0_35792714_25713.cpp:67:27: error: expected ';' before 'i'
      for(register  i = 1; i <= l; i++){
                           ^
0_0_35792714_25713.cpp:67:27: error: 'i' was not declared in this scope