Compilare: user.cpp: In function ‘int main()’: user.cpp:34:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a.length(); i++){ ^ user.cpp:30:9: warning: unused variable ‘maxLength’ [-Wunused-variable] int maxLength = INT_MIN, startIndex = 0, n; ^ user.cpp:30:46: warning: unused variable ‘n’ [-Wunused-variable] int maxLength = INT_MIN, startIndex = 0, n; ^