Compilare: user.cpp: In function ‘long long int lcp()’: user.cpp:22:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k; ^ user.cpp:22:12: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:40:6: warning: unused variable ‘n’ [-Wunused-variable] int n, i, j, c; ^ user.cpp:40:9: warning: unused variable ‘i’ [-Wunused-variable] int n, i, j, c; ^ user.cpp:40:12: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, c; ^ user.cpp:41:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prefix2.in","r",stdin); ^ user.cpp:42:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prefix2.out","w",stdout); ^ user.cpp:43:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",str1); ^