Compilare: user.cpp: In function ‘int main()’: user.cpp:45:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i]=dp[lastpos[s[0]]]+1; ^ user.cpp:46:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] lastpos[s.back()]=i; ^ user.cpp:38:11: warning: unused variable ‘c’ [-Wunused-variable] int n,c,x,i,k,res=0,j; ^ user.cpp:38:13: warning: unused variable ‘x’ [-Wunused-variable] int n,c,x,i,k,res=0,j; ^