View Compilation Error

0_0_37724984_17004.cpp: In function 'void solve()':
0_0_37724984_17004.cpp:38:28: error: redeclaration of 'VI next'
  VI next(s.length()), next(s.length());;
                            ^
0_0_37724984_17004.cpp:38:5: note: 'VI next' previously declared here
  VI next(s.length()), next(s.length());;
     ^