Compilare: user.cpp: In function ‘int main()’: user.cpp:84:9: warning: unused variable ‘sol’ [-Wunused-variable] int sol,aux,i; ^ user.cpp:84:13: warning: unused variable ‘aux’ [-Wunused-variable] int sol,aux,i; ^ user.cpp:84:17: warning: unused variable ‘i’ [-Wunused-variable] int sol,aux,i; ^ user.cpp:85:37: 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:86:39: 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:87:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", (a+1)); ^